TAXONOMY OF MUSCOIDRAN FLIES — TOWNSEND 1 15 



latter overlapping' sides of former, and a sixth ventral plate, or 

 sclerite appearing as such, at base of ovipositor. The latter bears 

 only hairs. The male with second and third ventral plates bearing 

 thick bunches of spines as in female, but fourth with only hairs and 

 free, the ventfal membrane showing widely on sides of fourth only ; 

 fifth ventral plate much narrower, longer than wide, bare, not free; 

 what seems a sixth ventral plate in female represented in male by a 

 paired process articulating with the hypopygium. 



EUEPALPUS, gen. nov. 



Differs from E pal pus in having third antennal joint elongate and 

 convex in profile on anterior edge, front and epistoma much less 

 prominent, face less deeply concave in profile. Eyes absolutely 

 bare. Parafacials very wide, black-hairy. Cheeks about equal to 

 eye height. Second aristal joint hardly twice as long as wide. 



Differs from Xanthozona (type, melanopyga Wiedemann) in hav- 

 ing no discal macrochsetse on abdomen. 



Type, the following species (to be figured in the forthcoming new 

 edition of Dr. S. W. Williston's Manual of Diptera, fig. 156). 



Euepalpus flavicauda, sp. nov. 



One female, Brazil, April, H. H. Smith, Coll. Received from Dr. 

 S. W. Williston. 



Length, 15 mm. Black; face, cheeks, and beard silvery white. 

 Frontalia and parafrontals blackish, quite concolorous. Antenna? 

 and arista brown. Thoracic scutum metallic black with greenish 

 tinge, thinly silver}' pollinose, more thickly so on anterior edge, 

 humeri, and pleura?. Scutellum and abdomen metallic brown with 

 a hardly purplish tinge, the anal segment with a conspicuous sub- 

 triangular (from above) yellow area defined by the discal row of 

 macrochaetse and extending under so as to narrowly surround the 

 genital opening. A comb of median marginal thorn-like macro- 

 chaeta? on ventral segments, and discal row on ventral side of anal 

 segment. A single lateral marginal macrochaeta on first and second 

 segments, two median marginal pairs on second, a marginal row of 

 ten on third, the discal row on anal ; and only a row of weak bristles 

 on posterior edge of anal, appearing like bristly hairs compared with 

 the other macrochaetae. Legs brown or blackish; claws and pulvilli 

 rufous yellow, tips black. Wings entirely and evenly infuscate. 

 tegulae decidedly smoky. 



Type— Cat. No. 11,806, U. S. N. M. 



