TAXONOMY OF MUSCOIDEAN FLIES TOWNSEND 95 



was described was all collected by the writer in the White Mountain 

 region of New Mexico (not New Hampshire, as given in the Cata- 

 logue), at about 8,000 feet, on the head of Eagle Creek, a stream 

 which takes its rise on the upper slopes of the peak known as Sierra 

 Blanca (altitude, 10,050 feet). 



TREPOPHRYS, gen. nov. 



Head in profile almost half round. Antennae inserted about at 

 eye middle. Front flattened, rounded in profile, showing just the 

 same width beyond eye margins as do parafacials. Eyes bare, reach- 

 ing quite to vibrissas. Cheeks very narrow, not over one-tenth of eye 

 height. Front about one-third of head width, or slightly less, the 

 inner outline of eyes but slightly divergent below base of antennae. 

 Parafrontals a little wider than frontalia, parafacials gradually 

 narrowing from base of antennae until they become almost linear 

 at lower eye margin. Ptilinal suture inverted V-shaped, the median 

 angle a little rounded. Ptilinal area elongate, about one-third head 

 width below. Facial plate elongate, not narrowed below, depressed, 

 with a distinct and sharp but low median carina full length, not 

 produced at lower margin. Facialia edge-like, bristly more than 

 half way up, vibrissal angles hardly perceptible. Vibrissae inserted 

 close to oral margin, well developed. 



Frontal bristles in a single row close to frontalia and extending 

 back to ocelli, all curved inward, more or less decussate, descending 

 in front to insertion of arista. The usual strong inner and weak 

 outer vertical bristles. Two upper reclinate fronto-orbital bristles 

 set well forward, almost far enough forward to occupy the usual 

 place of insertion of the middle or proclinate ones. These two 

 fronto-orbital bristles are of exactly the same strength, length, 

 curvature, and direction as the inner vertical bristle, and look like 

 two replicas of it in profile. They are also quite in line with it, and 

 the three in profile are seen to be an equal distance apart. Two 

 proclinate middle fronto-orbital bristles in female, outside the upper 

 ones ; none in male. 



Proboscis short and fleshy, palpi slender and normal. Second an- 

 tennal joint about twice as long as first; arista indistinctly jointed 

 and minutely pubescent, slightly thickened on basal one-third. Third 

 antennal joint about two and one-half times as long as second. 

 Occiput slightly swollen behind on lower one-fourth, the lower mar- 

 gin of head short, long axis of head at vibrissae but little over one- 

 half that at base of antennae. 



Three sternopleural bristles, 1. 1. 1, the middle one weakest, the 

 posterior one strongest. Three postsutural bristles. Scutellar 

 7 



