Dec, I9I5-] Townsend: New Muscoidea. 225 



slender, claws very short. Costal spine small, third vein with one 

 bristle, at base, cubitus nearer wing-margin, hind crossvein nearer to 

 small crossvein; wings not quite so shortened. 



Phasiostoma aristalis new species. 



Length of body, 3.5 to 4.5 mm. ; of wing, 3 to 4 mm. Six males as follows : 

 Pecos, June 2 CCkll.) and August 21 (W. P. Ckll.) ; Beulah, July 15 and 

 August (Ckll.) ; Sante Fe, July (Ckll, 3865) ; and Las Vegas Hot Springs, 

 August 19 (H. S. Barber), all in New Mexico. 



Testaceous, ashy to silvery pollinose. Face silvery ; front, thorax and 

 scutellum cinereous; abdomen silvery on narrow bases of segments, thinly 

 ashy on rest. Legs testaceous to flavotestaceous, tarsi black. Wings clear, 

 tegulas pearly-white. Antennae black. Palpi nearly concolorous with legs. 

 Frontalia pollinose, showing tawny-flavous in oblique view, blackish in middle 

 by direct view. 



Holotype, No. 19621 U. S. N. M., Pecos, June 2. 



PHANTASIOMYIA new genus. * 



Genotype, Phantasiomyia gracilis Townsend new species. 



Differs from Phasiostoma as follows : Male. — Vertex about one 

 third of head width; face not constricted, fully one half head width 

 below. Eyes thinly hairy; no outer vertical, only one reclinate and 

 one or two proclinate fronto-orbitals, frontals descending about to 

 arista. Two pairs of weak ocellars; microchsetse of parafrontals 

 descending lower than frontals. Frontalia broader than one para- 

 frontal. Facial depression broad, long; the faciaha not flattened to 

 parafacial level, ciliate about one third way up. Epistoma only 

 slightly prominent, of the arcuate type but well cut off and but little 

 projected. Proboscis shorter. Antennae much elongated, the second 

 joint short; third joint six or seven times as long as second, heavy, 

 subequilateral, rounded-subtruncate at tip. Arista long, the second 

 joint well elongated but only one fourth or one fifth the length of 

 third, the latter tapered at tip. Head subrectangular in profile, the 

 oral and vibrissal axes equalling the antennal axis. Three sterno- 

 pleurals. No complete marginal row of strong macrochjetse on third 

 segment. Wings rather longer, costal spine completely atrophied, 

 third vein bristled over half way to small crossvein. Cubitus removed 

 from margin, hind crossvein only slightly nearer to cubitus than to 

 small crossvein. Tarsi rather heavier, gently tapering to tips. 



