Biology of the Membracidae of the Cayuga Lake Basin 217 



Tegmina concolorous brown, opaque, costal margins slightly punctate, and feebly pubes- 

 cent at base; veins distinct; five apical and one discoidal cell. First two pairs of legs broadly 

 foliaceous; hind tibiae spined; tarsi thin. 



Length 5 mm.; width 2 mm. 



SUBFAMILY SMILIINAE 



By far the largest number of the species of Membracidae in the United 

 States belong to the subfamily Smiliinae, and it is as representatives of 

 this subfamily that all the remaining species of the Cayuga Lake Basin are 

 to be considered. 



The division is a large one and includes many genera. These genera 

 may be separated by the following key: 



A. Eljira entirely free; not covered by pronotum. 

 a. Veins of corium closely united at base. 



b. Suprahumeral horns present Ceresa 



bb. Suprahumeral horns ab.sent Stictocephala 



aa. Veins of corium widely separated at base. 



b. Elytra with five apical areas; veins distinct Acutalis 



bb. Elytra with four apical areas; veins indistinct Micrutalis 



AA. Elytra partly or entireh' covered by pronotum. 



a. Terminal cell of hind wing sessile, its base truncate, 

 b. Pronotum without horn or crest. 



c. Dorsum low and rounded Carynota 



cc. Dorsum high, compressed, and foliacco:; Archasia 



bb. Pronotum with horn or crest. 



c. Horn anterior and porrect Thelia 



cc. Horn a fiat dorsal crest. 



d. Crest ari.sing from between humeral angles Glossonotus 



dd. Crest arising from behind humeral an?;le.s. 



e. Crest step-shaped Heliria 



ee. Crest not step-shaped Telamona 



aa. Terminal cell of hind wing triangular and petiolatc. 

 b. Base of corium ^ith three veins. 



c. Corium without cross-vein at base Smilia 



cc. Corium with cros-s-vein at base. 



d. Dorsum rounded Ophiderma 



dd. Dorsum strongly compressed. 



e. Pronotum inflated posteriorly Xantholobus 



ee. Pronotum not inflated posteriorly. 



f . Crest highest anteriorly Atymna 



ff . Crest highest near middle Cyrtolobus 



bb. Base of corium with two veins. 



c. Apical cell of tegmen transverse Vanduzea 



cc. Apical cell of tegmen triangular. 



d. Dorsum strongly elevated, with deep median notch Entylia 



dd. Dorsum only slightly elevated, with weak median depression. Publilia 



The genus Ceresa A. & S. 



The first of the genera of the Smiliinae to be considered is the genus 

 Ceresa, of which seven species are represented in the basin. This genus 



