SUBFAMILY MESEMBRINELLINAE 79 
with pale hair, lateral bristle one; postscutellar plates with long 
fine pale hair. 
Legs yellow to orange at coxae, the color graduating through 
orange to dark brown toward tarsi; coxae with fine yellow hair; 
chaetotaxy as in bicolor. 
Wing (pl. 8, E) brownish along all veins and yellowish anter- 
iorly and basally; basicosta yellow orange; subcostal sclerite 
orange brown with long brown setae; costal segments 2 to 6 in 
the proportions 100:110:143:68:10; squamal lobes hyaline and 
brownish, the upper lobe with brown rim, the lower lobe brown 
on the inner third. 
Abdomen with first segment orange at base, metallic blue over 
brown ground color on the posterior margin; second, third, and 
fourth segments brown, metallic bluish, with thin, shifting, 
silvery pollen; no lateral bristles on first or second segments, 
third with strong erect marginal row, fourth with a marginal 
row of weaker bristles. 
Length. 8.2-9.4 mm. 
Three paratype females of this species are in the National 
Museum (No. 48882) and three are in J. Bequaert’s collection. 
Huascaromusca spicata (Aldrich), new combination 
Mesembrinella spicata Aldrich, U.S. Natl. Mus. Proc. 66(18) :13, 
1925. (Type, male from La Suiza de Turrialba, Costa Rica, 
No. 26796, U. S. National Museum.) 
A blue- or purplish-black species with brown legs, hyaline 
wings; the face, clypeus, palpi, and antennae orange. 
The genital structures of the male of this species are unique in 
the subfamily. The external structure of the abdomen (pl. 12, 
C and E) and postabdominal segments are reminiscent of certain 
sarcophagid species, particularly pone ae argentea Tns. and 
S. importuna Wk: 
Male. Head width 12.8; length at antenna 6.4 and at vibrissa 
6.0; eye height 10.0; head height 12.0; epistoma orange; bucca 
orange with golden pollen, 0.16 of eye height, with black and 
golden hair, frontale as wide as parafrontale, orange anteriorly, 
orange brown posteriorly; frontal row of bristles consisting of 
about 11 bristles, large and strong anteriorly only, weak and 
hair-like toward the narrowest part of the front; front at nar- 
rowest, 0.10 of head width, 0.15 at vertex, and 0.23 at lunule, 
orange anteriorly, brownish posteriorly, with golden pollen and 
with a few dark hairs outside the frontal rows; vertex dark 
brown with brown pollen; ocellar triangle with a pair of acces- 
