PROC. ENTOMOL. SOC. WASH. 93(3), 1991, pp. 703-708 CLASSIFICATION OF HOMALOCORIS (HETEROPTERA: REDUVIIDAE: HAMMACERINAE), WITH THE DESCRIPTION OF A NEW SPECIES J. Maldonado Capriles and J. A. Santiago-Blay (JMC) Department ofCrop Protection, College ofAgricultural Sciences, University of Puerto Rico, Mayaguez, Puerto Rico 00709-5000; (JASB) Department ofEntomological Sciences, University ofCalifornia, Berkeley, California 94720-0001. Abstract.—Homalocoris erythrogastern. sp. is described from Arizona, USA, and a key to the species is presented. Initial studies suggest that the species ofHomalocoris can be separated into two groups based on scutellar and corium setal morphology. Key Words: Reduviidae, Hammacerinae, Homalocoris, H. erythrogaster n. sp., key The neotropical subfamily Hammaceri- 2-pronged scutellum. In some species the nae (= Microtominae) is characterized by a prongs ofthe scutellum are closer than the unique antenna: the first segment is short basalthicknessofaprongandinothersthey and stout and the second elongate, flexible, areapartbymorethan theirbasalthickness. and slender. The second segment is subdi- Theholotypeofthenewspeciesdescribed vided into 23-28 pseudo- or subsegments below is deposited in the Department of inHammatocerusand 8-18 inHomalocoris Entomological SciencesoftheUniversityof (Fig. 1), the only genera in the subfamily. California at Berkeley. The hairy body is flattened, very granulose, Methods and Description theheadhasaveryshortposteriorlobe, and ventral segments 2-5 are broadly depressed Homalocoriserythrogastern. sp.,H. mac- and sulcate medially. ulicollis, H. minutus, and H. varius were The subfamily includes somber colored studied with an IDS-DS 130 scanning elec- speciesornamentedwithred, orangeorgray. tron microscopeatthe Electron Microscopy The smallest species in Hammatocerus is Laboratory, University of California at over 13.0 mm, longer than the longest spe- Berkeley. In the description given below cies in Homalocoris that is 12.3 mm long. measurements are in mm. Because in both genera the male and es- Homalocoris erythrogaster New Species, pecially the remarkable female genitalia are Maldonado and Santiago-BIay of a similar type they can not be used to separate the genera. Hammatocerus in- Figs. 2-9 cludes 12 species that were keyed by Costa Male.—Headblackish; eyes black, anten- Lima (1935: 321) as Microtomus. na brown; rostrum reddish brown, last seg- The first couplet in the key published by mentpaler. Pronotum:anteriorlobereddish Maldonado(1987:253)statedinerror"apex brown, posterior lobe black, with 1 + 1 ofscutellum 2-pronged" and "apex ofscu- elongate orange areas along its length (Fig. tellum 1-pronged." SEM studies done by us 2); pronotum laterallyand pleurae blackish. demonstrate that all species have a Scutellum black. Legs: coxaebrownish, hind . 704 PROCEEDINGSOFTHE ENTOMOLOGICALSOCIETY OFWASHINGTON jugae slightly extending beyond apex ofty- lus; from interocular sulcus to apex ofju- gum 1.2, from interocular sulcus to base of head 0.75. Eyes hemispherical, relatively small, not reaching undersurface of head, height 0.8. Length ofantennal segments: I, 0.62; II, 3.9-4.0; III, 1.5; IV, 1.2; II segment with nine pseudosegments; first three seg- ments with moderately abundant long pi- losity, IV with 2 or 3 setae. Rostrum: I, 2.0; II, 1.6(ventral length); III, 1.3; reachingsul- cus of xyphus, upcurved; second segment slightly swollen on apical %, trapezoidal on Fig. L L Homalocarismaculicollisantenna!pseu- lateral aspect; III glabrous. Pronotum: col- dosegments, inset 5x lar very short, partially hidden by pilosity, polished,width 1.2, length0.1;anteriorlobe: greatest width 1.8, length 1.1, setigerous coxa paler; femora reddish brown above, spines arranged in concentric semicircles; brownish below; upper surface of first two posterior lobe densely covered with setig- pairoflegsatabout middle third irregularly erous granules; posterior margin roundly brownish, in the hind femur ofsome para- convex to before humeral angles (Fig. 2); typesthe brownish ofthe undersideextends humeral angles round, slightly produced dorsally, thus making the segment paler. caudad. Scutellum: granulose, wider than First and second tibiae reddish brown, with long (1.7:1.1), apex two-pronged, prongs two brownish or dark orange-annuli; hind straight, apart at slightly more than their tibia reddish brown, with a short basal and basal thickness (Fig. 8); lateral margins car- apical annulus. Connexival segments above inate. Legs: segments straight; fore femora and below dark orange with apical third the thickest (0.8), second femora slightly black except on first where the apical half swollen (0.7); third narrow basally, cylin- is black. Hemelytra: basal angle, including drical; first and second ventrally, especially basal half of clavus, orange red or orange toward base, densely covered with sensory (Fig. 2); from level ofapex ofscutellum re- setae in addition to the less abundant setig- maining part of wing black; small cream- erous granules. Femora anteriorly and pos- white spots at apex ofclavus and at basal teriorly with a preapical short ventral series vein of outer membranal cell and, thus, of blunt teeth, these increasing in size to- wingsatrestappearwiththreesmallwhitish wardapex (Fig. 3). Anteriorand middletib- spots. Thoracic and abdominal sterna or- iae with a small spongy fossa on the surface ange red. Head above and below and pro- of truncate apex, fossa slightly surpassing notum with abundant, moderately large se- apexofsegment. Lengthofsegments.