PROC. OF THE OKLA. ACAD. OF SCI. FOR 1964 Oklahoma Treehoppers (Homoptera, Membracidae) CLIFFORD J. DENNIS, Wisconsin State University, Whitewater Treehoppers are mostly active, rather abundant and often bizarre insects. They inhabit a variety of trees, principally oaks, and herbaceous vegetation. As would be expected in Oklahoma, the tree-inhabiting forms largely are found in the more wooded eastern sections, while those that frequent herbs or both herbs and trees are found rather widely distributed. Until recently Oklahoma treehoppers have been neglected. References occur in certain of my previous papers (Dennis, 1960, 1962, 1963, 1964a. 1964b) . This paper includes keys for the determination of Oklahoma species as well as county distribution records and host plants when known. Speci­ mens collected at both "black" and "white" light traps previously have been reported (Dennis, 1964a). This work was supported in part by Frontiers of Science Foundation of Oklahoma. Special thanks are due James Harlow, Executive Vice President of this organization. The following people loaned material for study or participated in collecting: George Byers of the University of Kansas, W. A. Drew and James Shaddy of Oklahoma State University, Dan Shorter and LeRoy Rader of Northwestern State College, Thomas Gray and Foster Mayer of Southwestern State College, E. Phil Rouse of the University of Arkansas and two of my sons, Al and Roy Dennis. Rich­ ard Froeschner of the U.S. National Museum prOVided collection records. To all of these I wish to express my grateful appreciation. KEy TO SUBFAMILIES- 1. a) Scutellum distinctly visible ____ .1. Centrotinae b) Scutellum concealed by pronotum ________..2 2. a) Tibiae of first two pairs of legs foliaceous, tibiae of third pair of b) ~~a~~fl:..-·l;P··str,;'pi~··:::::=::::=::::=::::~:~:=::::=::::::::::~::=:==:::::::~:~:~:..~_~~~~~~; S. a) Hind tarsi shorter than others _____ m. Hoplophorinae b) Hind tarsi at least as long as others _____ IV. Smillinae I. SUBFAMILY CENTKoTINAE Jltcrocettt"'-' coryae (Fitch) is the only species of this subfamily known from Oklahoma. -All determination. have been mad. by me. BIOLOGICAL SCIENCES 51 II. SUBFAMILY MEMBRACINAE Key to species Pronotum with two prominent yellow spots behind hom _. ................._ _ _ .Bt&CMnopa binotata (Say) Pronoturn lacking prominent yellow spots __ _.. ............................__ _ Campylmach.4a latiJ)68 (Say) lll. SUBFAMILY HOPLOPHORINAE Both the homed and unhorned forms of Platycotia vUtata (Fabricius) represent this subfamily in the fauna of Oklahoma. IV. SUBFAMILY SMILIINAE Key to tribes 1. a) Elytra entirely free and uncovered by pronotum Ceresini b) Most or all of clavus and often part of corium covered by pro- notum _ _ 2 2. a) Hind wing with terminal cell usually sessile, its base truncated, rarely with terminal cell an elongate triangle with a short petiole... ............................................................................................................. Telamonini b) Hind wing with terminal cell a petiolate, equal-sided triangle 3 3. a) Base of corium with two longitudinal veins contiguous at their bases _ Polyglyptlni b) Base of corium with three longitudinal veins, usually contiguous at their bases SmUilni TamE CERESINI Caldwell (1949) revised this tribe using male genitalia as a basis of revision. Dennis (1952) further modified generic assignments. Since keys based on male genitalia are of no use when one has a female to identify, this key to Oklahoma species does not use genital characters. It can be used for both sexes. 1. a) Base of corium with three longitudinal veins beginning near the base; pronotum not much elevated in front __..2 b) Base of corium with two longitudinal veins contiguous at their bases; pronotum much elevated in front 3 2. a) Elytra with five apical cells, veins usually dark ___ .. ..............................................._ __ ,AcutaliB tartarea (Say) b) Elytra with four apical cells, veins usually very indistinct .. _.._ __.._ .Micmtalia calva (Say) 3. a) b) ~~~~~ ~~~p~h~=r:~~~... ::::::::::::::~::::::::::::::::~::::~::::~:~:::::::~::::~==:~::: 4. a) Front of metopidium nearly vertical, its ridged sides meeting ahead of the middle of the pronotum _ TOTtwtilua .t&ermu (Fabrlch18) b) Pronotum not as above ___ _..__ .5 5. a) Metopidium seen from the front regularly narrowing to the peak; posterior median carina of pronotum not reddilh; femora often black . .....8tWtocephala '"tea (Walker) b) Metopidlum seen from the front noticeably broadened above the head; posterior median carina of pronotum otten reddish; femora not black _. ._ __._.__BpWVtUU Im"ItUl (Bay) 52 PROC. OF THE OKLA. ACAD. OF SCI. FOR 1964 8. a) Suprahumeral horns minute .._._..