2 PEOCEEDIXGS OF THE NATIOaSTAL, MUSEUM. vol. 60. 



brown, the terminal tarsal segments darker brown. Wings sub- 

 hyaline, conspicuously reticulated with brownish gray and brown: 

 cell Sc more yellowish ; conspicuous brown blotches at the base of 

 the wing; origin of Rs; largest at the tip of R^ (stigma), extending 

 caudad to the fork of Rs; tip of R^+z'-, paler blotches in cell M be- 

 fore midlength and in cell Cu^ ; about a dozen narrow dark-brown 

 reticulate markings in the costal cell, this coloration also including 

 the costal vein; the blotch at the stigma sends four black rays to 

 costa ; the blotch at the top of ^2 + 3 sends three rays to costa ; con- 

 spicuous reticulations in all the cells, darker in the anterior region 

 of the wing, paler in the posterior and anal cells; anal angle nar- 

 rowly margined with brow^n; reticulations in the 2nd Anal cell pale; 

 costal, subcostal, and radial veins yellow, except in the darkened 

 areas; remaining veins yellowish brown. Venation: Sc long, Sc^ 

 ending about opposite midlength of Rs, Sc^ turned strongly into 

 costa at the tip, SC2 a short distance from the tip of /Sc^, Sc^ alone 

 being about equal to r-jp^; Rs strongly angulated at origin ; deflection 

 of B^+^ about two-fifths of Rs; cell 1st M^ large, pentagonal, longer 

 than any of the veins beyond it; 771 about one-third the outer deflec- 

 tion of Mr. ; basal deflection of Cu^ before the fork of il/, the distance 

 about equal to m; Cu^ shorter than the deflection of Cu.^. 



Abdomen brownish testaceous. 



Habitat. — Costa Rica. 



Holotype.—FQm?L\Q, Tiribi, October 9, 1920 (A. Alfaro). 



Type.—C2it. No. 24693, U.S.N.M. 



DICRANOMYIA ALFAROI, new species. 



General coloration light yellow; wings with cell 1st M^ open by 

 the atrophy of the outer deflection of M^; vein Sc long. 



Male. — Length 3.2 mm.; wing 4.2 mm. 



Rostrum and palpi testaceous yellow. Antennal scape yellow; 

 flagellum broken. Head light yellow; eyes conspicuously black. 



Thorax light j^ellow without markings. Halteres light yellow. 

 Legs pale testaceous yellow ; claws with a very long tooth at about 

 one-third their length. Wings w^ith a pale yellowish tinge ; stigma 

 barely indicated; veins pale. Venation: Sc long, Sc-_ extending to 

 beyond midlength of Rs, Sc^ near the tip of Sc^', Rs long, gently 

 arcuated; r at the tip of R^; deflection of ^4 + 5 about three-fifths Rs; 

 cell 1st Mo open by the atrophy of the outer deflection of M^ ; petiole 

 of cell 2nd M^ shorter than the cell ; basal deflection of Cii^ beyond 

 the fork of M, longer than Cu^; 1st Anal vein very weak; conspicu- 

 ous macrotrichiae on the veins bevond the level of the origin of Rs.. 



Abdomen pale yellow. 



Habitat. — Costa Rica. 



HoIotT/pc—M^le, San Jose, October 7, 1920 (A. Alfaro). 



Tijpe.— Cat. No. 24694, U.S.N.M. 



