No. 34-] HEMIPTERA OF CONNECTICUT! CICADIDAE. 239 



As far as is known at present, there are but nine species of 

 cicadas belonging to three genera* found in the Northeastern 

 United States, seven of which are to be found in Connecticut. 



Key to Genera. 



1. Tympanal coverings absent 2 



T3mipanal coverings entirely concealing tympanal orifices. Head 



broad ; eyes prominent Tibicen, p. 239 



2. Head, including eyes, about as broad as base of mesonotum 



Tibicina, p. 241 

 Head, including eyes, considerably narrower than base of mesono- 

 tum; uncus always exposed Okanagana, p. 242 



Tibicen Latreille. 



The species of this genus found in Connecticut are large, black 

 and greenish colored insects with heads broader than base of 

 mesonotum. The first and second cross veins of the fore wings 

 are generally clouded in mature individuals, and the first cross vein 

 starts far back from radius 3, that is, nearer to the base of the 

 wing than in some other genera. 



Key to Species. 



1. Abdomen beneath with a broad, shining median stripe 2 



Abdomen beneath without broad, shining median stripe 4 



2. Hind margin of the pronotum or collar, greenish ; body black and 



greenish 3 



Hind margin of pronotum black; wing expanse about 95mm.; 

 body black and brownish green lyricen 



3. Wing expanse about 85 mm. ; costal margin of fore wing rather 



suddenly bent near the middle linnei 



Wing expanse about 75 mm. ; costal margin of fore wing an even 

 curve canicularis 



4. Wing expanse about 115 mm. ; opercula short and rounded auletes 



Wing expanse about 95 mm. ; opercula much longer than broad . . 



chloromera 



T. auletes (Germar). (PI. v, 7 and 8.) 



Silb. Rev. Ent., ii, 65, 1834. 



This may be Cicada grossa Fabricius, but in the original descrip- 

 tion the habitat of that species is given as Brazil. 



Tibicen auletes is the largest cicada in Northeastern North 

 America and may be readily distinguished by that character alone. 

 Its general coloring is olive-green and black with the hind margin 

 of the pronotum or collar entirely olive-green. In fresh specimens 

 the dorsal surface of the abdomen has the basal and two terminal 

 segments pruinose, leaving four segments between, black. At 

 least in the northern part of its range this species seems to be 

 partial to sandy situations. Its song is monotonous and without 

 much vim to it, and of a hot summer's day a number of them may 

 sometimes be heard singing together about four or five o'clock in 

 the afternoon. 



♦ The generic names here used are those of the recently published list of 

 Hemiptera by Edward P. Van Duzee. 



