116 THE UNIVERSITY SCIENCE BULLETIN. 



Dorycephalus vanduzei 0. & B. 



Dorycephahis vanduzei O. & B., Proc. Dav. Acad. Sci., vii, p. 74, pi. 6, fig. 2, 1898. 

 Dorycephalus vandvzei Ball, Kept. la. Acad. Sci. for 1899, p. 68, 1900. 

 Dorycephalus vanduzei Van D., Bui. Buf. Soc. Nat. Sci., is, p. 216, 1909. 

 Dorycephalus vanduzei Van D., Cat. Hemip. N. A., p. 623, 1917. 



Form: More slender than the preceding species, being about ten times 

 as long as wide. Length, female, 13 to 14 mm.; male, 8.5 to 12 mm. Fe- 

 male, vertex about two and a half times as long as width across eyes, 

 with three longitudinal carinje. Pronotum nearly three-fourths as long 

 as wide, with three longitudinal carinas, and posterior margin net quite 

 concave in front of scutellum. Elytra strongly veined, very short, reach- 

 ing only to third abdominal segment. Abdomen very long and acutely 

 tapering posteriorly. Male, smaller and narrower than the female, elytra 

 very short, abdomen long and slender, terminated by the very long 

 pygofers. 



Color: Female, straw yellow, frequently unmarked, often with black 

 median spots on anterior and posterior margins of pronotum and apex of 

 scutellum and four on each abdominal segment, arranged in two dorsal 

 and two more lateral rows. Male, darker than the female, vertex tipped 

 with black and with basal black spot as well as with the spots on pro- 

 notum and scutellum, as in the female. 



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

 the preceding, posterior margin slightly produced medially; pygofers re- 

 markably long, their tips divergent below, and fringed with fine hairs. 

 Male, last ventral segment short, about two-thirds as long as preceding, 

 valve very small, triangular, plates nearly as broad at base as last ventral 

 segment, very long and slender apically ; pygofers very long and slender, 

 over four times as long as the plates, divergent below for the greater part 

 of their length, and covered with fine hairs, 



Distributio7i: Reported from Pottawatomie and Hamilton 

 counties. 



Hosts: Aristida purpurea is given as the host plant by Os- 

 born and Ball. 



Genus Hecalus Stal. 



In this genus the females have broad, rather parallel-mar- 

 gined heads which are quite foliaceous but not to the extent 

 seen in the two members of Dorycephalus. The males have a 

 much shorter and pointed head, not at all or much less folia- 

 ceous than in the females. 



One member of this genus has been taken in the state, but 

 two should occur. 



KEY TO SPECIES. 



A. Straw colored forms, rarely striped. hyacteatus. 



AA. Greenish forms, with longitudinal, yellowish or reddish stripes. 



lineatus. 



