146 THE UNIVERSITY SCIENCE BULLETIN. 



Hosts: Professor Osborn reports it from Canadian blue 

 grass. 



Deltocephalus signatifrons Van D. 



DeUocei,hahis si'jnntifrons Van D., Trans. Am. Ent. Soc, xix, p. 305, 1892. 

 Deltocephalus signatifrons G. & B., Hemip. Colo., p. 89, 1895. 



Deltocephalus signatifrons O. & B., la. Agr. Col. Exp. Sta., Bui. 34, p. 135, 1897. 

 Deltocephalus signatifrons Osb., Proc. la. Acad. Sci., iv, p. 215, pi. 25, fig. 1, 1897. 

 Deltocephalus signatifrons Van D., Cat. Hemip. N. A., p. 645, 1917. 



Form: Males appearing rather slender, females more robust. Length, 

 3 to 3.5 mm. Vertex slightly sloping, broader than long, obtusely to 

 roundingly produced apically. Pronotum less than twice as broad as 

 long, strongly convex anteriorly, lateral margins very short, humeral 

 margins distinct but rounding with slightly emarginate posterior margin. 

 Elytra usually exceeding the abdomen, but only equalling it in some 

 females, middle anteapical cell distinctly constricted. 



Color: Ashy-gray tinged with fuscous; vertex slightly yellowish, with 

 four large quadrate brown spots on the disc, a pair of smaller and darker 

 ones at the apex and frequently a spot between the latter and the ocelli. 

 Pronotum grayish, mottled with brown and with five faint, light, longi- 

 tudinal lines. Scutellum with basal angles dark and disc irregularly 

 mottled with brown. Elytra with nervures light, in some places milky 

 white, and usually strongly margined with fuscous. Face heavily marked 

 with black arcs and dots. 



External genitalia: Female, last ventral segment a little longer than 

 preceding, lateral angles prominent, posterior margin broadly excavated 

 and bearing two prominent obtusely pointed teeth which are separated 

 by an incision reaching about one-third of the distance to the base; 

 pygofers broad, spiny, and equalling or slightly exceeded by the oviposi- 

 tor. Male, last ventral segment about the length of the preceding; valve 

 broad, short, broadly rounded posteriorly; plates very broad, a little 

 over twice the length of the valve, very widely truncate apically, margined 

 with moderately fine hairs; pygofers short, barely exceeding plates, bear- 

 ing long bristles. 



Distribution: Taken hitherto in four western counties, 

 namely: Decatur, Sheridan, Wallace and Hodgeman. 



Hosts: Gillette and Baker report this species from beans 

 and alfalfa, while Osborn and Ball report it as infesting weedy 

 places. 



Deltocephalus minimus 0. & B. 



Deltocephalus minimus O. & B., Proc. la. Acad. Sci., iv, p. 211, pi. 24, fig. 4, 1897. 

 Deltocephalus minimum Mete, Jl. Elisha Mitchell Sci. Soc, xxxi, p. 24, 1915. 

 Deltocephalus minimus De L., Tenn. St. Bd. Ent., Bui. 17, p. 47, 1916. 

 Deltocephalus melsheimerii Van D., Cat. Hemip. N. A., p. 647, 1917. 



Form: Small and slender. Length, 2.25 to 3 mm. Vertex a little 

 longer than wide in the female, about as long as wide in the male, more 

 rounded apically in the male. Pronotum not quite twice as broad as long, 



