258 Tut BLowrules or NortH AMERICA 
orange brown in ground color, with dark brown hair anteriorly 
but with tawny to orange hair posteriorly, and with thin yellow- 
ish white pollen; frontale dark brown, hardly apparent at nar- 
rowest portion of front but as wide as parafrontale at lunule; 
front at narrowest 0.03 of head width, 0.18 at vertex and 0.21 
at lunule, black in ground color, with silvery pollen tinged with 
yellowish, and with a few fine whitish hairs outside frontal row; 
frontal rows of bristles obsolete at. narrowest part of front, not 
continuing toward vertex, extending anteriorly only to lunule, 
and moderately diverging as they follow the margin of the fron- 
tale, each row consisting of about seven bristles; postvertical and 
postocellar bristles yellow, weak and proclinate; clypeus brown, 
with thin silvery pollen; faciale orange to red orange or brown, 
straight in profile except as it curves forward at vibrissa, and 
with a row of short black setae which ascend about one-third 
the distance to the antennal base; vertex black, with faint brown 
pollinosity; only minute carina present; parafaciale opposite 
lunule 0.6 in width, almost as wide below, reddish brown in 
ground color, and with silvery pollen which appears yellowish 
in certain lights because of the ground color; vibrissae very 
slightly above the oral margin and set 2.4 apart; palpus orange, 
3.4 in length, and slightly protruding beyond oral margin in pro- 
file; antenna with first segment brown, second and third segments 
orange basally, darker apically, the latter 4.6 times as long as 
second and reaching six-sevenths the distance to the vibrissae; 
arista slightly thickened at base, orange to brown, with long 
brown cilia above and below for four-fifths its length; back of 
head black, with silvery pollen around occiput, with one row of 
postocular cilia and with numerous pale hairs, especially below. 
Thorax dark blue green with purple reflections, and with sil- 
very pollen on dorsum especially between humeri and on pleura, © 
and with faint indications of darker longitudinal stripe outside 
acrostichal row which extends only slightly beyond suture; 
humerus with mostly yellow setae; postintraalar bristles two; 
postacrostichal bristles two; postsupraalar bristles three; hind- 
most preacrostichal and predorsocentral bristles placed 1.8 and 
0.8, respectively, before the suture; pleura with considerable 
pale hair; under surface of scutellum with pale hair laterally; 
lateral postscutellar plates with black setae; postalar declivity 
with pale and brown hair anteriorly and at middle; sclerites at 
wing-bases brown to black. 
Legs black, often slightly brownish; coxae with considerable 
pale hair; middle tibia without posterior bristles; otherwise like 
sericata. : 
