I-HE INSECTS AND ARAOHNIDS OFCANADA THE INSECTS AND ARAOHNIDS OF CANADA PART 1O The Soittlebuqs of Canada Homopteta, Cercopidae K. G. Andrew Hamilton Biosystematics Research Institute Ottawa, C)ntario Research Branch Agriculture Canada Publication 1740 1982 Canadian Cataloguing in Publication Data Hamilton, K. G. A. The spittlebugs of Canada (The Insects and arachnids of Canada, ISSN 0706-7313; pt. l0) (Publication ; 1740) Includes bibliographical references and index. l. Spittlebugs. 2. Insects-Canada. I. Canada. Agriculture Canada. Research Branch. II. Title. III. Series. IV. Series: Publication (Canada. Agriculture Canada). English : 1740. QL527.C4H34 595.7'52 C82-097200-2 (OMinister of Supply and Sen'ices Canada 1982 Alailable in Canada through Authorized Bookstore Agents and other bookstores or by mail frorn Canadian Clovernrnent Publishing Oentre Supply and Servirt,s Canada ()ttawa, Canada, KIA 0S9 .12-.12,/1982-l0E Oatalogue No. A Canada: g7.glr ISBN 0-660-11216-9 Orher counrr.ies: g9.55 Price subjer t to change u'ithout noti<.t, The Insects and Arachnids of Canada Part l. Collecting, Preparing, and Preserving Insects, Mites, and Spiders, compiled bv J. E. H. Martin, Biosystematics Research Institute, Ottawa, 1977. Part 2. fhe Bark Beetles of Canada and Alaska (Coleoptera: Scolytidae), by D. E. Bright, Jr., Biosystematics Research Institute, Ottawa, 1976. Part 3. The Aradidae of Canada (Hemiptera: Aradidae), by R. Matsuda, Biosystematics Research Institute, Ottawa, 1977. Part 4. I he Anthocoridae of Canada and Alaska (Heteroptera: Anthocori- dae), by L. A. Kelton, Biosystematics Research Institute, Ottawa, 1978. Part 5. The Crab Spidcrs of Canada and Alaska (Aranceae : Philodromidae and Thomisidae), by C. D. Dondalc and J. H. Redner, Biosystematics Research Institute, Ottan'a, 1978. Part 6. The Mosquitoes of Canada (Diptera: Culicidae), by D. M. Wood, P. T. Dang, and R. A. Ellis, Biosystematics Research Institute, Ottawa, 1979. Partie 7. Genera des Trichoptcres du Canada et des Etats adiacents, par F. Schmid, Institut de recherches biosyst6matiques, Ottawa, 1980. Part 8. The Plant Bugs of the Prairie Provinces of Canada (Heteroptera: Miridae), by L. A. Kelton, Biosystematics Research Institute, Ottawa, i980. Part 9. The Sac Spiders of Canada and Alaska (Araneae: Clubionidae and Anyphaenidae), by C. D. Dondale and J. H. Redner, Biosystematics Rescarch Institute, Ottawa. 1982. hOllli,pl(,({' Ill(' .\k,ld,,\c 'IJIII!l'Lill~, 1'lulrll>/IlI.\ ~Plll/l(UIlII' ,Llllll,U'U,t: adult,. IlJollill,~,'1J:lllliwl'. :111<1 ,pilll, Ill"""'.lIll (.OIl\Il\Ollll1l1j{Wtltl(./rlt'III/.1i(/llldgfln\) Contents Preface 6 Acknowledgments ............. 6 Introduction 7 [.ife history 7 Parasites, predators, and disease ......... ll L,conomics .,.,,.,..........,.... 12 Distribution .................... 13 Stmcture .................,..,... 14 Systematics ..................... 16 Family Cercopidae-Spittlebugs, or froghoppers ,..............., ....... 17 Key to genera of Canadian spittlebugs ........,......,..,, 17 Genus Cla.s/optera Germar ................. 19 Key to Canadian species-groups of Clastoptera .,,................. I9 The proteus-group .......... ............. 20 Key to Canadian species of the proteu.t-group ........,,,.......... 20 The obtusa-group ..,......... ,,,,,,,,,,,, 21 Key to Canadian species of the obtusa-group ..........,.,.,..,,..,. 24 The lineatocolli.s-group ............... 33 Key to Canadian species of the lineatocollis-group .............. 33 Genus Prosapia Fennah ...,.................. 37 Key to Canadian species of Prosapia ....,.,......,. 38 Genus Aphrophora Germar ................... ................. 39 Key to Canadian subgenera of Aphrophora .......,..,,., ........... 40 Aphrophora (Pinimber) Hamilton ............,...... 10 Aphrophora (Peuceptyelu.r) Sahlberg ............... 42 Key to Canadian species of Aphrophora (Peuceptyelus) ........................... 42 Aphrophora (Aphrophora) Germar ................. 44 Key to Canadian species of Aphrophora subgenus Aphrophora ..........,.., 44 Aphrophora (Plesiommata) Provancher ......... 48 Key to Canadian species of Aphrophora subgenus Plesiommata ............. 49 Genus Lepyronia Amyot & Serville ......................... 