No. 2301. NEW SPECIES OF MU8C0ID FLIES— T0WN8END. 569 



before tip. Hind crossvein nearer to cubitus. Male tarsi and claws 

 long; median marginal pair on first segment, median marginal pair 

 or marginal row on second; median discal pair on second; marginal 

 row on last two segments; median discal pair or discal row on third; 

 discal row on anal. 



LEPTOMACQUARTIA PLANIFRONS, new species. 



Length, 6.5 to 7 mm. Three males, Matucana, Peru, 8,000 feet, 

 January 30 and August 16, 1913, on foliage (C. H. T. Townsend). 



Head black, thinly silvery on face and sides of front. Antennae 

 and palpi blackish; frontaha dark brown. Thorax black with faint 

 metallic bluish tinge; silvery on humeri, pleura, and middle of 

 prescutum; with four brown vittae, the outer heavy and confluent 

 anteriorly with the inner. Abdomen blackish, faintly metallic 

 greenish, thinly silvery laterally on bases of segments, the pollen 

 extending across segments in oblique view. Legs black. Wings 

 narrowly brown on costa. Tegulae whitish. 



Type.— Cat. No. 22246, U.S.N.M. 



Tribe HYALTJUGmi. 

 XANTHOCERA ATRA, new species. 



Length, 4.5 mm. (abdomen arched). Two females, Alto Pass and 

 Dubois, Illinois, May 7 and 21, 1917 (J. R. Malloch). 



Differs from clistoides Townsend as follows: Abdomen wholly 

 polished black, without sign of pollen. Thorax and scutellum 

 shining black, but with faint indications of thin pollen coat in oblique 

 view. Front a little ^\dder, and clypeus not quite so depressed. 

 No weak apical pair of scutellar bristles. Femora shining black to 

 brown-black. 



Type.— Csit. No. 22270, U.S.N.M. 



Tribe LYDELLnil. 

 AUBAEANETIA, new genus. 



Genotype. — Aubaeanetia assimilis, new species. 



Clypeus moderately sunken. Epistoma cut off, not warped. 

 Faciaha ciliate at most about one- third way. Proboscis a little 

 over half head height; palpi about as long as haustellum, a little 

 widened at tip. Third joint of antennae in male about three times 

 second and stout; in female twice second and not stout; in both sub- 

 mucronate. Arista short-pubescent. Three frontals below base of 

 antennae. Two proclinate fronto-orbitals in both sexes. Ocellars 

 strong. Parafacialia bare. Cheeks over one-fourth eye length. 

 Two preacrostichals and postacrostichals ; three sternopleurals, post- 

 intraalars, postsutm^als and lateral scutellars; very weak apical 

 scutellars. Costal spine strong. Third vein bristled about one- 



