Key to the genera of temperate North American Cicadidae adults (adults)

In temperate North American cicada adults hind legs are not enlarged; fore wings are usually entirely transparent; the greater part of their hind wings are not folded (only an anal and 1 jugal fold); and their mouth parts are beak-like.

1 Opercula lacking or tiny in both sexes; costal margin of forewings thickened top to bottom and bowed in both sexes; timbals absent in males; sounds produced by clacking wings in both sexes 2
1' Opercula present and obvious in both sexes, smaller in females; costal margin of forewings not thickened top to bottom and not bowed in both sexes (except in Clidophleps, see Couplet #5); timbals present (covered, or partly or entirely exposed) in males 3
2(1) Forewing with eight marginal cells, or ninth marginal cell very tiny; costal vein of forewings usually evenly and moderately curved and not much if any thicker near center of forewing then from base to node; underside of abdomen exposed when wings are closed; 22 species, Canada, western U.S.--chiefly Colorado to California, and Mexico; adult April to July Platypedia Uhler
2' Forewing with seven marginal cells, or eighth marginal cell very tiny; costal vein of forewingsbent in a strong curve near center of forewing and definitely thicker at point of greatest curvature (shortly before node) than elsewhere between base and node; apex of abdomen hidden from below if wings are closed; 3 species, western U.S. only; adult in May Neoplatypedia Davis
3(1) Mesonotum above earch forewing base in both sexes with a straited, more or less transverse, raised area extending well above margin of folded wings; opercula small in both sexes; timbals completely exposed in males 4
3' Mesonotum without straited, more or less transverse, raised areas above wing bases; opercula large or small in both sexes; timbals completely exposed, partly covered, or entirely covered in males 6
4(3) Lateral border of pronotum carinate only at posterior margin; hind wing veins and cells all very pale except for a single darkened and cell; 3 species, southwestern U.S. and Mexico; adult June to August Okanagodes Davis
4' Lateral border of pronotum carinate all along lateral edge, though flared at posterior margin; some hind wing veins darkened and some cells darkened or pigmented 5
5(4') Cross vein between last M and Cu cells usually thickened; Cu cell much wider than M cell where veins R and M fuse; vein Cu distinctly arched and cell Cu widest near its center; mesonotal shoulders with stridulatory files (anal vein scrapers at forewing bases); buzzy portion of calling song made by timballing and stridulating at same time; 7 species, southwestern U. S. and Mexico; adult June to August Clidophleps Van Duzee
5' Cross vein between last M and Cu cells never thickened; Cu cell about as wide as or narrower than M cell where veins R and M fuse; vein Cu straight or only very slightly arched, cell Cu widest at its apex; 54 species, all over U.S.,mostly western (not northeasternmost), Canada, and northern Mexico; adult May to August Okanagana Distant (and Tibicinoides Distant)
6(3') Some longitudinal veins beyond node surrounded by large dark marks which extend clear across one or more adjacent cells; and lateral flanges of pronotum very broad and produced triangularly 7
6' No longitudinal veins beyond node surrounded by large dark makes which extend clear across one or more adjacent cells; lateral flanges of pronotum usually not broad and not triangular 8
7(6) Hind wings with a broad dark mark extending inward from costal margin beyond node; posterior margin of mesonotum apparently touching metanotum and basal adominal tergite; timbals mostly exposed, covered in part at middle by a triangular abdominal flap; (only one bownish species extending northward only along W. coast of Mexico, adult June to August Chinaria Davis
7' Hind wings without dark mark beyond node; posterior margin of mesonotum arched and held above metanotum and basal abdominal tergite, especially in males; timbals exposed above, but partially covered below and at sides by a broad rounded flap; only one or two green and black species, only in Mexico; adult August to November Zammara Amyot and Serville
8(6) Veins M and Cu coalescing beyond apex of basal cell in fore wing; timbals completely exposed; small species, usually under 15 mm. in body length; 5 species, all southern U.S. or Mexican, grass-inhabiting; adult June to August) Melampsalta Kolenati
8' Veins M and Cu coalescing behind apex of basal cell in fore wing; timbals exposed or covered; body length usually over 15 mm 9
9(8') Eyes and all wing veins reddish; and pronotum viewed dorsally entirely black; timbals completely exposed; 7 species occurring in temporally, chronologically , and geographically separated brood populations, eastern U.S. and formerly Canada; adult May to July in huge numbers , only in certain years (see separate schedule of broods and expected emergence dates) Magicicada Linnaeus
9' Both eyes and all wing veins never reddish; pronotum viewed dorsally usually not entirely black, but if black then usually quite hairy 10
10(9') Marginal membrane in forewings as wide as or wider than width of 5th marginal cell; last two (esp. 5th) marginal cells squarish and nearly the same size; abdomen broad and rounded behind; sides subparallel for at least 3/4" length of abdomen; timbals completely covered; 9 species, western U.S. and Mexico; adult May to August Cacama Distant
10' Marginal membrane in forewings less than 3/4 width of 5th marginal cell, last marginal cell elongate and much longer than next to last; abdomen tapering, sides not parallel; timbals covered or exposed 11
