No. 2301. NEW 8PEGIES OF MVSCOID FLIES—TOWNSEND. 567 



OESTROPLAGIA PETIOLATA, new species. 



Length, 6 mm. One male, Sabino Basin, Santa Catalina Moun- 

 tains, Arizona, 3,550 feet, October 12, 1918, on flowers of Baccharis 

 sarothroides Gray (C. H. T. Townsend). 



Black. Head very faintly grayish, frontalia brown; second 

 antennal joint and base of third rufous; palpi fulvous. Body lead- 

 gray poUinose; four black equal thoracic vittae; first abdominal 

 segments, subobsolete median hue, and irregular hind borders of last 

 three segments black; nearly the posterior half of anal segment black- 

 ish. The black of intermediate segments changes with varying light, 

 running forward on sides in oblique view. Legs black. Tegulae 

 white. Wings clear; the veins black. 



Type.— Cat. No. 22088, U.S.N.M. 



VIBRISSOVORIA, new genus. 



Genotype. — Vibrissovoria petiolata, new species. 



Clypeus long, considerably sunken. Epistoma narrow, rather 

 long, strongly warped. Facialia ciliate over halfway. Proboscis 

 short; palpi long, stout, bowed. Second antennal joint long; third 

 hardly twice second. Arista bare, short, thickened nearly to the 

 sharp tip; second joint over half third. Eyes bare. Male frontals 

 in two rows, three bristles below base of antennae. No proclinate 

 fronto-orbitals in male. Ocellars present, perhaps rechnate (injured). 

 ParafaciaHa wide, bare. Cheeks one-fourth eye length. Three 

 sternopleurals, postintraalars, preacrostichals, postacrostichals, and 

 lateral scutellars; four postsuturals. A very weak divaricate apical 

 scutellar pair. Costal spine moderately long. Third vein bristled 

 only at base; others bare. Apical cell petiolate, ending well before 

 tip; petiole as long as small crossvein. Posterior crossvein in middle. 

 Last section of fifth vein over one-third preceding. No median 

 marginals on first segment; median marginal pair on second; marginal 

 row on third and anal segments. 



VIBRISSOVORIA PETIOLATA, new species. 



Length, 8 mm. One male, Balboa Prado, Canal Zone, Panama, 

 July 2, 1918, G 32d (H. F. Dietz). 



Blackish, gray poUinose. Face and front silvery. Thorax silvery, 

 leaving four equal black vittae, the two of each side convergent 

 behind suture. Scutellum thinly silvery; more so on tip. Ab- 

 dominal segments thinly silvery, except hind margins and median 

 line. Anal segment mostly reddish; sides of second segment faintly 

 reddish. Wings clear. Tegulae white. 



Type.—€at. No. 22085, U.S.N.M. 



