SARCOPHAGA AND ALLIES 63 



two pairs of processes at front angle, — the inner 

 short black, pointed, and the outer flattened and some- 

 what hooked. Fifth sternite very delicate, entirely 

 concealed. 



Legs rather stout, the coxse, tarsi, and the basal 

 part of the femora black, the tibiae and apical third to 

 half of the femora reddish yellow; middle femora 

 without comb; middle tibia with one bristle on outer 

 front side; hind tibia without villosity. 



Wings hyaline ; no costal spine ; third costal seg- 

 ment about three-fifths of the fifth; hind crossvein 

 rather straight. 



Female. Front .29 of the head, genital segment 

 red, not distinctly visible in the described specimen. 



Length, 6 mm. 



Two males and one female: one male Havana, 

 Cuba, col. C. F. Baker, in collection of author; one 

 male and one female, Nassau, Bahamas, Dec. 15, 

 1912, col. F. Knab, in the U. S. National Museum. 



Holotype.— Female, No. 4,374, U. S. N. M., 

 from Porto Rico. 



The Havana specimen was compared with Co- 

 quillett's type female in the National Museum; the 

 only discrepancy is the silvery face instead of golden. 

 Males from the type locality (Porto Rico) will prob- 

 ably be necessary to determine the value of this char- 

 acter; in some species it appears to be of importance. 



The striking similarity of the genitalia of males 

 of this species and Camptops unicolor will be appar- 

 ent from a comparison of the figures. 



THELODISCUS New Genus. 



{dyfkvs, immature; dlaKos, disk) 



Frontal bristles of male descending to base of 

 second antennal joint, rather evenly diverging from 

 above the middle of the front; vibrissce a little above 

 the oral margin; scutellum with three pairs of mar- 

 ginal bristles ; middle pair are as close together as the 

 subapical and might be regarded as apical bristles but 