11(10') Longest apical crossvein in forewings more than 1/3 length of portion of longitudinal vein connecting apical crossvein pair; or length from tip of head to tip of folded wings more than 30 mm and less than 60 mm 13
11' Longest apical crossvein in forewings 1/4 or less length of portion of longitudinal vein connecting apical crossvein pair, or length from tip of head to tip of folded wings either less than 30 mm or more than 60 mm 12
12(11') Length from tip of head to tip of folded wings less than 30 mm; small species; timbals partially covered laterally by a flap-like process; compound eyes borne on lateral prominences so that head including eyes is about as wide as or wider than pronotum where it flares at rear border; 2 species, Arkansas, Louisiana, southwestern U. S. and Mexico, particularly common in mesquite areas; adult May to July Pacarina Distant
12' Length from tip of head to tip of folded wings over 60 mm; large species; timbals only partially covered posteriorly by a triangular flap at side of abdomen; 1 species, southern Texas to Mexico and Brazil and Argentina; stutter and whine song produced from late afternoon through dusk, and sometimes all night under streetlights or full moon; adult June to August Quesada Distant
13(11) Body length (tip of head to tip of abdomen) less than 15 mm. in males (sometimes 16 or 17 mm. in females); timbals only slightly covered posteriorly; 2 species, southern U.S. and Mexico; adult June to August Beameria Davis
13' Body length over 16 mm. in males, usually over 18 in females; timbals in males covered, partly covered, or completely exposed 14
14(13') One or more longitudinal veins in forewings reddish; base of pronotum usually reddish (sometimes black) and pronotum usually hairy; longest apical crossvein in forewings usually 1/2 or more length of portion of longitudinal vein connecting apical crossvein pair; timbals completely exposed; 50 species, all over U.S.,mostly western (not northeasternmost), Canada, and northern Mexico; adult May to August Okanagana Distant
14' Longitudinal veins in forewings yellow, brown, or black; base of pronotum usually green, yellow, or brown (but sometimes black) and pronotum usually bare; timbals completely or partly exposed 15
15(14') Length of forewing (base to apaex) 3.6 or more times width of head across eyes; both dorsal thorax and forewings strongly patterned; portion of vein Cu between crossveins closing cell Cu and cell M twice or more the length of portion of same Cu vein dividing last two marginal cells; abdomen translucent in males; timbals mostly covered by a broad flap from abdomen; 2 or 3 species, southwestern U.S. and Mexico, and over most of eastern U.S. except central portion; adult June to August Neocicada Linnaeus
15' Length of forewing (base to apex) less than 3.6 times width of head across eyes; dorsal thorax and/or forewings not strongly patterned; portion of vein Cu between crossveins closing cell Cu and cell M less than twice length of portion of same. Cu vein dividing last two marginal cells; abdomen not translucent in males; timbals completely covered 16
16(15') Sides of upper abdomen between middle and base with white waxy white sports or areas 17
16' Sides of upper abdomen between middle and base without waxy white spots or areas, but sometimes with dense silvery or whitish patches of setae 18
17(16) Only one waxy white spot on each side of upper abdomen between middle and base, or waxy white areas present on posterior mesonotum or on middle of upper surface of first abdominal segment; posterior lateral margins of last abdominal tergite in males without a thorn-like process and apex of uncus simple and rounded; 30 species, eastern Canada, northern Mexico, and all over U.S. except for far west; adult May to November Tibicen Latreille
17' More than one waxy white spot on each side of upper abdomen between middle and base and no white marks on either posterior mesonotum or on middle of upper surface of first abdominal segment; posterior lateral margins of last abdominal tergite in males with a stout or elongate thorn-like process and apex of uncus divided into a pair of curved spines; 3 or 4 species, Mexico and southwestern U.S. only; adult May to July Cornuplura Davis
18(16') First apical longitudinal vein with marginal portion beyond anterior apical crossvein greater than .62 (5/8) times entire apical longitudinal vein 19
18' First apical longitudinal vein with marginal portion beyond anterior apical crossvein less than .62 (5/8) times entire apical behind crossvein (see below) Diceroprocta Stšl
19(18) Forewing length (base to tip) less than 32 mm.; or middle of apex of upper abdomen with a large, waxy, white area; dorsal midline of last abdominal tergite in males broadly and concavely rounded, posterior sides of this tergite carinate from below level of anus and extending sides like a pair of flat horns above anus; incus short and with a median backward-projecting small knob near base; 26 species, Caribbean, Mexican, and southern and southwestern U.S., except for one species extending up through Illinois to southwestern Michigan and one other species extending up Atlantic Coast to New Jersey; adult April to September Diceroprocta Stšl
19' Forewing length (base to tip) greater than 32mm.; and middle of apex of upper abdomen without a waxy white area; dorsal midline of last abdominal tergite in males usually extending posteriorly spinelike (feebly lobed posteriorly or rounded in only 2 or 3 species), posterior sides of this tergite rounded below level of anus and extending above level of anus in only 2 or 3 species as low, rounded lateral knobs; uncus long and without a median backward-projecting knob near base; 38 species, eastern Canada, Northern Mexico, and all over U.S. except far west; adult May to November Tibicen Latreille

Revised 1 Apr. 2001