1944] New Neotropical Phoridoe 157 
posterior margin, noticeably longer on the more apical tergites. 
Hypopygium small, its surface pruinose; rounded, with scat- 
tered, stiff, bristly hairs below and apically above; apical lamella 
pale yellow, with very weak scattered hairs. Legs slender, ex- 
cept the front tarsi which are comparatively stout although not 
really thickened. Hair seam on middle tibiae distinct only on 
basal half; the row of setulae extremely delicate. Hair seam of 
hind tibiae complete, straight, the setulae distinct, but very weak 
and closely placed. Costal vein slightly less than one-half the 
wing length (46:100); costal cilia moderately long, about 
equalling the length of the third section of the costa. First sec- 
tion of costa slightly more than twice as long as the second; 
third half as long as the second (35 : 17:9) ; fourth vein weakly 
curved, fourth and fifth each feebly bisinuate; seventh distinct, 
slightly curved. 
Type and one paratype from Matucana, Peru, May 27, 1920. 
Matucana is in the valley of the Rio Rimac, about 4000 feet 
above sea level. Type in the collection of Cornell University. 
This species is from the same locality as M. andicola , but is 
not very closely related. The tibial setulae are minute and the 
wing venation is very different. In Borgmeier’s key (Arch. Mus. 
Nac. Rio de Janeiro, vol. 25, p. 139, 1925) it runs to M. ste- 
phanoidea Borgm. from which it differs by color and the much 
longer third costal section, while the entire costa is less than 
half the length of the wing. Among Enderlein’s species as 
tabulated by Borgmeier, it resembles M. obscurata and related 
species, from which it differs at once by the more nearly equal 
first and second sections of the costa. 
Megaselia (s. str.) cavita sp. nov. 
9. Length 2.2 mm. Head and thorax yellow, the ocellar 
triangle black and the front strongly infuscated, except the sides 
and the front margin. Abdomen black, suffused with fulvous 
over the medial portions of the second, third and fourth tergites; 
sixth tergite with a similar large pale area at each side. Legs 
and hypopygial projection testaceous. Wings faintly brownish, 
with strong dark venation. Halteres piceous. Front slightly, 
but distinctly wider than long, its bristles stout, but not espe- 
cially long, surface rather shining; ocellar tubercle and median 
groove well developed. Two large postantennal bristles placed 
very close together; lower pair absent. Antial bristles on the 
