AET. 1 NEW DIPTERA FROM SOUTH AMERICA ALDRICH 23 



Fertiale. — Front 0.27 of head width; two pairs of j)roclinate orbi- 

 tals. Second abdominal segment with a single pair of median 

 marginals, no discals. 



Described from two males and one female, collected at Perales, 

 Chile, near Santiago, by Rev. Anastase Pirion. 



Ty/je.— Male, Cat. No. 41382, U.S.N.M. 



SELENOMYIA PLENA, new species 



Male. — Like vit^ens, but lacking the green color, and with abdomi- 

 nal markings. Black throughout, only the palpi yellow ; paraf acials 

 brown, but without distinct blackish spot above; calypters white, 

 the rim inf uscated. Chaetotaxy as in virens, but the inner presutural 

 is present; the third antennal joint is bulbous at tip; the dorsal 

 pollinose stripes of the thorax are more distinct, being visible almost 

 to scutellum ; second and third abdominal segments with white pollen 

 except on a broad median shining stripe and the posterior third of 

 each, this pollen extending underneath almost to the middle. Fourth 

 segment with very thin pollen on same portions. Second segment 

 with one cliscal and one median marginal pair, third with one discal 

 pair and marginal row. Gentalia black ; the united inner forceps awl- 

 shaped, the tip blunt, rounded, and turned back; outer forceps 

 slender and pointed, not platelike. Front 0.24 of head width. 



Described from one male, collected by D. S. Bullock at Angol, 

 Chile, January 2, 1927; and a male and two females collected by 

 Edwards at Concepcion, Chile; PeuUa, S. Chile; and Lake Nahuel 

 Huapi, Rio Negro, Argentina. 



Type.—M^lQ, Cat. No'. 41383, U.S.N.M. 



SELENOMYIA FACIALIS, new species 



Feinale. — Front 0.26 of head width; only one pair of proclinate 

 orbitals, which are high up and almost in the frontal row ; the upper- 

 most frontal small and turned outward (it is broken off in the female 

 of virens, so I can not compare the direction and no other females 

 are known) ; parafrontal and parafacial gray-brown pollinose, with- 

 out distinct spot at antennae. Palpi brown; facial ridges on the 

 convergent lower part not so bristly as in virens; arista pubescent; 

 beard pale yellow except anteriorly; chaetotaxy and thoracic stripes 

 as in virens. Abdomen black, almost covered with thin gray pollen, 

 subshining in some lights, hind edges of segments shining; second 

 segment with a marginal pair, third with marginal row, both with 

 only a few stouter hairs in place of discals. Calypters white, the 

 rim infuscated only on inner side. Legs as in virens., but the front 

 tibia has a single outer bristle, and the hind one has a trace of reddish 

 color on the middle. Wing as in virens. 



