SUBFAMILY CALLIPHORINAE 323 
pean biseta in that the male has a bristle between the foremost 
postdorsocentral and postintraalar bristles. The females lack 
this bristle, as do all of the specimens of Palearctic species which 
I have seen. 
A small blue black species with the aspect of Calliphora. 
Male. Head (pl. 6, C) width 11.7; length at antenna 7.1 and 
at vibrissa 6.8 eye height 7.5; head height 10.5; bueea 0.39 eye 
height, black, with dull gray pollen and black hairs; frontale as 
wide as one parafrontale, dull black; front black, silvery gray 
pollinose, at narrowest (just anterior to foremost ocellus), 0.08 
head width, 0.18 at vertex and 0.32 at lunule, with considerable 
fine black hair just outside frontal rows of bristles which extend 
forward only to lunule and are moderately divergent as they 
follow the margins of the frontale, each row consisting of about 
ten bristles, of which only the foremost are strong; vertex black, 
with rather silvery pollen; parafaciale 1.8 in width opposite 
lunule and below, black, with gray pollen, bare along eye mar- 
gin; faciale reddish, with two or three rows of short black setae 
which ascend about one-third the distance to the antennal base; 
vibrissae separated by 2.2; palpus orange, 3.2 in length; antenna 
black, apex of second segment often reddish, third segment only 
2.0 times as long as second; arista black, thickened only at base, 
and with fine short black cilia above, shorter below; ocellar 
bristles set rather far back on ocellar triangle which has a 
number of erect black hairs posteriorly; back of head black, 
covered with silvery pollen, and with three or four rows of 
postocular cilia, pale hairs only around occiput and a few below 
on metacephalon. 
Thorax black, with gray pollen which is most apparent an- 
teriorly, and with several indistinct dorsal longitudinal stripes; 
preintraalar bristles three, hindmost present; hindmost pre- 
acrostichal and dorsocentral bristles set 2.4 and 1.2, respectively, 
before suture; sternopleural bristles usually three, arranged 
2 — 1 (sometimes four and in one instance observed, five) ; 
preparapteron yellow brown, other sclerites at wing-base black; 
postalar callus without the usual weak third postalar bristle 
which is normally placed medianly and posterior to large hind- 
most bristle; postintraalar bristles two; intrapostsupraalar bris- 
tles present; spiracles small, with dark brown hair; under sur- 
face of scutellum laterally with dark brown hair. 
Legs black, thinly covered with whitish pollen; fore tibia with 
two posterior bristles, one near middle and one near apical 
fourth; middle tibia with two posterior bristles and usually with 
two posterodorsal bristles. 
