6 PROCEEDINGS OF THE NATIONAL, MUSEUM. vol.60. 



ADELPHOMYIA COSTARICENSIS, new species. 



General coloration dark brown; wings brownish subhyaline, the 

 stigma faintly darker; sparse macrotrichiae in cells 2nd R-^^ to 2nd 

 M^\ abdomen dark brown, the hypopygium yellowish testaceous. 



Male. — Length 3.7 mm. ; wing, 3.6 mm. 



Rostrum and palpi dark brown. Antennae dark brown, 16-seg- 

 mented, the verticils comparatively long ; subterminal segments alter- 

 nately long and shorter. Head dark brown. 



Mesonotal praescutum dark brown anteriorly, paler behind with a 

 darker brown median stripe; remainder of the mesonotum brown. 

 Pleura yellowish testaceous, the anterior dorso-pleural region dark 

 brown. Halteres pale, the knobs a little darker. Legs with the 

 coxae yellowish testaceous ; remainder of the legs pale brownish tes- 

 taceous. Wings brownish subhyaline, the stigma faintly darker; 

 veins brown. Sparse macrotrichiae in the ends of cells %nd R^, R^i 

 i?3, ^5, and 2nd M^. Venation : Sc^ a little longer than the basal de- 

 flection of Gu.^ ; 7' faint but evident, about its own length beyond the 

 fork of jBjhsJ inner end of cell R^ arcuated; r — m longer than the 

 basal deflection of Cu-^\ inner end of cell 1st M^ strongly narrowed, 

 the basal deflection of i/i+j shorter than m; petiole of cell M^ a 

 little longer than the cell ; m about twice the deflection of M^ ; basal 

 deflection of Cu^ near midlength of cell 1st M^. 



Abdomen dark brown, the hypopygium yellowish testaceous. 



Habitat. — Costa Eica. 



Holotype. — Male, Turrialba, August, 1920 (A. Alfaro). 



Type.— Cat. No. 24698, U.S.N.M. 



The discovery of a species of this genus in the Neotropical Region 

 is of more than passing interest. Its nearest relative is A. a7nericana 

 Alexander of Northeastern North America from which it differs in 

 the dark coloration and sparse macrotrichiae of the apical cells of 

 the wings. 



MICROTIPULA (MICROTIPULA) COSTARICENSIS. new species. 



General coloration brown, the mesonotal praescutum with three 

 darker brown stripes near the suture; nasus lacking; front yellow; 

 dorsum of head brown ; basal segments of antennal flagellum bicolor- 

 ous; wings tinged with brown, the costal region strongly yellowish 

 with alternate dark brown areas that include both the costal and 

 subcostal cells, merging with the ground color in the radial cells; 

 no macrotrichiae in cells of wings. 



Female. — Length about 7.5 mm. ; wing 8.8 mm. 



Frontal prolongation of head short, clear yellow above, dark 

 brown laterally and beneath ; palpi dark brown ; nasus entirely lack- 

 ing. Antennae 12-segmented ; scape yellow; basal four flagellar 

 segments bicolorous, the basal two-thirds of each segment dark 



