No. 2301. NEW 8PECIE8 OF MU8C0ID FLIES— T0WN8END. 577 



and are stronger in the male, which, besides, has anal segment well 

 covered with long erect bristles. 



OLLACHEA ELONGATA, new species. 



Length, 7 to 8 mm. Two males and one female, OUachea, Peru, 

 9,500 feet, February 2, 1910, on flowers of Buddleia sp. (C. H. T. 

 Townsend). 



Blackish-brown, rather thickly brassy-cinereous poUinose. Palpi 

 fulvous. Antennae black. Frontalia deep brown. Mesoscutem 

 with two broad heavy blackish-brown vittae widened inwardly just 

 behind suture, where they are more or less confluent; notched out- 

 wardly at suture, with an outer prong narrowly following suture 

 behind, which is more distinct in the male. Scutellum brownish on 

 disk, especially in the male. Abdomen with broad median vitta of 

 brown, much widened on first segment, narrowly following hind 

 borders of first three segments laterally. Wings nearly clear. Tegu- 

 lae glassy, smoky-yellowish. 



Type— Csit. No. 22258, U.S.N.M. 



OPSOMEIGENIA, new genus. 



Genotype. — Hypostena pusilla Coquillett, 1895.^ 



General Meigeniine characters. Epistoma cut off short, not 

 warped. Facialia bare. Eyes bare. One frontal below base of 

 antennae, or at times two in male. Ocellars present. Parafacialia 

 bare, moderately narrow, strongly narrowed below in female but less 

 so in male. Two to three preacrostichals; three sternopleurals, post- 

 in traalers, postsuturals, postacrostichals, and lateral soutellars; no 

 apical scuteUars. Third vein bristled only at base; others bare. 

 Apical cell narrowly open just before tip. Hind crossvein in middle. 

 Male claws rather long. Median marginal pair on first two segments; 

 median discal pair on intermediate segments in both sexes and on 

 anal in female; marginal row on last two segments, discal row on 

 anal in male. 



MACHAIROMASICERA, new genus. 



Genotype. — Machairomasicera carinata, new species. 



Clypeus gently sunken. Epistoma short, scarcely warped. Fa- 

 cialia finely ciliate nearly haKway. Proboscis short; palpi stout. 

 Third antennal joint over three times second in female. Arista long, 

 bare. Eyes thinly pilose. Female vertex one-fourth head width. 

 Two frontals below base of antennae. Two proclinate fronto-orbitals 

 in female. Ocellars weak. Parafacialia narrow, bare. Cheeks about 

 one-fifth eye length. Three sternopleurals, postintraalars, post- 



1 Journ. N. Y. Ent. Soc, vol. 3, p. 58; and in 1897 referred by its author to female of Methy postern a 

 barbata Coquillett, Rev. Tach., p. 62. 



115690— 19— Proc.N.M.vol.56— — 37 



