216 THE CANADIAN ENTOMOLOGIST. 



DESCRIPTION OF A NEW SPECIES OF DORYCEPHALUS. 



BY HERBERT OSBORN, AMES, IOWA. 



Dorycephalus platyrhynchus, n. sp. 



$ — Head produced and very flat, rounded in front, wings reaching 

 tip of abdomen ; colour gray-brown. Length, 9 mm. Length of head, 

 2.3 mm. 



Head thin foliaceous, margins very thin, a median, thicker space, 

 which beneath widens to base of head, forming a convex keel. Eyes 

 touching prothorax. Ocelli on margin of head, just in front of eyes, a 

 rather obscure mottling of brown along the disk of the head and forming 

 a rather distinct median stripe, a dark stripe under the tip of the head, 

 dividing and passing along the margins of the keel, a distinct blackish 

 line under the eye, and extended as a brownish stripe on thorax. Pro- 

 thorax transverse, with five slightly elevated convex ridges, the anterior 

 margin nearly straight, with slight sinuosities, the posterior margin concave 

 in front of the scutellum. Scutellum wider than long, convex in front, 

 with an acute point at the apex between bases of elytra, with a transverse 

 furrow behind the middle, deflected laterally. Elytra strongly veined, 

 costal margin arcuated, with a humeral furrow, very minutely punctate. 

 Legs rather slender, anterior femora fuscous beneath. Middle and 

 posterior femora with rows of fuscous dots forming a stripe beneath. 

 Tibiae fuscous beneath. 



Described from two male specimens, one collected at Ames, Iowa, by 

 Prof C. P. Gillette, the other collected at West Point, Nebraska, by Prof. 

 Lawrence Bruner. 



Female larger than male ; pale yellow, with dark median line on head 

 and prothorax. Length, 14.5 mm. Head longer than in male, central 

 carina above darker. Elytra short, reaching one-half way on to the 4th 

 segment of the abdomen. Wings shorter, reaching nearly to posterior 

 margin of the 2nd segment of the abdomen. Abdomen elongate and 

 acuminate. First 6 segments about equal in length ; 7th narrow, elon- 

 gate and combining with remaining segments to form the sheath of ovi- 

 positor. Ovipositor long, the sheath simple beginning at the 5th ventral 

 segment. 



Since forwarding the description of the male a special student in ento- 

 mology, Mr. E. D. Ball, has brought in another male and the female here 

 described. 



The larger size and elongate, slender abdomen gives this quite a 

 different appearance from the male, but I think there can be no question 

 as to the identity of the two forms. The specimen in hand has somewhat 

 the appearance of being fresh from the pupa stage, on account of the 

 lighter colour and soft appearance of the body, but the wings appear fully 

 developed, and in other respects it indicates maturity. 



