204 THOMAS SAY FOUNDATION 



partly surrounded by two peculiar long, slender proc- 

 esses, widened at their apices, which originate from 

 the back of the segment and project forward; under- 

 neath these are a pair of very distinct slender re- 

 curved hooks. Fifth sternite yellow and shining on 

 the basal part, broadly divided into two large shining 

 black lobes, bare except on inner edge, where they 

 have a brush of short hairs. 



Legs black ; middle femur with comb on the low- 

 er side behind; middle tibia not villous, with two 

 bristles on the outer front side ; hind femur with fairly 

 abundant and long villosity, mostly on the inner side. 



Wings hyaline; no costal spine; third costal seg- 

 ment a little longer than fifth and sixth together. 

 First vein bare; third hairy for a short distance at 

 the base. 



Female. Front .317 of head (average of five, — 

 .308, .308, .319, .319, .332), narrowed at vertex; orbi- 

 tals and outer verticals distinct. Beard and black 

 hairs behind the eye as in the male, one of the best 

 characters for distinguishing this female. Prsc quite 

 small; no apical bristles on the scutellum. Genital 

 segment dark red; the orifice fringed with the usual 

 bristles. Middle femur not with comb; tibia not 

 villous. 



Length 9.5-14 mm. 



Xumerous specimens of both sexes. 15 speci- 

 mens from Washington, D. C, five pairs taken in 

 copulation. These were all collected by Mr. F. Knab 

 in the neighborhood of the Washington Market, close 

 to the National Museum, which would indicate that 

 the species is a scavenger. Four specimens from 

 New York City (Sturtevant) ; two from Miami, Fla. 

 (Knab) ; one, Nyack, N. Y. (J. L. Zabriskie, 1883) ; 

 one Philadelphia (H. Skinner) ; 11 specimens from 

 Mr. Harbeck's collection taken at various places in 

 eastern Pennsylvania; five specimens from Worces- 

 ter, Mass. (S. T. Orton) ; these were labeled sarra- 

 cenice in the National Museum) ; one specimen D. 

 C, collection Coquillett, also named sarracenkc in 



