244 



THE UNIVERSITY SCIENCE BULLETIN. 



perburn" on this crop, and he has therefore proposed the name 

 of "potato leafhopper" for this species, for it is now known to 

 pass its life cycle on potato. 



Empoasca ftavescens (Fabr.). 



Cicada flavescens Fabr., Ent. Syst., iv, p. 46, 1794. 



Typhlocyba flavescens Flor., Khyn. Livl., ii, p. 394, 1861. 



Cicadula flavescen Sahib., Cicad., p. 161, 1871. 



Chlorita flavescen Fieb., Revue d'Ent., iii, p. 57, 1884. 



Empoasca flavesce s Gill., Proc. U. S. Natl. Mus., xx, p. 745, 1898. 



Empoasca flavesce s Osb., 20th Kept. N. Y. St. Ent., p. 543, 1905. 



Empoasca flavesc s DeL., Tenn. St. Bd. Ent., Bui. 17, p. 102, 1916. 



Empoasca flavesc Van D., Cat. Hemip. N. A., p. 706, 1917. 



Empoasca flavesc s Fent., Ohio Jl. Sci., xviii, p. 186, 1918. 



Empoasca flavescens Lathr., S. C. Agr. Exp. Sta., Bui. 199, p. 112, 1919. 



Form: Very much like mail. Length, about 3.5 mm. Vertex one- 

 third longer at middle than next the eye, distinctly produced, one-half 

 longer than wide. Pronotum less than twice as wide as long, anterior 

 margin broadly convex, posterior margin distinctly concave. Elytra long 

 and narrow. 



Color: Yellowish or yellowish-green. Vertex with median line, and 

 a pair each of anterior and posterior oblique lines, white. Pronotum usu- 

 ally with three white anterior spots. Scutellum usually with three 

 white longitudinal lines on basal portion and a broad transverse white 

 band back of impressed line. Elytra pale green, nervures indistinct, api- 

 cally hyaline. Face yellowish above, greenish below, with broad white 

 median line and whitish markings between this and the eye. 



External genitalia: Female, last ventral segment long, posterior mar- 

 gin produced ; pygof ers rather robust, spiny mesally, exceeded by oviposi- 

 tor. Male, last ventral segment over twice the length of the preceding; 

 plates broad basally, regularly tapering to the rounded upturned apices, 

 with a row of submarginal spines, and hairy marginally and apically; 

 pygofers short, completely hidden by the plates. 



Distribution: A very common species which is distributed 

 all over the state as shown by the following map : 



