AKT. 19 AMERICAN MUSCOID FLIES ALDRICH 3 



facial and cheek with dense grayish-white pollen slightly tinged with 

 yellow above. The parafrontals bare except for a few small hairs 

 above, each a little wider than the dark brown middle stripe on the 

 upper part. Frontal bristles only about six, reaching the base of 

 antennae ; two large proclinate orbitals and one reclinate above them 

 not distinctly connected with the frontal row; ocellars krge, pro- 

 clinate and divergent. Front not prominent, the antenna 1 axis only 

 as long as the vibrissal; cheek nearly half the eye height, with a red- 

 dish streak from the eye to the mouth, back of which are a few small 

 black hairs. Vibrissae a little above the oral margin, with several 

 rather large bristles below them and a few small bristles immediately 

 above; facial ridges bare. Antennae dark red, third joint narrow, 

 about four times the second, with long-plumose arista; second joint 

 with a long curved bristle over the arista ; palpi yellow, of ordinary 

 size, proboscis also ordinary. Back of head with rather sparse hair 

 which is dark except close to the neck; parafacial almost equalling in 

 width the entire clypeus. Thorax with dense grayish-yellow^ pollen 

 and four black stripes, the two iimer narrow in front. Scutellum 

 black at base, the rest densely yellowish-gray pollinose. Chaetotaxy : 

 Acrostichal 1 or 2, 2 ; dorsocentral 3, 4 ; humeral 3 ; posthumeral 2 or 

 3; presutural 1; notopleural 2; supraalar 3; intraalar 3 (the two an- 

 terior small) ; postalar 2; scutellum with two pairs of laterals and one 

 equally large apical, and one pair of discals. Sternopleural 2, 1; 

 post-scutelluni well developed, with yellow pollen. Calyters of 

 ordinary size. 



Abdomen with the first three segments velvety brownish-black, the 

 basal third or more of the second and third segments more shining 

 and with a trace of thin, white pruinosity, not tessellated; fourth 

 segment red, slightly blackish in the middle above, the sides densely 

 yellowish pollinose to the venter, but the pollen does not include the 

 posterior part where the bristles arise. First abdominal segment 

 without median marginals, second with one pair, third with a 

 marginal row, the middle two pairs stout, fourth with a marginal 

 row somewhat smaller, no discals on any of the segments. Legs 

 black, front tibia with one outer bristle, mid tibia with two on outer 

 front side, two on outer hind side, and one flexor. Hind tibia Avith 

 three on outer hind side, two on inner hind, one on outer front 

 Wing densely infuscated along the middle and costa, paler behind 

 and in the larger cells. Fourth vein beyond the cross vein bent a 

 little back toward the hind margin, the angle slightly acute, with 

 a short but distinct appendage, thence with a little concavity to the 

 margin distinctly before the apex. First vein bare, third with four 

 or five bristles at base. 



Length, 11 and 13 mm. 



