16 



PROCEEDINGS OF THE NATIONAL MUSEUM 



VOL. SI 



second; arista with rather short plumosity for less than half its 

 length. 



Thorax gray, with three black stripes and a partial one above the 

 wing extending a little before the suture, the median stripe extend- 

 ing nearly to tip of scutelluni ; at least three pairs of large and some- 

 what irregular anterior and four pairs posterior acrostichals ; sterno- 

 pleural 3; scutellum with three pairs lateral, one discal, the apical 

 pair quite large, subdepressed, decussate. Hind calypter distinctly 

 brownish. 



Abdomen gray with medium black stripe becoming slender on 

 fourth segment, and one less distinct lateral black stripe each side, 

 changeable on third segment and ending at middle of fourth ; a pair 

 of median marginals on second segment, marginal row on third 



and fourth. Genital segments 

 brownish, small; genitalia as in 

 Figure 1. Forceps flattened be- 

 hind, brown basally; outer for- 

 ceps (accessory plate of Parker) 

 rather large for a Sarcophaga. 

 brown basally ; penis verj^ small. 

 In the iigure the anterior and 

 posterior claspers change places, 

 crossing each other at base. 

 Fifth sternite deeply cleft, with- 

 out striking characters. 



Legs black, front tibia with 

 one bristle on hind side; middle 

 tibia with one on outer front. 

 Wings subhyaline, costal segment before first vein equal to the one 

 beyond second ; third vein with bristles extending more than half- 

 way to anterior cross vein. 

 Length, 7 mm. 



Female. — Much grayer, the black thoracic stripes narrower 

 and the median one hardly visible on scutellum. Front near vertex 

 0.29 of head width (four measured 0.29, 0.3, 0.28, 0.28) ; parafacials 

 with fewer setules: abdomen more tessellated, median stripe much 

 less distinct, the lateral hardly noticeable. Second segment without 

 median marginals, at most with depressed bristly hairs. Terminal 

 ventral sclerite yellowish, a little elongated, tapering, slightly curved 

 downward. Posterior dorsocentrals uniformly three. 

 Length, 6 mm. 

 Ty^e.— Male, U.S.N.M. No. 43689. 



Figure 1. — Saroophaga {Blacsoxipha) va- 

 laiigac, new species. Side view of male 

 genitalia with forceps from behind. 

 (Drn^vn by David G. Hall) 



