32 PROCEEDINGS OF THE NATIONAL MUSEUM vol.83 



Female. — Front rather narrow, at extreme vertex 0,26 of the head 

 width (one specimen) ; parafacial at narrowest about as wide as 

 third antennal segment; cheek barely one-third the eye height. 

 Infrasquamal hairs present; calypters with rims pale tawny. Abdo- 

 men without defined silvery basal bands on last three segments ; first 

 thinly gray pollinose above and on sides ; intermediate segments with 

 the pollen extending thinly beyond the middle when viewed from 

 behind; anal segment almost entirely gray pollinose, without discal 

 bristles; venter largely covered with gray pollen. Legs brownish 

 black. Wings with a distinctly yellow tinge on costal margin and 

 along the veins, hind margins grayish hyaline; apical cell closed at 

 costa, not petiolate; costal spine about as long as small cross vein; 

 epaulets reddish black. 



Length. — 7.5 mm. 



Male. — Unknown. 



ry;?e.— Female, U.S.N.M. no. 15147. 



Remarks. — Redescribed from one paratype female from Sullana, 

 Peru, October 1, 1910, TD 3942 (C. H. T. Townsend) . In the United 

 States National Museum there are three additional female type 

 specimens from the same locality and one female from Piura, Peru, 

 all collected by Dr. C. H. T. Townsend. 



The narrower cheeks and parafacials and the absence of discal 

 bristles on the fourth abdominal segment readily separate the species 

 from P. singularis. 



(17) PARADIDYMA PILIVENTRIS, new species 



Distinguished from all others of this group by the presence of pale 

 hairs on venter of abdomen. 



Female. — Front at vertex 0.29 and 0.27 of the head width in the 

 two specimens ; paraf rontals black, thinly gray pollinose, with more 

 numerous black hairs on the lower part extending on the parafacials 

 about to level with arista; outer verticals not developed; ocellars 

 proclinate ; orbitals two proclinate pairs ; f rontals about six in num- 

 ber, distinctly larger than parafacial bristles, uppermost pair rather 

 stout and reclinate, the others directed inward descending below mid- 

 dle of second antennal segment ; face blackish, gray pollinose, mod- 

 erately receding and concave above mouth in profile ; facial ridges not 

 very prominent, bearing bristly hairs on about the lowest fourth; 

 parafacials largely black, covered with satiny gray pollen, a row of 

 bristles along the reddish inner margin, outside of these bare on 

 lower half; antennae shorter than face, wholly black, third segment 

 narrowed toward base and about two and one-half times the length 

 of second ; arista black, thickened on proximal fourth, basal segments 

 short ; vibrissae near the front edge of the mouth ; cheeks two-fifths 

 the eye height; eyes distinctly hairy; palpi black, bearing several 