—Fore tigerous granules, the setae 4 or 5 times leg: coxa 0.6, trochanter ventrally 0.7, fe- longerthan the small conical granule, semi- mur 2.9, tibia 2.6, tarsus 0.8, segments sub- vertical; pilosity on connexival margin al- equal in length; middle leg: coxa 0.8, tro- most horizontal, on abdominal sterna at chanter 0.7, femur 2.7, tibia 2.7, tarsus 1.0; about 30°, onclavusandcoriumdecumbent. hindleg:coxa0.7,trochanter0.8, femur4.2, Pilosity black, on scutellum creamy-white. tibia 3.6, tarsus 1.3, third segment the lon- Head: Length 1.7 to apex of neck, neck gest (0.55). Clawssimple. Fore wings reach- 0.2, width acrosseyes 2.0, interocular space ingapexofabdomen, connexivumexposed, 0.9,interocularsulcusatmid-lengthofeyes; setae of setigerous granules along veins of , VOLUME 93, NUMBER 3 705 Figs. 2-7. Homalocoris erythrogaster, male. 2, pronotum and basal half of hemelytra (dorsal view). 3, armature ofprofemur (lateral view). 4, genital capsule (dorsal view). 5, same (lateral view). 6, same (caudal view). 7, female genitalia (dorsal view). corium barbed (Fig. 9). Sterna transversely Female.—Colorationasin male. Anterior corrugate, maximumwidthofabdomen4.5- lobe ofpronotum reddish brown, abdomi- 4.7. Externalgenitaliaasin Figs. 4-6. Length nal sterna vary from orangeredto brownish 12.0 mm, average length 12.05 mm, range red. Head: length 1.4, width acrosseyes 2.1 11.9-12.2 mm. interocular space 1.0, from interocular sul- 706 PROCEEDINGS OFTHE ENTOMOLOGICALSOCIETY OFWASHINGTON .1^-yj^m 15KU 81 12oN 4803 10KU 418X 23. 9H 4796 Figs. 8-11. Figs. 8-9. Homalocoriserythrogaster, female. 8,apexofscutellum. 9,barbedsetigerousgranules on R. Figs. 10-11. Homalocoris minutus, male. 10, apex ofscutellum. 11, barbed setigerousgranuleson R. cus to apex ofjugum 1.1, from interocular Francisco, CA. Paratypes: nine with same sulcustobaseofhead0.9. Pronotum: length data as forholotype, two inJMCcollection, of anterior lobe 1.2, greatest width of an- others at UCB;Wone paratype labeled SW terior lobe 2.0, length ofposterior lobe 1.8, Res. Sta., 5 mi Portal, CochiseCo., Ariz., greatest width ofposterior lobe 3.5. Hemel- VII.15.59, E. G. Lindsley collector. ytrareachingtoaboutbasal fourthofgenital Homalocoris erythrogaster can be sepa- segment. Abdominal sterna not corrugate; rated from its congeners by the characters greatest width ofabdomen 3.4. Genitalia as in the key. The elongate reddish spots on in Fig. 7. Average length 13.4 mm, range the posterior lobe ofthe pronotum are dis- 12.9 to 13.6 mm. tinctive. — SW Holotype. Male, Research Station, Discussion Chiruchua Mts., Arizona, VIII. 1.58, ex Fi- nns chihuahuana, E. G. Lindsley collector. SEM studies confirmed Maldonado's University ofCalifornia, Berkeley, Depart- (1987) observation that in a particular spe- ment ofEntomological Sciences, on indef- cies one oftwo kinds ofsetigerous granules inite loan to the California Academy ofSci- occur along the veins ofcorium: "barbed" ence, Department of Entomology, San (Figs. 9, 11) or "smooth" setae (Figs. 13, VOLUME 93, NUMBER 3 707 . 708 PROCEEDINGS OFTHE ENTOMOLOGICALSOCIETY OF WASHINGTON 4. Corium flavus or grayish, with black discal femora above with fourwhitegranulations . area 5 H. giittatus(Walker)* - Coriumblack,withstramineousorgrayishar- - Posterior lobe of pronotum with 1 + 1 an- eas 6 terolateral larger reddish spots that extend as 5. Pronotum with 1 + 1 stramineousoval vittae aP-shapedmarginalonganteriorlobe;firstand on posterior lobe only; black vitta on corium secondfemorawith poorlydevelopedorwith- subquadrate; robust, over 14 mm out such granulations H. minutus Mayr* H. binotatusChampion - Pronotum with 1 + 1 stramineous elongate Literature Cited vittaeextended intoboth lobes; black vittaon corium oblong; somewhat delicate, under 12 CostaLima,A.da. 1935. GeneroMicrotomuslUiger, mm H. maculicollisStSl 1807. (Reduviidae: Microtominae). Annais Aca- 6. Posterior lobe ofpronotum with 1 + 1 small demia BrasileiradeSciencias 7(4): 315-322, 1 PI. stramineousspotscontiguoustoanteriormar- MaldonadoCapriles,J. 1987. Homalocohspunctatus gin, laterad of short carina; first and second n. sp. and keyto the species inthegenus. Journal ofAgriculture ofthe University of Puerto Rico * Wedonot have malespecimensofthesetwospe- 71(3): 249-253. Wygodzinsky, P. and S. Lodhi. 1989. Atlas on an- cies.Theycouldbe"forms"ofonespecieseventhough tennal trichobothria on the Pachynomidae and theycanbeseparatedbythecharactersinthekey.They Reduviidae (Heteroptera). Journal of the New sharean identical pattern ofsmallgrayish orstramin- York Entomological Society 97: 371-393. eous spots on the fore wings as follows: one each at basal angles, one each at apex ofclavi, one where the wing margins overlap, and one each about middle of basalmarginofmembrane.BothspeciesoccurinMex- ico.