142 THOMAS SAY FOUNDATION 



No. 63. Sarcophaga angustifrons n. sp. 



Male.- Like excisa except in the following par- 

 ticulars: Front narrower than in any other of the 

 series, averaging .098 of head width (the six males 

 give the figures .090, .084, .096, .120, .085, and .111) ; 

 the narrowest point is at the third frontal bristle; 

 bucca one-fourth the eyeheight; fourth abdominal 

 segment entirely black. Forceps reddish brown, al- 

 most straight on front edge, the hind edge parallel 

 for over half the free length, then approaching the 

 front edge with a diminishing angle of convergence, 

 so that there is a concavity in the profile and the tip 

 seems drawn out and slender; at the extreme tip 

 there is a well-marked tooth on the front side; back 

 of forceps with minute spines on basal two-thirds; in 

 back view the forceps diverge moderately from base, 

 more rapidly near the apex. Accessory plates yel- 

 low, slender and curved; posterior clasper slender, 

 dark brown, curved strongly forward at apex; an- 

 terior clasper stouter and shorter, with a consider- 

 able hook at tip ; penis with yellow basal segment, the 

 distal one black, flat, moderately long, the apical 

 processes spreading U-shaped with the ends twisted 

 outward; between the arms of the U, arising from 

 the pale central mass, is the terminal part, which 

 looks like the head of some little animal with a long 

 snout turned down; on the front or inner side of the 

 distal segment are a pair of disklike, rather soft pads 

 or lobes, surrounded by a harder rim. Fourth stern- 

 ite rather widely open below, the fifth, however, but 

 little visible, bearing only a few hairs and pale pubes- 

 cence. 



Length 8-8V2 mm. 



Six males, Tifton, Ga., September and October, 

 1896 (Hough collection) ; one male, Socorro, N. M., 

 collected by Dr. S. W. Williston in the summer of 

 1916. 



Three females, Tifton, Ga., Oct., 1896, are pre- 

 sumably of the same species. The front measures 

 .28, .299, and .307 of the head; there are the usual 



