The Project Gutenberg EBook of New Subspecies of the Rodent Baiomys From Central America, by Robert L. Packard This eBook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included with this eBook or online at www.gutenberg.org Title: New Subspecies of the Rodent Baiomys From Central America University of Kansas Publications, Museum of Natural History Author: Robert L. Packard Release Date: November 9, 2012 [EBook #41327] Language: English Character set encoding: ISO-8859-1 *** START OF THIS PROJECT GUTENBERG EBOOK NEW SUBSPECIES RODENT BAIOMYS *** Produced by Dianna Adair, Chris Curnow, Joseph Cooper and the Online Distributed Proofreading Team at http://www.pgdp.net UNIVERSITY OF KANSAS PUBLICATIONS MUSEUM OF NATURAL HISTORY Volume 9, No. 15, pp. 397-404 December 19, 1958 New Subspecies of the Rodent Baiomys From Central America BY ROBERT L. PACKARD UNIVERSITY OF KANSAS LAWRENCE 1958 UNIVERSITY OF KANSAS PUBLICATIONS, MUSEUM OF NATURAL HISTORY Editors: E. Raymond Hall, Chairman, Henry S. Fitch, Robert W. Wilson Volume 9, No. 15, pp. 397-404 Published December 19, 1958 UNIVERSITY OF KANSAS Lawrence, Kansas PRINTED IN THE STATE PRINTING PLANT TOPEKA, KANSAS 1958 27-5660 New Subspecies of the Rodent Baiomys From Central America BY [Pg 399] ROBERT L. PACKARD The southern pygmy mouse, Baiomys musculus, is known as far north as the Mexican states of Jalisco, Michoacán, south of the Mesa Central, east to central Veracruz (see Hooper, 1952a:90), and south to western Nicaragua (see Goodwin, 1942:161). Previously, two subspecies have been recognized from the southern part of the known range of this species: B. m. nigrescens, blackish mice from Chiapas, México, and Guatemala, and B. m. grisescens, grayish- brown mice from Honduras and western Nicaragua. Study of recently acquired specimens from Guatemala, El Salvador, and Nicaragua reveals two additional subspecies. For the loan of comparative material, I am grateful to the United States National Museum (USNM) and the American Museum of Natural History (AMNH). Unless otherwise indicated, specimens are in the University of Kansas Museum of Natural History. Measurements are as taken by Hooper (1952b:10). Postpalatal length is the distance from the posterior margin of the hard palate to the anterior margin of the foramen magnum. Unless otherwise noted, statistical significance as used in this paper is at the 95 per cent confidence limit or higher. The two heretofore undescribed subspecies are characterized below and may be known as: Baiomys musculus handleyi, new subspecies Type.—Adult female, USNM No. 275604 (Biological Surveys Collection), skin and skull; from Sacapulas, El Quiché, Guatemala; obtained on April 24, 1947, by Charles O. Handley, Jr., original number 991. Distribution.—Known only from the type locality; probably inhabits parts of the east-west drainage of the Río Negro. Diagnosis.—General ground color of upper parts between Wood Brown and Buffy Brown (all capitalized color terms are those of Ridgway, Color Standards and Color Nomenclature, Washington, D. C., 1912), dorsal parts of fore- and hind-feet, and ankles white; in region of median venter, throat, and chin, hairs white to base; in lateral regions hairs Neutral Gray at base; dorsal hairs below tips Avellaneous, Neutral Gray at base; guard hairs black-tipped; tail white below, brownish above; nasals truncate anteriorly; frontalparietal suture forming an obtuse angle with median-parietal suture; alveolar- length of upper molar tooth-row and tail long. Comparisons.