__..TorltstilU8 curvata (Caldwell) b) Suprahumeral horns not minute __.._ .._ _._ __..7 7. a) Pronotum brown with 11ght transverse bands _____ 8 b) Pronotum green without transverse bands __ _______..9 8. a) Pronotum very hairy, with two dark brown transverse bands; elytra clouded __..___ _................................ 8tictocep1w.la diceros (Say) b) Pronotum scantily haired, with sides ferruginous and lacking defi- nite dark bands; elytra hyaline or nearly 80 ____. ___ _ 8tictocephala. albe8cens (Van Duzee) 9. a) Venter black; pronotum of male often strongly marked with black ......................._ 8tictocephaZa basalis (Walker) b) Not as above _ ____ 10 10. a) Metopidium densely haired __ 8pi88i8tilua borealis (Fairmalre) b) Metopidium at most scantily haired ____ 11 11. a) Larger, females 9-11 Mm. long, males 8.0-9.1 mm. long _ 12 b) Smaller, females 7.3-8.3 mm. long, males 7.2-7.4 Mm. long 13 12. a) Pronotum with metopidium concave ...8tictocephala. tau-rina (Fitch) b) Pronotum with metopidium convex or straight __ .. .......................____ 8tictocephala bubalus (Fabricius) 13. a) More robust; suprahumeral horns longer, somewhat recurved and elevated; 8-9 mm long _ 8tictocephala constans (Walker) b) More slender; suprahumeral horns shorter, only slightly recurved and elevated; 6-7 mm long 8tictocephala palmeri (Van Duzee) TRIBE 'rELAMONINI Key to genera 1. a) Pronotum with dorsal hom or crest _ 2 b) Pronotum without dorsal hom or crest; either low and rounded or high, compressed foliaceous ____ 6 2. a) Pronotum with hom on anterior part situated above or in front of the humeral angles _ _ _ 3 b) Pronotum with a crest, most of which is situated behind the hu- meral angles _______. 3. a) Pronotum with hom extending anteriorly _ Thelia b) Pronotum with hom erect, compressed __ GlossOftotus •. a) Pronotum with crest quadrangular, slightly sinuate or rounded above, variable but not definltely stepped, pyramidal or lobed . ..................................--_ _._._ ___ _.......... TeZamona b) Pronotum with crest neither quadrangular nor slightly sinuate nor rounded above but definitely stepped, pyramidal, or lobed _._ _._5 5. a) Pronotum with crest having dorsum definitely stepped, anterior lobe high and rounded, posterior lobe lower and quadrangular_ .. _ ---.- --.- -..-.--- - ..-.--.----- __. ._.__._._ Heliria b) Pronotum with crest pyramidal; posteriorly may be slnuate, with a allght step on the posterior slope, or with sinuation or step absent ._.__ Palotlica 8. a) Pronotum low and rounding in frontal aspect CarynotG b) Pronotum high. compressed and foliaceous .__-ArcMaiG BIOLOGICAL SCIENCES Thelia Tehlia bimaculata (Fabricius) is the sole representative of this genus in Oklahoma. Key to species of Glo8aonott.., Pronotum with horn constricted near base in lateral aspect, obscure- ly marked acuminatU8 (Fabricius) Pronotum with horn broadest at base in lateral aspect, with a pale median narrow stripe down posterior face of horn and dorsal carina to apex tumeulatU8 (Emmons) Key to species of Telanuma 1. a) Pronotum of female wholly bright green; pronotum of male yellow with entire front brown, an oblique brown band from top of poste- rior margin of crest to lower edge, apex brown unicolor Fitch b) Pronotum not as above _ 2 2. a) Pronotum with crest very large, usually quadrangular, may over- hang the metopidium __ 3 b) Pronotum with crest smaller, usually rounding, if somewhat quad- rangular placed well back on pronotum . 3. a) Pronotum with crest vertical in front, % to %. the length of the pronotum, color a uniform, pale testaceous with a creamy stripe on posterior face of crest _ extrema Ball b) Pronotum not as above _ ampelopatdta (Harris) 4. a) Pronotum with crest almost three times as wide 88 high or very low, long and rounding from the metopidium with a definite angle 6 b) Pronotum at most twice as wide as high 6 5. a) Pronotum with posterior angle of crest prominent in female, obso- lete or rounded in male, color dirty yellow with a greenish cast . ....................................................._ _............................................................................. reclioota Fitch b) Pronotum with crest very low, posterior angle obsolete or round- ing, color pale mottled with brown or black _ weatcotU Goding 6. a) Pronotum red, maculate with white decorata Ball b) Pronotum not as above 7 7. a) Pronotum of female pale green or brown, male often dusky, both sexes with a coppery sheen, irrorate with white .. ................._ _............................................................................................ 'monticola (Fabricius) b) Pronotum not as above _ 8 8. a) Larger, female 10.5-12.0 rom long; male 10.0-10.6 mm long . ..........._ _ _.....................................................................................