150 MAINE AGRICULTURAL EXPERIMENT STATION. I915. 



to the genera is given b}' Prof. Gillette and includes all the known 

 American genera and all of these except Alehra have already been taken 

 and it is probable that Alebra will yet be found as two species have 

 been recorded for Xew York, and one or both of these should occur 

 in Maine. 



Key to Xorth American- Genera. 



A. Sectors of the posterior wings ending in a marginal vein. 



B. Elytra with an appendix beyond the clavus Alebra. 



BB. Elytra without appendix 



C. Two apical cells in posterior wing Dicraneura 



CC. One apical cell in posterior wing Empoasca 



AA. Sectors of the posterior wings ending in wing fnargin, no marginal 



vein. 



Sectors 8 and 2 uniting so that only three veins extend to the 



margin Typhlocyba 



All four sectors extending to the wing margin Eupieryx 



Genus Dicraneura. Hardy. 



The species of this genus found in Maine are slender with pointed 

 heads and are readih- separated from the related forms by the marginal 

 vein in the hind wing, absence of appendix and presence of two apical 

 cells in hind wing. The Maine sepcies may be more readily placed by 

 help of the following key. 



A. Elytra with a deep triangular cell on costal margin cruentata. 



AA. Eh'tra with apical cell on costal margin lanceolate or wanting. 



a. Elytra milk}' white, nervures indistinct communis. 



aa. Elj'tra yellowish or pinkish. 

 b. Venter yellow fieberi. 



bb. Venter nearly or entirely black carneola. 



Dicraneura communis Gillette. 

 Dicraneura communis Gillette. Proc. U. S. Xat'l Mus. XX, 718. 



Light gray or whitish -without markings, the head pointed. Length 

 3 mm. 



This species has occurred in considerable abundance in some locali- 

 ties, the records being Orono, Aug. 5th ; Black Cap. Mt., Aug. loth ; 

 Portland. Aug. 13th, where it was taken from grass near the tide 

 water or salt marshes, and Highmoor Farm from grass and oats. At 

 Portland and Highmoor Farm especially it was plentiful enough to be 

 counted of economic importance. 



Dicraneura cruentata Gillette. 



Dicraneura cruentata Gillette. Proc. U. S. Xat'l ]Mus. XX, 717. 

 This is a milky white species with a black point at the end of the 

 clavus. The head is rounded in front not so distinctly pointed as 

 communis. Length 3 mm. 