—From Baiomys musculus nigrescens (paratypes, from the Valley of Comitán, Chiapas, México), found to the north, B. m. handleyi differs in: color paler dorsally and ventrally; fore- and hind-feet whitish instead of dusky to sooty; hairs in region of facial vibrissae white instead of brown; tail bicolored instead of unicolored; anterior tips of nasals square, not rounded; frontoparietal suture forming obtuse angle with median parietal suture instead of a right angle; tail and alveolar length of upper molar tooth-row significantly larger (see table 1); zygomatic breadth, breadth of braincase, occipitonasal length, least interorbital constriction, and length of rostrum all averaging larger (see table 2). From Baiomys musculus grisescens (paratypes, from Comayabuela, to the south, B. m. handleyi differs in: buff-colored hairs in dorsal and ventral region lacking; fore- and hind-feet white, not flesh- colored with gray overtones; tail bicolored, not unicolored; face paler, lacking buff-brown coloration; anterior tips of nasals squared rather than flaring; tail and upper molar tooth-row significantly longer (see Table 1); hind foot, ear from notch, and rostrum longer; braincase averaging broader (see Table 2). Remarks.—The occurrence of these pale mice in the Río Negro Valley was first noted by Goodwin (1934:39, 40) when he referred specimens from Sacapulas and Chanquejelve, Guatemala, to B. m. musculus. Hooper (op. cit.:92- 94) correctly assigned specimens from the southern coast and eastern part of Chiapas to B. m. nigrescens. The continued assignment of specimens from Sacapulas, Guatemala, to the subspecies musculus produces a hiatus both in the range of B. m. nigrescens and B. m. musculus. Twenty-four specimens, 14 from 1 mi. S Rabinal, and 10 from 1/2 mi. N, 1 mi. E Salama, Guatemala, are intergrades between handleyi and grisescens, but show more resemblance to the latter and, therefore, are referred to that subspecies. To the north, handleyi intergrades with nigrescens. The specimen from Chanquejelve is an intergrade between the two subspecies just mentioned. Osgood suggested (1909:259) that the degree of relative humidity might in some way control color of pelage in this species. Relative humidity and its subsequent effect on other related environmental factors indeed may account for the superficial resemblance of B. m. musculus to B. m. handleyi (although handleyi averages paler throughout than the paratypical series of musculus). Both subspecies inhabit relatively arid country. According to Goodwin (op. cit.:39 and Plate 5, Fig. 1), and Handley (in verbis), the Río Negro Valley in the vicinity of Sacapulas is extremely hot, dry, and rather isolated. Extremes of climate there may exceed those in the arid habitat occupied by B. m. musculus. The resemblance between these two subspecies may result from nearly parallel selective forces that have given rise to two distinct subspecies. B. m. handleyi may have developed in situ. Specimens examined.—Total 49, from the type locality, including the type (12, USNM; 37, AMNH). [Pg 400] [Pg 401] Baiomys musculus pullus, new subspecies Type.—Adult female, skin and skull, University of Kansas Museum of Natural History, No. 71605, from 8 mi. S Condega, Esteli, Nicaragua; obtained on July 15, 1956, by A. A. Alcorn, original No. 4218. Distribution.—West-central Nicaragua, from Matagalpa northwest into the valley of the Río Esteli, east as far as Jinotega. Diagnosis.—Dorsum Fuscus-Black (see remarks), individual dorsal hairs being black-tipped with a subterminal Ochraceous-Buff band, Neutral Gray at base; some hairs on dorsum all black to Neutral Gray at base; hair on sides Neutral Gray tinged with blackish; facial region blackish becoming more buffy ventrally; vibrissae black; tail unicolored Chaetura Black; fore- and hind-feet whitish to dusky- white; mid-ventral region of belly white to as far anteriorly as region of throat, hairs being white to base; in region of anus and throat, hairs white-tipped, Neutral Gray at base; tail long; upper molar tooth-row short as in B. m. nigrescens; zygoma bowed as in B. m. grisescens. Comparisons.