LAWSON: KANSAS CICADELLID^. 101 



Genus Penthimia Germ. 



The members of this genus are short, ovate, Cercopid-like 

 insects. The head is narrower than the pronotum, the vertex 

 being very broadly rounded. Pronotum is widened posteriorly, 

 distinctly transversely striated, and with the posterior margin 

 broadly concave. The elytra, though exceeding the abdomen, 

 are very short and broad and the broadly truncate apex of 

 the clavus is very noticeable. There is a distinct appendix. 



The single American species of this genus has been taken in 

 Kansas. 



Penthimicu americana Fh. 



Pentliiviia americana Fh., Homop. N. Y. St. Cab., p. 57, 1851. 

 Penthimia vicai'ia Walk., List Homop., iii, p. 841, 1851. 

 Penthimia picta Prov., Nat. Can., p. 352, 1872. 

 Penthimia americana G. & B., Heniip. Colo., p. 83, 1895. 

 Penthimia americana Osb., 20th Kept. N. Y. St. Ent., p. 514, 1905. 

 Penthimia americana O.sb., Mc. Aarr. Exp. Sla., Bui. 238, p. 100, 1915. 

 Penthimia americana DeL., Tenn., St. Bd. Ent., Bui. 17, p. 29, 1916. 

 Penthimia americana Van D., Cat. Hemip. N. A., p. 610, 1917. 

 Penthimia americana Lathr., S. C. Agr. E.xp. Sta., Bui. 199, p. 41, 1919. 



Form: The above generic description gives the form of this species. 

 Length, 5 to 6 mm. 



Color: Varies from reddish-brown to black. 



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

 ers rounded, posterior margin slightly concave an either side of a median 

 lobe which itself is slightly or sometimes distinctly emarginate, forming 

 two teeth ; pygofers very short and broad, slightly exceeded by ovipositor. 

 Male, valve triangular; plates broad at base, tapering to acute apex, 

 bearing fine hairs on margins, as long as very short pygofers. 



Distribution: Taken only in Pottawatomie county. 



Hosts: Osborn records this species as occurring on hickory, 

 maple and other trees and shrubs. De Long reports it from 

 oak. 



Genus Gypona Germ. 



This genus contains some of our largest Cicadellidse. They 

 are more elongate than Penthimia and differ from Xerophloea 

 in lacking the broad thin-margined head of the latter. The 

 head is short and broadly rounded on the anterior margin. The 

 pronotum has distinct lateral and humeral margins and is 

 narrowed anteriorly. Its anterior margin is broadly rounded, 

 while the posterior margin is broadly, though slightly, con- 

 cave. 



The five members of the genus listed below are known to 

 occur in the state. 



