No. 2S01. NEW SPECIES OF MUSCOID FLIES— TOWNSEND. 551 



HESPERODINERA, new genus. 



Genotype. — Hesperodinera cinerea, new species. 



Differs from Dinera as follows: Not so narrowed in form. Facial 

 carina obliquely lowering and extending to epistoma. Haustellum 

 about two-thirds head height. Palpi nearly twice as long as antennae. 

 Antennae inserted well below eye middle. Female vertex about 

 one-third head width. Female frontalia well over half as wide as 

 one Parafacial. Two proclinate ocellar pairs. Parafacialia a little 

 wider than clypeus, well setose. Cheeks three-fifths eye length. 

 Three postintraalars. Third vein bristled only at base. Apical cell 

 petiolate well before tip, petiole nearly or about as long as small 

 crossvein. No stump at cubitus. Abdomen rather broad ovate. 

 Strong median marginal pair on first two segments, median discal 

 pair on intermediate segments, strong marginal row on third, strong 

 discal and rather strong submarginal rows and weak marginal and 

 anterior rows on anal segment. 



HESPERODINERA CINEREA, new species. 



Length, 7 mm. One female, Harvey's Ranch, Pecos National 

 Forest, New Mexico, 10,000 feet, August 22, 1916 (C. H. T. Townsend). 



Blackish, thickly yellowish-cinereous poUinose. Cheek grooves 

 reddish-brown in obUque view. Frontaha light brown. Antennae 

 soft black, second joint pale on distal edge. Palpi fuscous. Five 

 blackish thoracic vittae, moderately distinct, the inner pair narrow 

 and approximated to the median vitta. A pair of indefinitely sub- 

 triangular dark spots showing in oblique view on second and tliird 

 abdominal segments. Legs blackish. Wings clear. Tegulae 

 yellowish-white. 



This species was determined by Coquillett as Myocera rava Wulp, 

 but that species has the apical cell open. 



Type.—Csit. No. 22215, U.S.N.M. 



Tribe THEBESHNI. 

 SCHISTOSTEPHANA, new genus. 



Genotype. — Schistostephana aurifrons, new species. 



Differs from Gymnohasis as follows: Form somewhat more nar- 

 rowed. Clypeus equilateral, fully twice as long as wide. Epistoma 

 strongly warped, subnasute, at 45 degrees from profile of carina. 

 Two verticals in male, the outer one very short. Male frontalia very 

 wide and deeply arcuate at anterior end. Many proclinate-divergent 

 pairs of ocellars, thickly placed and all same length, ordinarily from 

 8 to 12 pairs evenly divaricate like hair parted at the crown of the 

 head. 