58 Key to Canadian species of Lepyronia ...,...,...,. 58 Genus Paraphilaenus Vilbaste ...,........ 62 Genus Naophilaenus Haupt ........,....., 63 Genus Philaenarcys Hamrlton ............. .................. 65 Key to Canadian species of Philaenarc!.t .........,...,,.. ............, 65 Genus I'hilaronia Ball ,....................... 69 Key to Canadian species of Philaronia ............ 69 Genus Philaenus Stil .......................... 7l Glossary ,...,..,...,...,.,.,...... 89 References ..................,....93 Index........... .................... 99 Preface It is my hope that this publication will be of interest to the specialist and the amateur alike. To entomologists, it offers the first synthesis of much scattered information on spittlebugs; not just the first in Canada, or in North America, but apparently the first such compendium in the world. The considerable taxonomic emendations, range maps, and corrected biological information should be of inrerest to specialists familiar with spittlebugs. It is also hoped that the style of presentation, rhe numerous illustrations, and the brevity of description together with the short and simple identification keys will attract the amateur, and encourage more people to take up the fascinating study of entomology. Students of entomology familiar with neirher the principles and practice of taxonomy nor with identification keys should consult the excellent summaries on these topics found in A. B. Klots' Field Guide to the Butterf lies ol North America, East of the Great Plains of the Peterson Field Cuide Series, published by Houghton Mifflin Co., Boston in 1951. Although this publication technically covers the spittlebugs of Canada only, workers throughout rhe United States will find most of their species included. The exceptions are mostly in the genus Clasloptera Germar, for which there is already an excellent compendium on rhe North American fauna (Doering 1928). Acknowledgments I wish to thank the following persons for providing rhe marerial used in this survey of the Canadian fauna: G. E. Ball, University of Alberta, Edmonton J. H. Cayford, Great Lakes Foresr Research Centre, Sault-sainte- Marie, Ont. G. C. Eickwort, Cornell University, Ithaca, N.Y. D. Evans, Pacific Forest Research Station, Victoria, B.C. A. R. Forbes, Agriculture Canada Research Station, Vancouver, B.C. M. M. Furniss, U.S. Department of Agriculture Forest Service, Moscow, Idaho O. Krepinsky, Acadia University, Wolfville, N.S. J. P. Laplante, Centre de recherches forestidres des Laurenrides, Sainte-Foy, Qudbec R. F. Morris, Agriculture Canada Research Station, St. John's, Nfld. P. W. Oman, Oregon State University, Corvallis D. H. Pengelly, University of Guelph, Guelph, Ont. K. W. Richards, Agriculture Canada Research Station, Lethbridge, Alta. 6 A. G. Robinson, University of Manitoba, Winnipeg D. A. Ross, Forest Entomology Laboratory, Vernon, B.C. G. C. E. Scudder, University of British Columbia, Vancouver, B.C. V. R. Vickery, Macdonald College, Sainte-Anne-de-Bellevue, Qu6bec B. Wright, Nova Scotia Museum, Halifax Information on distribution patterns of forest types and tree species was taken from Natiue Trees of Canada, Tth ed., (R. C. Hosie, Canadian Forestry Service; I969). Information on climate came from The National Atlas ol Canada,4th ed., (Macmillan, Toronto; 1974). Introduction The sight of a foamy globule adhering to a grass stem, or embedded among pine needles, or pendant on the slender twigs of bushes is so familiar a sight to many Canadians that it seldom attracts curiosity. More frequently it excites disgust: particularly among children barefoot in a meadow, or among picnickers seeking a dry spot to spread their feast. Yet this is a glimpse of a truly exotic facet of entomology, for buried beneath the glistening bubbles is a living insect, a spittlebug. Spittlebugs are generally abundant, yet seldom noticed. Adults are so alert and such prodigious jumpers that they are usually unseen. General collecting with a sweep net usually turns up hundreds of individuals. These insects so closely resemble their more familiar relatives, leafhoppers, that they are frequently confounded with the latter even by incautious entomologists. The young, living as they do in "spittle masses," are completely