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 fiavescens (Fabr.). 



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

 Typhloriibn flai-escens Flor., Rhyu. Livl., ii, p. 394, 1861. 

 Cieadula Jiarescens Sahib., Cicad., p. 161, 1871. 

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

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

 ' Empoasca fiavescens Osb., 20th Rept. N. Y. St. Ent., p. 543, 1905. 



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

 Empoasca fiavescens Van D., Cat. Heniip. X. A., p. 706, 1917. 

 Empoasca fiavescens Fent., Ohio Jl. Sci., xviii, p. 186, 1918. 

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



Form: Very much like mali. 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; pygofers 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 : 



