No. 34-] HEMIPTERA OF CONNECTICUT: CICADELLIDAE. 1 33 



Acinopterus Van Duzee. 



Head narrower than pronotum, vertex short, obtusely angled. 

 Elytra rather narrow, without appendix, costa feebly convex, 

 narrowed to apex which is acutely angled. 

 A. acuminatus Van Duzee. (Fig. 9, 6 ; Fig. 10, 7.) 



Psyche, vi, 308, 1892. 



Easily recognized by the fulvous brown and greenish coloration, 

 and the elytra which are acutely angled at apex. The basal angles 

 of scutellum and tips of elytra often darker, nervures pale, disc 

 of costa and discal areoles of corium whitish hyaline. Length 

 5-6.5 mm. 



A grass-feeding species found commonly in the south but only 

 occasionally in the north in pastures and waste places. 



Rockville, 23 Aug., 1905 (H. L. V.). 



Thamnotettix Zetterstedt. 



Body usually elongate, vertex varying from broadly rounded to 

 obtusely angled, the former type rounding to the front and the 

 latter usually angled with front. Elytra as a rule possessing but 

 one cross vein between the sectors. This will not hold good, 

 however, for all species of the genus, as some resemble Delto- 

 cephalus in that respect. 



They are diverse in food habits as well as structural char- 

 acters and while some apparently live and feed entirely on trees 

 or shrubs, others are grass feeders. Also some are two brooded 

 and others apparently have but a single brood each season. 



Key to Species. 



1. Vertex short, broadly rounded, scarcely produced before eyes, 



almost parallel margined, rounded to meet face without definite 



margin 2 



Vertex longer, somewhat produced, usually angulate, never parallel 

 margined, decidedly angled with the front forming a definite 

 margin 8 



2. Vertex with two large black spots on rounded margin of apex . . 3 

 Vertex yellowish unmarked, pronotum, scutellum, outer margin and 



apex of clavus brown, clavus yellow eburatus 



3. Elytra dark or subhyaline without yellow spot on clavus 4 



Elytra dark with costal margin and a large spot on clavus, yellow 7 



4. No dark bands on vertex, pronotum without band covering posterior 



half, wings dark or smoky, venation inconspicuous 5 



A dark band on base of vertex between the eyes, a pale band cover- 

 ing posterior half of pronotum, elytra smoky with pale conspicu- 

 ous venation belli 



5. Entire insect brownish, not flecked with red, claval suture pale ... 6 

 Brownish, completely flecked with bright red, elytral veins same 



color morsei 



6. Species large, 6 to 6.5 mm., claval suture conspicuous, narrow band 



across middle of pronotum kennicotti 



Species smaller, less than 6 mm., claval suture almost concolorous 

 with elytra, faint suggestion of a band on pronotum brittoni 



