246 THE UNIVERSITY SCIENCE BULLETIN. 



Kmiioa rosce Van D., Cat. Hemip. N. A., p. 710, ]<)17. 



Empoa roscc Childs, Ore. Agr. Col. Exp. Sta., Bui. 148, 1918. 



Empoa ro<r Lathr., Jl. EC. Ent., xi, p. 144, 1918. 



Empoa row Lathr., N. Y. Agr. Col. Exp. Sta., Bui. 451, 1918. 



Typhlocyba rosce McAt., Can. Ent., 1, p. 361, 1918. 



Empoa rosce Lathr., S. C. Agr. Exp. Sta., Bui. 199, p. 119, 1919. 



Empoa rosce Ack., U. S. Dept. Agr., Bur. Ent., Bui. 199, p. 20, 1919. 



Form: Length, about 3.5 mm. Vertex one-third longer on middle than 

 next the eye, less than twice as wide as long. Pronotum less than twice 

 as wide as long, lateral margins long and broadening posteriorly, pos- 

 terior margin emarginate. Elytra very long and narrow. 



Color: Uniformly white or yellowish-white except for dark eyes and 

 tarsal claws. 



External genitalia: Female, last ventral segment twice as long as 

 the preceding, narrowed posteriorly, posterior margin truncate; pygofers 

 moderately broad, rather short, slightly exceeded by ovipositor, sparsely 

 spiny apically. Male, valve broad but very short, lateral margins strongly 

 narrowed posteriorly; plates long and narrow, lateral margins slightly 

 concave just before middle and rather strongly emarginate apically, the 

 black-tipped apices being divergent and curved dorsad; pygofers large, 

 touching the tips of the plates, with a small terminal dorsal tooth. 



Internal male genitalia: Styles very large, with a long cephalic 

 process, after which is a distinct dorsal process, the tip of which is 

 spiny, the terminal portion long and curving strongly apically; con- 

 nective short, with three basal processes, the inner one more pointed 

 than the outer two, the base broad; cedagus with a basal dorsally di- 

 rected process which is narrow and straight at first, then widening and 

 forming a large curving process running caudo-dorsad, terminal por- 

 tion long and slender, curving, deeply bifid into two processes whose 

 tips are suddenly narrowed and acute. 



Distribution: This species is not as common in the state 

 as might be expected. It perhaps is distributed well over 

 the eastern part, but it is recorded as having been taken 

 only in Douglas and Pottawatomie counties. 



Hosts: Childs gives the following as hosts of this species: 

 Wild and cultivated rose, apple, blackberry, raspberry, Logan- 

 berry, strawberry, dogwood, prune, cherry, and Cratsegus. 

 Gillette gives plum, cherry, currant, and grape in addition. 



Genus HYMETTA McAtee. 



This monotypic genus was lately erected by McAtee for 

 the species till lately known as Typhlocyba trifasciata, but 

 which Van Duzee placed under the genus Erythroneura in his 

 catalogue. It differs from the latter genus, however, in hav- 

 ing the scutellum thickened and distinctly elevated apically. 

 Moreover, the second apical vein is curved, reaching the mar- 

 gin at the exterior angle of the elytra and often nearly or 



