OF WASHINGTON. 143 



without opaque on polliuose lines ; humeri and pleurae cinereous polli- 

 nose, the former slightly brassy in certain lights ; scutellum shining 

 black, with black bristles. Abdomen round, shining black, with thin 

 black depressed pubescence becoming thicker on the edges ; venter 

 black. Legs wholly black, femora hairy, tibiae hairy with a few bristles ; 

 pulvilli reddish, claws short. Wings small, hyaline, yellowish or tawny 

 at base, the apical cell petiolate ; tegulae white, hind scale faintly tawny ; 

 halteres yellowish. 



Length of body, 5 mm. ; of wing, 4 mm. 



One specimen. Brookings, South Dakota. From Mr. J. M. 

 Aldrich. Further material will perhaps show specimens with 

 the apical cell closed in the border, not petiolate. 



Ocyptera arcuata Say. This must be known as Wahlbergia 

 arcuata. I had referred it to this genus from the description 

 alone, without examination of specimens. I^ater I received 

 from Mr. Charles Robertson, of Carlinville, 111., two $ $ and 

 two 9 9 that I am able to identify as this species, which has 

 remained unknown since Say described it in 1829. Say's de 

 scription was probably made from a female. The female differs 

 from the male in having the dorsum of the thorax in front 

 blackish in the middle, with the golden pubescence in a broad 

 band on each side ; in the face and sides of the front being 

 silvery ; and in the abdomen being pointed at the extremity, 

 more conspicuously and compactly marked with black, the tip 

 being wholly black above. The male has the thorax in front 

 with golden lines, also in the middle ; the face and sides of 

 front golden ; the abdomen blunt at the extremity, and the 

 segments with the black slightly separated at the sutures. 



O. (Hemyda)aurata Rob. Desv. The genus Hemyda 

 is very distinct from Ocyptera. (See v. Roder, Berl. Knt. 

 Zeitschr., XXV, 212; and Williston, Tr. Am. Ent. Soc., 

 XIII, 297.) 



O. Carolines Rob. Desv. This is very near Walker's dosiades. 

 Desvoidy states that the tegulse are sub-fuliginous, and the 

 thorax dull black tinged with brownish. The tegulse of 

 dosiades are white, and the thorax is shining, polished black. 

 The other characters given by Desvoidy agree well with speci 

 mens which I refer to Walker's species. 



O. dosiades Wlk. I have four $ and three 9 specimens 

 from this vicinity which I refer to this species, though the 

 third antennal joint is scarcely twice as long as the second. I 

 have also one $ from Minnesota (?) and two 9 9 from here, 

 which are smaller, but are likely .the same species. The males 

 have the claws elongate, while in the female they are very 

 short. This seems to be our smallest form of Ocypteia. 