screened from view. Wiping away the bubbles with care and patience, will reward the curious with only a squat, pale lump that might be mistaken for a bud; until it stretches its legs, pulls itself free of the stickly fluid, and clambers with rapid strides away from danger. The species of spittlebugs and their way of life are poorly known. Fewer than half the species in Canada had been reported prior to 1977 . Lif.e history studies have been conducted on only l0 of these, and the information available is still fragmentary. The immatures of some of the most common species remain unknown. Obviously, much taxonomic and rearing work remains to be done. Life history The biology of only a few species of Cercopidae is known, and hence it is difficult to generalize about their behavior. Most of the following information is gleaned from papers on the economics of various species of the genera Philaenus Stil (Osborn 1916, Mundinger 1946, Weaver and King 1954), Neophilaenus Haupt (Osborn 1916, Garman l92l), Aphro- phora Germar (Capanni 1894, Walden 1917, Metcalf and Barber 1929, Speers 1941, Andersonl94T b, Severin 1950, Kelson 1964), LepyroniaAmyot & Serville (Doering 1922, Ossiannilsson 1950), and Clastoptera Germar (Lintner 1889, Garman 1923, Bennett and Hughes 1963). Where it seems important to note exceptions to the generalities cited, these are marked with the letters A, C, L, N, and P to designate the genera Aphrophora, C lastop ter a, Lepy ronia, N eop hilaenzs, and P hilaenus, respectively. Gravid females usually lay their eggs in the fall, but sometimes also in midsummer (A, C, N), or in early spring (A, L) atter overwintering under ground litter or in crevices in bark. Relatively few eggs are laid, usually not exceeding 35 per female, but occasionally up to 50 may be laid (L, P). Some individuals may lay only about l0 eggs (A, N, P). The eggs are usually inserted into the plant tissue by means of the female's knifelike ovipositor, which cuts a longitudinal (A, L) or diagonal (C) slit in a needle, stem, or petiole. Other spittlebugs may simply insert the eggs into crevices, such as needle sheaths, Ieaf sheaths of grasses, under bud scales, or under bark (Baker 1972). The few eggs that are laid at one time are embedded in a whitish gluelike substance which tears to expose the egg shortly before the young insect, or nymph, hatches. The egg shell is broken with the aid of a hardened plate, or egg burster, on the outer embryonic cuticle, which the young insect presses against the shell. Newly hatched spittlebugs are extremely active, rambling over the plant on which the eggs were laid, until a suitably succulent feeding site is found. Some feed on the aerial parts of the plant, while others feed on the subterranean root crowns. They may wander a considerable distance, or even drop from tree branches to the ground before reaching their host plant (A). Having selected a feeding site, the young insect inserts its beak and proceeds to draw sap. A filtering chamber in its oesophagus (Snodgrass 1935) passes much of the excess water (and a considerable amount of sugar) directly to the posterior part of the gut. This bypass results in more sap being ingested than digested, and the excess flows from the anus and adheres to the plant and the nymph. Soon enough fluid gathers in a shining droplet to cover the tiny insect entirely. The nymph breathes by means of a tubelike canal below its abdomen, which is formed by the large plates fringing the abdomen and almost meeting below the body; the breathing pores, or spiracles, lie within this canal. The air in the canal is replenished by the thrusting of the tip of the abdomen outside the droplet. Spittlebug nymphs grow in a series of five stages, or instars, each separated by a molt which permits a larger cuticle to form around the body. These molts usually occur within the fluid in rvhich the nymphs live; the cast-off skins remain clinging to the plant, or floating in the fluid. As the insect grows in size, its droplet increases in size and bubbles begin to appear. The first of these bubbles may be due to the breathing activity of the nymphs, but by the time the second instar is reached the nymph actively begins to produce bubbles, thus permitting a larger liquid 8