No. 34-] HEMIPTERA OF CONNECTICUT I CICADELLIDAE. 159 



Originally described as a pest of beans, but no doubt occurs on 

 other forms of vegetation as do others of this group. A rather 

 uncommon form, and perhaps is an Empoasca. 



East River, 8 Aug., 1908 (C. R. E.) ; New Haven, 7 July, 1909 

 (B. H. W.). 



Erythroneura Fitch. 



Zygina Fieber. 



Idia Fieber. 



Vertex produced distinctly but rather bluntly angled, with apex 

 usually slightly rounded. Elytra with apical cell between outer 

 and middle sectors quadrate, elongate, the sectors joined by a cross 

 nervure. Usually brightly colored. 



Among the species belonging here are several very destructive 

 to vineyards and known as "grape leaf-hoppers." Some of these 

 are found only occasionally or in limited areas, others are pests 

 and are widespread and distributed over the entire United States. 

 As a group they hibernate as adults under leaves in wooded areas, 

 or under the rough loose bark of shade and fruit trees, and can 

 be found almost anytime during the winter by pulling off the loose 

 bark or sifting among the leaves. Most of these are pale with 

 bright color markings. 



Key to Species. 



Without three distinct transverse bands 2 



With three distinct transverse dark bands, one crossing pronotum 



and two crossing elytra tricincta 



Almost entire coloring concentrated on elytra before cross nervures 3 

 Coloring not concentrated on basal portion of elytra, often pale 



with slight markings 7 



Coloration bright red 4 



Coloration in form of a basal brown transverse band on elytra . . 



comes var. basilaris 



Base of elytra almost solidly and uniformly red 5 



Base of elytra entirely flecked with red trifasciata 



Head and pronotum without red markings 6 



Head and pronotum marked with red, basal two-thirds of elytra red 



crevecoeuri 

 Costal areas and a large round spot at middle of elytra on com- 

 missural line, white hartii 



Elytra without commissural white spot tunicarubra 



Elytra without black spot on corium 8 



Elytra with a large black spot often red margined, at middle of 

 claval suture ; vertex, pronotum and scutellum often each with a 



red spot illinoiensis 



Elytra pale with red markings 9 



Color dark almost uniform, often with pale spots 10 



An oblique red line on clavus and one on inner sector of elytra obliqua 



Marking in form of zigzag or broken lines or spots 



comes and var. maculata 

 A pale median line on vertex, pronotum and scutellum with a dash 

 either side of it on vertex and pronotum 11 



10 



