No. 34-] HEMIPTERA OF CONNECTICUT I CICADELLIDAE. 59 



margin of the vertex. The vertex is usually short and very broad, 

 rounding to the front so that no definite margin is between them. 



Key to Genera. 



1. Anterior margin of the pronotum not produced beyond the 



anterior margin of the eyes, vertex distinctly and broadly 



rounded anteriorly. (Fig. 5, 6a.) 2 



Anterior margin of pronotum strongly produced beyond anterior 

 margin of eyes, vertex obtusely angulate. (Fig. 5, 4a.) 4 



2. Head across eyes as wide as, usually wider than pronotum, 



humeral angles rounded, not prominent 3 



Head, including eyes, narrower than pronotum which is widened 

 by prominent humeral angles [Bythoscopus] 



3. Elytra with large appendix, vertex very broadly curved before, 



almost straight. (Fig. 5, 6a.) Idiocerus, p. 61 



Elytra with appendix very small or wanting, vertex more dis- 

 tinctly curved and produced anteriorly. (Fig. 5, 3.) . . Agallia, p. 59 



4. Vertex strongly angled, striations on pronotum extending 



obliquely from median longitudinal line toward humeral angles 



(Fig. 5, 4a.) Macropsis, p. 66 



Vertex more obtusely angled, pronotum with striation transverse 

 or nearly so. (Fig. 5, 5a.) Oncopsis, p. 69 



Agallia Curtis. 



Comprised of small species varying from brown to dirty white, 

 but usually the former color. Vertex well rounded almost parallel 

 margined, head wider than elytra at base. Face as long as wide, 

 elytra with an appendix. 



Contrary to the feeding habits of most of this subfamily, the 

 species of Agallia live almost entirely upon herbaceous plants. 

 They are commonly found on grasses and sedges in pasture land, 

 on the undergrowth in woodland, and are very common on clover 

 and truck crops. A few of the most important economic species 

 belong here. 



Key to Species. 



Pronotum marked with two round black spots on disc or the pos- 

 terior half, often very small, length exceeding 3.5 mm 2 



Spots on anterior half of pronotum usually close to anterior 

 margin, size smaller, 3 mm. in length sanguinolenta 



Vertex marked with six black spots, and a pair of large round 

 spots on the disc of pronotum; female segment roundingly 

 produced oculata 



Vertex with few spots, pronotum with spots on posterior portion 

 only 3 



Narrow, elytra narrow in proportion, usually with a dark median 

 longitudinal line on the anterior two thirds of pronotum 4 



Broader, robust, almost 2 mm. wide, dark almost unicolorous. 

 elytra short and b^oad quadri-punctata 



