242 THE BLOWFLIES OF NortH AMERICA 
- veins dark brown; basicosta brown to brownish black; subcostal 
sclerite yellow brown basally, darker apically, with fine short 
brown pile; costal sections 2 to 6 in the proportion 64:47 :89 :37 :11; 
upper squamal lobe white at base and brown on margin; lower 
squamal lobe brown. 
Abdomen shining metallic blue green or sometimes rather 
bluish with green reflections, the hind margin of the segments 
often purplish or black, and with only a trace of thin silvery 
pollen ventrally; first segment black; second with a slightly 
darkened area on anterior middorsal margin, and with a marginal 
row of rather weak recumbent bristles; third segment highly 
polished, particularly on posterior dorsal half, and with a mar- 
ginal row of erect bristles; fourth segment entirely shining and 
highly polished; all segments ventrally with rather long black 
hair. 
Genital segments black, very slightly greenish, small, with 
seattered black setae. Internal anatomical features (pl. 24, F, G, 
and H) as illustrated. 
Female. Head height 10.9; eye height 8.6; bueca 0.22 of eye 
height; length at antenna 5.4 and at vibrissa 5.8; parafaciale 
opposite lunule 1.2 in width; vibrissae set 2.6 apart; head width 
13.2; frontale black posteriorly, reddish brown at lunule, and 
narrowing toward lunule where it is a little wider than either 
parafrontal; front at narrowest (about 1.0 unit above lunule) 
0.24 of head width, 0.29 at vertex and 0.29 at lunule; frontal 
row of bristles consisting of about six bristles nearly equal in 
size; outer vertical bristles divaricate and about three-fifths as 
long as inner vertical bristles; frontoorbital bristles two, pro- 
clinate (the anterior one the larger) and one reclinate; ocellar 
bristles almost exactly divaricate, and with a posterior pair of 
lesser divaricate ocellar bristles behind and between the pos- | 
terior ocelli; vertex black, somewhat shining, and usually green- 
ish in certain lights; epistoma rarely with weak setae between 
vibrissae; palpus 3.6 in length; third segment of antenna 3.8 
times as long as second and usually more orange than in male. 
Thorax with slightly more whitish pollen than in male. Wing 
more yellowish or yellowish brown at base, squamal lobes white, 
orange on rims. Abdomen highly polished on last two segments, 
particularly on dorsum. Otherwise like male except for normal 
sexual difference. 
Length. 6-8 mm. 
Reared and teneral specimens of eximia are often bronzy green 
instead of the typical steel blue green. Specimens are frequently 
seen which are almost entirely blue with only suggestions of 
