82 THE BLOowF.LiEs oF NortH AMERICA 
darker apically; tibiae and tarsi dark brown; coxae with some 
fine orange hair; bristling as in bicolor. 
Wing (pl. 8, G) brownish, orange basally, basicosta and sub- 
costal selerite orange brown, the latter with orange pubescence; 
costal sections 2 to 6 in the proportions 90:70 :100:80:10; squamal 
lobes orange brown, rims brown with tawny ciliation. 
Abdomen with first segment orange at base, the posterior 
third dark metallic purple on dorsum, with one lateral bristle; 
second segment with only ventral margins of tergite orange, the 
posterior third shining purple, with one lateral bristle; third 
segment with posterior two-fifths shining purple and with two 
rows of strong erect marginal bristles; fourth segment brownish 
pollinose over purple ground color, with a row of strong discal 
bristles and a row of weaker marginal bristles. | 
Genital segments large, globose, dark brown, with black hair. 
Internal morphological features (pl. 13, A and B) as illustrated. 
Female. Unknown. 
Length. 8.7 mm. 
The holotype, which was collected March 18, 1911, by Busck, 
is the only specimen known to me. 
Huascaromusca umbrosa (Aldrich), new combination 
Mesembrinella bicolor Van der Wulp (nee Giglio-Tos), Biologia 
Centrali-Americana, Insecta, Diptera, vol. 2, p. 301, 1896. 
(Two females, Mexico, in the British Museum. ) 
Mesembrinella umbrosa Aldrich, U. 8. Natl. Mus. Proe. 62(11) : 
12, 1922. (Type, male from Costa Rica, No. 25246, in the 
U.S. National Museum.) 
A rather, uniformly dark brown species with the abdomen 
metallic blue over a brown ground color except at the base. 
This is the largest of the calliphorid species known to me. It 
is one of the most strikingly colored species of Mesembrinellinae. 
Male. Head width 21.0; length at antenna and at vibrissa 9.8; 
eye height 17.8; bueca 0.11 of eye height, deep orange with yellow 
pollen, and with only black hairs; frontale deep orange, not as 
wide as parafaciale at the lunule, and obliterated at the narrow- 
est portion of front; frontal row of bristles extending anteriorly 
only to the antennal base and not further than the narrowest 
portion of front, consisting of eight or nine bristles, the anterior 
ones strong; vertex dark brown and dark brown pollinose; front 
at narrowest 0.01 of head width, 0.11 at vertex, and 0.24 at 
lunule, orange, golden pollinose, and practically bare of fine 
hairs; inner vertical and ocellar bristles weak but elongate; 
