No. 34-] HEMIPTERA OF CONNECTICUT I CICADELLIDAE. 73 



Reported from New York on hornbeam, and from Maine on 

 hazel and Viburnum. This conspicuously marked form should 

 occur in Connecticut from June to August. 



O. distinctus (Van Duzee). Bythoscopus distinctus Van Duzee. 



Ent. Amer., vi, 224, 1890, 



Easily separated from the others of the genus by the two ante- 

 apical and four apical cells. Elytra subhyaline with dark markings 

 on basal half and apex. Vertex and pronotum yellowish, punc- 

 tures coarse and black. Length 3.5-4.5 mm. 



Reported by Van Duzee from Popuhis and Quercus. Practi- 

 cally all specimens collected by the author were from Juglans nigra, 

 where it is commonly found both as nymph and adult. 



Subfamily Cicadellinae. 

 Tettigoniellidae. 



This group as considered at the present time includes those 

 forms which have the ocelli located on the disc of the vertex and 

 the body cylindrical, not dorso-ventrally flattened. We find here a 

 great diversity in head structure, and a considerable difference in 

 wing venation. The species are usually quite large, the antennae 

 are located in a rather deep cavity beneath a prominent ledge 

 formed by the margin of the vertex. 



The several species have a great diversity of food plants and 

 feeding habits. 



Key to Genera. 



1. Ocelli on disc of vertex usually closer posterior than anterior 



margin, elytra long, covering posterior segments of abdomen. 



(Fig. 5, la.) 2 



Ocelli close to margin of vertex equidistant from apex and eyes, 

 elytra short, apices well rounded, not covering posterior seg- 

 ments of abdomen Evacanthus, p. 80 



2. Elytra narrow not covering lateral margins of abdominal seg- 



ments, antennal sockets deep, overhung by a distinct ledge, head 



and pronotum usually deflexed, sloping. (Fig. 7, i.) 3 



Elytra broader, covering lateral margins of segments, antennal 

 sockets small, head and pronotum not deflexed, usually in 

 straight line with scutellum and elytral suture. _ (Fig, 7, 2.) 4 



3. Pronotum with posterior margin rounding, with slight median 



excavation, vertex rather deeply, longitudinally furrowed 



Aulacizes, p. 75 

 Pronotum broadly roundingly emarginate posteriorly, almost 

 parallel with anterior margin, vertex without indication of longi- 

 tudinal furrow. (Fig. 7, i.) Oncometopia, p. 74 



4. Elytra not reticulate veined at apex, head not greatly produced, 



(Fig. 7,3-) 5 



Elytra reticulate veined on apical third, head produced, usually 

 longer than pronotum. (Fig. 5, i ; Fig. 7, 4.) Draeculacephala, p. 78 



5. Vertex flat, margin of vertex sharp, angled with front 



Graphocephala, p. 77 

 Vertex sloping to front, often conical, not sharp and more rounded 

 to front 6 



