SARCOPHAGA AND ALLIES 271 



Abdomen gray pollinose, tessellated ; fourth seg- 

 ment largely black, only the apical third to half red; 

 forceps dark yellow, tips blackish; viewed from be- 

 hind they are somewhat widely separated and taper 

 to a sharp point ; viewed from the side they are rather 

 straight, the terminal part quite thin, with a sharp 

 tip bending slightly forward; accessory plate yellow, 

 large, subtriangular, but the basal angles consider- 

 ably rounded ; posterior clasper yellow, slender, erect, 

 hooked forward at tip ; anterior clasper very stout at 

 base, yellow with brownish tip which is rather wide 

 and thin, sharp, but not much hooked; penis yellow, 

 the apical part brown; its structure is quite simple 

 except for the striking and characteristic modifica- 

 tion of the transverse front plate. In this case the 

 plate, arising near the middle of the front side, bends 

 apically and divides, the two tips curving toward the 

 base and widely diverging, and bordered all the way 

 along the front by a very distinct fringe of short 

 spines; thus in the side view the plate is something 

 the shape of S but when viewed from in front it is 

 more like a W. The fifth sternite is dark yellow, 

 deeply cleft, not divergent, but the arms do not stand 

 out prominently as in most of the species of this 

 group. 



Legs black. 



Female. Front .303 of head (average of five, — 

 .296, .300, .304, .307, .310); parafrontals and para- 

 facials gray, the former with a slight tinge of yellow. 

 Scutellum without apical bristles ; middle femur with- 

 out comb; genital segment red. 



Length 5-7 mm. 



Fifteen males and seven females. Twelve males 

 and all the females are from Plavana, Cuba, collected 

 by Professor C. F. Baker (Aldrich) ; one male from 

 Nassau, Bahamas, December 14, 1912, collected by 

 Frederick Knab (U. S. N. M.) ; one male Chapada, 

 Brazil, collected by H. H. Smith and presented to 

 me by Professor WilHston; one male, Ecuador, col- 

 lected by H. A. Parish, in mv collection. 



