586 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. 56. 



is erect; last two segments with erect marginal row, no discals on 



anal segment. Three sternopleurals, postintraalars, preacrostichals, 



postacrostichals and lateral scuteUars ; four postsuturals ; short apical 



scuteUar pair. The disk of scutellum shows a short pair and is 



evenly set with michrochaetae surrounded by a conspicuously wide 



bare margin. 



APHANTORHAPHA, new genus. 



Genotype. — Aphantorhaplia arizonica, new species. 



Clypeus slightly depressed. Epistoma very short, slightly warped. 

 Facialia bare. Haustellum three-fifths of head height; palpi small, 

 widened at tip. Third antennal joint of male thick, about four 

 times second. Arista short, thickened nearly to the sharp tip; 

 second joint one-fourth as long as third. Eyes bare. Frontals in 

 straight line, one below base of antennae. Two prochnate fronto- 

 orbitals in male. Parafacialia very narrow, bare. Cheeks one- 

 third eye length. Thoracic suture extinct throughout. Three 

 sternopleurals, postintraalars, postsuturals, and lateral scutellars; 

 preacrostichals and postacrostichals present; a microscopic nonde- 

 cussate apical pair. Third vein bristled in about four bristles to 

 small crossvein; others bare. Apical cell almost closed just before 

 tip. Posterior crossvein straight, nearer to small crossvein. Last 

 section of fifth vein over half as long as preceding section. No 

 median marginals on first segment, but a pair on second; marginal 

 row on third and anal segments. 



APHANTORHAPHA ARIZONICA, new species. 



Length, 3 mm. One male, Horseshoe Canyon, Chiricahua Moun- 

 tains, Arizona, 6,000 feet, July 31, 1917, on flowers of Ceanothus 

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



Head very pale fulvous, thinly whitish poUinose. Frontaha ful- 

 vous. Antennae and arista black. Palpi pale yellowish. Thorax 

 and abdomen brownish, thinly poUinose, rather shining. PoUen of 

 mesonotum and abdomen with a brassy tinge, that of pleura less so. 

 Median vitta and hind borders of abdominal segments brownish, 

 shining. Legs brown or blackish. Wings clear. Tegulae tawny. 



Type.—C'dt. No. 22212, U.S.N.M. 



TRICHOTOPTERYX, new genus. 



Genotype. — Tricliotopteryx tropica, new species. 



Clypeus gently sunken. Epistoma short, weU warped. Facialia 

 bare. Proboscis short and stout; palpi widened at tip. Third an- 

 tennal joint three and one-half times second. Arista finely pubes- 

 cent; second joint twice as long as wide. Eyes nearly bare. Fron- 

 tals stopping at base of antennae. Two proclinate fronto-obitals in 

 male. OceUars present. Parafacialia bare. Cheeks nearly one- 