—From B. m. grisescens (paratypes from Comayaguela, Honduras), B. m. pullus differs in: dorsal ground-color and tail darker; sides and distal region of belly grayish instead of buffy- brown, thus making white stripe in region of belly distinct; average length of body and tail significantly longer, thus, total length greater; length of hind foot averaging longer (68 per cent confidence limits); alveolar length of upper molar tooth-row significantly shorter; occipitonasal and rostral length averaging longer; zygomatic spread and interorbital region narrower; length of incisive foramina, depth of cranium, postpalatal length, and breadth of braincase all averaging larger (see table 2). From B. m. nigrescens (paratypes from Valley of Comitán), B. m. pullus differs in: dorsal ground- color slightly darker; facial region grayish, not sooty; mid-ventral white stripe present on belly and becoming grayish laterally; tail darker and less hairy, average length significantly longer; body, occipitonasal length of skull, incisive foramina, and postpalatal length averaging smaller; hind foot shorter; zygomatic spread, interorbital region and braincase broader (see table of measurements); cranium deeper. Remarks.—B. m. pullus is the darkest dorsally of any subspecies of this species. Dalquest (1953:156) pointed out that preserved specimens of one of the subspecies of the northern pygmy mouse, Baiomys taylori taylori, tended to fade considerably over a period of four years. Post-mortem changes in color also are apparent in the southern species musculus. For example, the series of specimens from 8 mi. S of Condega, and 9 mi. NNW Esteli, Nicaragua, have faded from near Chaetura Black to the present Fuscous-Black in a period of two years. The most notable change in color came after the first six months of preservation. Allowing for this fading, the several color differences between pullus, nigrescens and grisescens are, nevertheless, distinctive. Table 1.—Analysis of Variation in Adults of Four Subspecies of Baiomys Musculus (measurements in millimeters) Number of adults averaged Total length Length of body Length of tail Length of hind foot Upper molar length (alveolar) Baiomys musculus handleyi, Sacapulas, El Quiché, Guatemala 9 Av 121.44 70.77 50.67 15.33 3.48 Max 128.00 77.00 54.00 16.00 3.60 Min 115.00 66.00 49.00 15.00 3.40 2xStand. error 3.60 3.22 1.26 .44 .05 Baiomys musculus pullus, 8 mi. S Condega, Nicaragua 17 Av 117.29 70.42 47.18 15.47 3.13 Max 121.00 74.00 50.00 17.00 3.20 Min 111.00 66.00 44.00 14.00 3.00 2xStand. error 1.27 1.51 .75 .35 .03 Baiomys musculus grisescens, Comayaguela, Honduras 7 Av 103.71 59.00 44.71 14.57 3.31 Max 118.00 68.00 50.00 15.00 3.40 [Pg 402] Min 97.00 51.00 42.00 13.00 3.20 2xStand. error 5.50 4.16 2.40 .78 .06 Baiomys musculus nigrescens, Valley of Comitán 11 Av 115.00 72.09 42.91 15.31 3.15 Max 120.00 77.00 45.00 16.00 3.40 Min 108.00 69.00 89.00 14.50 2.90 2xStand. error 2.12 1.59 1.0 .23 .10 Geographically, pullus is partly isolated by the Cerros De Villaguaire and the Cerros El Zapotillo to the west and the Cerros De Azaculapa to the north. Certain individuals of a series of specimens, referable to B. m. nigrescens, from 1 mi. NW San Salvador and 1 mi. S Los Planes, El Salvador, are intermediate in coloration between that subspecies and pullus. Three of 28 specimens from El Salvador possess the mid-ventral white stripe. Table 2.