78 Tur BLOWF.LIES or NortH AMERICA 
showing through; parafaciale at narrowest not so wide as the 
third antennal segment. 
Female. Head width 15.3; height 12.0; eye height 10.0; length © 
at antenna 6.9, and at vibrissa 7.2; bueca 0.12 of eye height, 
orange, with thin whitish pollen and with black hair, a few pale 
hairs below and posteriorly; front orange red anteriorly, brown- 
ish black posteriorly, silvery yellow pollinose, 0.27 of head width 
at vertex, the margins gradually diverging anteriorly, then 
flaring to one-third of head width at lunule; six large frontal 
bristles anteriorly, four weaker frontal bristles posteriorly, with 
a few weak hairs outside the frontal rows; frontale orange 
anteriorly, graduating toward dark brown on the posterior two- 
thirds, occupying considerably more than one-half the frontal 
width; vertex dark brown, silvery to brown pollinose; parafaciale 
orange, covered with silvery yellow pollen, 1.7 in width opposite 
lunule and narrowing very slightly below; faciale rather. 
rounded, but high from clypeal plane, and with some black setae 
above vibrissae which ascend about one-fourth the distance to 
the antennal base; vibrissae slightly above the oral margin and 
set 3.8 apart; antenna orange, third segment dark brown on the 
dorsal half or more and 2.6 times as long as second; arista brown, 
with long brown ciliation; palpus yellow, 4.1 in length; back of 
head black, postvertex dark brown and mostly shining, but with 
some gray pollen, with one row of postocular cilia and with 
scattered tawny hair; metacephalon orange. 
Thorax dark brown with silvery or silvery yellowish pollen, 
leaving a shining middorsal longitudinal stripe extending to 
scutellar suture, and with another stripe outside the dorsocentral 
row of bristles which does not extend quite so far; fine thoracic 
hair mostly dark; pleura orange to brownish with thin pollen; 
humerus orange to orange brown, with pale hair laterally and 
ventrally and with three bristles; propleural bristle one, among 
long fine pale hair; mesospiracular bristles two or three, usually 
only one strong, these also surrounded with long fine pale hair; 
sternopleuron with considerable pale hair ventrally and on the 
posterior margin; sternopleural bristles two; pteropleuron with 
posterior half covered with pale hair; preacrostichal bristle one, 
placed 2.8 before the suture; hindmost predorsocentral bristle 
placed 1.6 before the suture; preintraalar bristles one; postacro- 
stichal bristle one; selerites at wing base yellowish brown; lesser 
ampulla black; postalar declivity in center and tympanic ridge 
with a few pale hairs; thoracic spiracles with pale yellow hair, 
the metathoracie spiracle with long tawny hair on ventral 
margin; scutellum concolorous with dorsum, the under surface 
