No. 2301. NEW SPECIES OF MV8C0ID FLIES— T0WN8END. 585 



Tribe BIGONICHETINI. 

 PACHYNOCERA, new genus. 



Genotype. — Pachynocera petiolata, new species. 



Clypeus moderately sunken. Epistoma cut off short, the edge 

 bulged. Facialia bare. Proboscis little over half head height; palpi 

 well widened. Third antennal joint of male five or six times second 

 and swollen. Arista rather short, bare. Eyes bare. Front wide 

 and short; male vertex fully one-thhd head width. Two frontals 

 below base of antennae. Row of five to seven proclinate fronto- 

 orbitals in male. Ocellars present. Parafacialia narrow, with row 

 of six to eight strong facio-orbitals. Cheeks two-fifths eye length. 

 Two lateral scutellars; three sternopleurals, postintraalars, postsu- 

 turals, preacrostichals, and postacrostichals ; rather long decussate 

 apical scutellar pair. First vein bristled about two-thirds way to 

 tip; third vein bristled to point about opposite hind crossvein; 

 fifth vein bare. Apical cell petiolate, the petiole longer than small 

 crossvein to over twice same, ending considerably before tip. Hind 

 crossvein in middle or nearer to small crossvein. Male claws and 

 tarsi short. No median marginals on first segment, but a pair on 

 second; marginal row on last two segments. 



PACHYNOCERA PETIOLATA, new species. 



Length, 6 mm. Two males, Rio Charape, Jaen Province, Peru, 

 4,500 feet, September 12 and 13, 1911 (C. H. T. Townsend). 



Shining black, with a faint metaUic greenish tinge, more or less 

 thinly silvery. Palpi fulvous. Antennae blackish, the base nar- 

 rowly rufous. Frontaha brown. Face and sides of front rather 

 thinly silvery, with blackish reflections in varying fight. Thorax 

 thinly silvery, more thickly so before suture and on pleura; with four 

 indistinct black vittae, the inner and outer of each side approximated 

 and without pollen between. Abdomen thinly silvery on basal half 

 of anal segment and less than basal half of intermediate segments. 

 Legs black. Wings fuscous on narrow costal border. Tegulae 

 tawny-whitish. 



Type.— Csit. No. 22248, U. S. N. M. 



XANTHOACTIA, new genus. 



Genotype. — Lasioneura palloris Coquillett, 1895.^ 



Differs from GymnopUhalma as f oUows : First vein bristled only on 

 about the distal third. Third vein bristled more or less fully nearly 

 to tip. Fifth vein entkely bare. Apical cell open to nearly or quite 

 closed, ending in tip. Weak appressed marginal row on first seg- 

 ment; nearly complete marginal row on second, of which middle pair 



1 Journ. N. Y. Ent. Soc., vol. 3, p. 50. 