—Cranial Measurements (in millimeters) of Adults of Four Subspecies of Baiomys Musculus Table headings: Col A: Occipitonasal length Col B: Zygomatic breadth Col C: Postpalatal length Col D: Least interorbital breadth Col E: Length of incisive foramena Col F: Length of rostrum Col G: Breadth of braincase Col H: Depth of cranium A B C D E F G H Baiomys musculus handleyi, Sacapulas, El Quiché, Guatemala Number of specimens 8 8 8 9 9 9 8 8 Type 275604 ♀ USNM 20.0 10.4 7.3 4.0 4.5 7.3 9.7 7.1 Average 19.6 10.5 6.9 4.0 4.2 7.2 9.8 7.1 Maximum 20.7 11.0 7.4 4.0 4.5 7.7 10.2 7.2 Minimum 18.8 10.2 6.4 3.9 4.0 7.0 9.7 6.8 Baiomys musculus pullus, 8 mi. S Condega, Esteli, Nicaragua Number of specimens 17 17 15 17 17 17 17 17 Type 275605 ♀ KU 19.2 10.2 6.8 3.8 4.3 6.8 9.5 7.0 Average 19.3 10.2 7.0 3.9 4.3 7.0 9.6 7.0 Maximum 19.8 10.6 7.3 4.1 4.6 7.4 10.0 7.3 Minimum 18.9 9.7 6.8 3.8 4.0 6.5 9.3 6.8 Baiomys musculus grisescens, Comayaguela, Guatemala Number of specimens 6 7 7 7 7 6 7 7 Average 19.7 10.5 6.9 3.9 4.1 7.1 9.6 6.9 Maximum 20.3 10.9 7.2 4.1 4.4 7.3 9.9 7.1 Minimum 19.2 10.2 6.7 3.7 3.9 6.8 9.3 6.8 Baiomys musculus nigrescens, Valley of Comitán, Chiapas, México Number of specimens 14 14 13 14 14 14 14 14 Average 19.5 10.1 7.1 3.8 4.4 6.9 9.3 6.9 Maximum 20.3 11.1 7.4 4.0 4.6 7.4 9.6 7.3 [Pg 403] Minimum 19.1 9.8 6.7 3.6 4.2 6.6 9.0 6.7 Albert Alcorn wrote in his itinerary that some of the type series were taken shortly after lunch (I assume this would mean near noon) near a small creek, and that the specimens from 9 mi. NNW Esteli were trapped in wood piles and rock piles about dusk. Specimens examined.—Total (all from Nicaragua) 36 as follows: Esteli: type locality, 22 (including the type); 8 mi. NNW Esteli, 3; 9 mi. NNW Esteli, 8. Jinotega: 1 mi. NW Jinotega, 1; San Rafael Del Norte, 1 AMNH. Matagalpa: Matagalpa, 1 AMNH. LITERATURE CITED DALQUEST, W. W. 1953. Mammals of the Mexican state of San Luis Potosí. Louisiana State Univ. Studies, Biol. Sci. Ser. No. 1:1-229, 1 fig., December 28. GOODWIN, G. G. 1934. Mammals collected by A. W. Anthony in Guatemala, 1924-1928. Bull. Amer. Mus. Nat. Hist., 68:1-60, 5 pls., December 12. HOOPER, E. T. 1952a. Notes on the pygmy mouse (Baiomys), with description of a new subspecies from Mexico. Jour. Mamm., 33:90-97, February 18. 1952b. A systematic review of the harvest mice (Genus Reithrodontomys) of Latin America. Misc. Publ., Mus. Zool., Univ. Mich., 77:1-255, 9 pls., January 16. OSGOOD, W. T. 1909. Revision of the mice of the American Genus Peromyscus. N. Amer. Fauna, 28:1-285, 8 pls., 12 figs., April 17. Transmitted August 25, 1958. Transcriber's Note Variations of spelling as presented in the paper have been retained fuscus; fuscous foramen; foramena comayabuela; comayaguela End of the Project Gutenberg EBook of New Subspecies of the Rodent Baiomys From Central America, by Robert L. Packard *** END OF THIS PROJECT GUTENBERG EBOOK NEW SUBSPECIES RODENT BAIOMYS *** ***** This file should be named 41327-h.htm or 41327-h.zip ***** This and all associated files of various formats will be found in: http://www.gutenberg.org/4/1/3/2/41327/ Produced by Dianna Adair, Chris Curnow, Joseph Cooper and the Online Distributed Proofreading Team at http://www.pgdp.net Updated editions will replace the previous one--the old editions will be renamed. Creating the works from public domain print editions means that no one owns a United States copyright in these works, so the Foundation (and you!) can copy and distribute it in the United States without permission and without paying copyright royalties. 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