338 THE BLOWFULIES OF NortH AMERICA 
yellowish silvery to golden pollen, and with a few brown hairs 
scattered outside the frontal rows of bristles, and occurring 
as far anteriorly as the foremost frontal bristle; frontal row con- 
sisting of only five or six weak and hairlike bristles, the rows 
only narrowly divergent anteriorly; inner vertical bristles 
straight; postvertical and postocellar bristles weak; vertex with 
brown to black pollen; clypeus yellow golden; parafaciale 3.2 
in width opposite lunule, slightly narrower below, orange, with 
bright golden pollen, and with minute hairs above; faciale 
orange; vibrissae above oral margin by 1.0 and separated by 
4.0; palpus orange, 6.6 in length; antenna orange, third segment 
4.8 times as long as second, orange basally and below, brown 
dorsally; arista and cilia black; back of head black, silvery, with 
three or four rows of postocular cilia and abundant whitish 
yellow hair. 
Thorax blue black with thin silvery pollen and with fhves 
dorsal longitudinal black stripes, one of which is middorsal and 
one lateral to each dorsocentral row; pleura mostly black, with 
long, thin, black hair; propleuron black setose; hindmost pre- 
acrostichal and dorsocentral bristles placed before suture. by 
3.6 and 2.0, respectively; ampullae black, other sclerites at wing- 
base brown; metathoracic spiracle with brown hair. 
Legs black, fore tibia with two posterior bristles, middle tibia 
with one ventral bristle toward middle. 
Wing hyaline, rather brownish; basicosta black; subcostal 
sclerite orange to brown, with orange pubescence; costal sections 
2 to 6 in the proportion 118 :81:190:56:15; apical cell ending 
before wing-tip by 2.2; upper squamal foe white eee brown 
rim; lower squamal lobe white with white rim. 
Abdomen shining usually metallic blue green with purple re- 
flections but often nearly green, with long thickly-set, black 
hair ventrally and apically. 
Genital segments shining black with long black thick-set hair, 
the first segment without a marginal row of bristles. Internal 
morphological features (pl. 30, D, E, and F) as illustrated. 
Female. Head width 16.1; length at antenna 9.1 and at 
vibrissa 9.3; eye height 8.0; head height 12.8; bucea 0.59 eye 
height; front across foremost ocellus 0.31 of head width, 0.37 
at vertex and 0.43 at lunule; ocellar triangle golden pollinose;: 
parafaciale 3.0 in width opposite lunule, nearly bare above, only 
a few brownish hairs on upper half; vibrissae set 4.0 apart; third 
antennal segment 3.9 times..as' long as second; outer vertical 
bristles two-thirds as long as inner Wing with costal sections 
