320 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.43. 



of body. Scutellum with two moderately strong lateral bristles, a long 

 and straight subapical pair, between the last a slightly decussate and 

 very weak apical pair. Both sexes with a very short median discal 

 pair of bristles on second and third abdominal segments, a median 

 marginal very short pair on first segment, a stronger median marginal 

 pair on second segment, and a submarginal row of strong ones on 

 third and fourth segments, the anal segment being without discal 

 bristles. Legs black, claws very short and practically equal in both 

 sexes. Wings clear, tegulae whitish. 



Type.— C&t. No. 15158, U.S.N.M. Female, Piura, April 17, 1911; 

 TD 4035,/. r. s. 



This form is typical of the present genus, the facialia being ciliate 

 about half way up, parafacials much narrowed below, male front 

 much narrower than that of female, eyes bare, apical cell closed and 

 ending distinctly before wingtip. 



Deposits white maggots, probably on host. 



Subfamily J3:R^ClTlSr.^E. 



CH.<^TOSISYROPS, new genus. 



General characters of Sisyropa, but much more bristly and general 

 form broad and robust. Eyes of female densely long-hairy, almost 

 equidistant in front view above and below but slightly wider apart 

 below, descending fully to level of vibrissse; vertex about width of 

 one eye or slightly more, frontal bristles long and descending nearly 

 half way to vibrissal angles (more than two-fifths of the way) ; two 

 proclinate orbital, and three reclinate orbital bristles but slightly 

 inside them, the middle one of latter weaker; a pair of long outwardly 

 proclinate ocellar bristles, nearly as long as orbital but much weaker. 

 Facial plate wide and deeply set, vibrissse on level with oral margin, 

 latter cut off and not at all produced, vibrissal angles widely sepa- 

 rated, facialia bristly about one-third way up, parafacials narrowed 

 below to less than one-half the greatest width of parafrontals. Second 

 antennal joint slightly elongate ; the third heavily developed and wide, 

 three to four times as long as second, usually reaching almost exactly 

 to oral margin. Arista very long, thickened on about basal one-third. 

 Parafrontals hairy, parafacials bare; cheeks fully one-eighth of eye- 

 height; proboscis short and fleshy, with very large labella; palpi 

 elongate, much swollen apically and a little flattened, bristly below. 



Only two sternopleural bristles, four postsutural bristles. Three 

 strong lateral scutellar pairs, one long but weak suberect decussate 

 apical pair, one discal pair nearly same length and strength as apical. 

 Scutellum quite thickly covered with erect rather long bristly hairs. 

 Abdomen short-oval ; one strong median marginal pair of macrochsetaB 

 on first and second segments, and a submarginal row of eight strong 

 ©feet ones on third segment above with others below; shorter erect 



