256 THE BLOWFLIES OF NortH AMERICA 
hair; postacrostichal bristles two; thoracic spiracles enlarged, 
brown. 
Legs brown to black; middle femur with one anterior bristle 
near middle; middle an with one posterodorsal bristle; hind 
tibia with ane posterodorsal bristles. 
Wing hyaline, brownish anteriorly and basally; basicosta 
brown; subcostal sclerite orange brown, darker apically and with 
short fine decumbent brownish pile; costal sections 2 to 6 in the 
proportion 82:58:115:42:12; second and third sections of 
fourth vein in proportion of 8:9; third vein setose only at base; 
upper squamal lobe more or less hyaline, brown; lower squamal 
lobe infuseated, nearly black. 
Abdomen colored like thorax and with thin whitish pollen 
ventrally; first segment usually black, often with slight greenish 
luster; second segment without dorsal shining spot anteriorly 
and with a marginal row of rather weak recumbent bristles; third 
segment considerably polished and with a marginal row of strong 
upright bristles; fourth segment highly polished. 
Genital segments black, small, with scattered erect setae. Ana- 
tomical features (pl. 25, C and D) as illustrated. 
Female. Head height 13.5; eye height 9.6; length at antenna 
and at vibrissa 6.8; bueca 0.30 of eye height; head width 15.4; eye 
with normal sized facets; parafaciale opposite lunule 1.8 in 
width; vibrissae set 3.3 apart; front at narrowest (about 1.0 
above lunule) 0.26 of head width, 0.29 at vertex and 0.30 at 
lunule, black, with only a few dark hairs outside frontal row, 
and with heavy whitish pollen, often slightly yellowish toward 
vertex; frontale black, slightly reddish at lunule; frontal rows 
of bristles nearly parallel or converging only slightly anteriorly 
except in the foremost one or two bristles, each row consisting of 
about eight bristles; vertex black, subpollinose, often greenish or 
purplish. Abdomen with first segment rather strongly metallic. 
Otherwise like male except for normal sexual differences. 
Length. 7-9 mm. 
Most specimens are a deep reddish purple in color and easily 
recognized as this species. Some specimens, however, are blue 
green with only purple reflections, and they cannot be dis- 
tinguished from eximia by color differences alone. 
Distribution. Neotropical: Southern Mexico, through Central 
America and South America to Argentina. 
Biology, immature stages, and habits. Although the species is 
well-distributed, it 1s apparently uncommon or extremely local- 
ized where it does occur. Considerable effort was expended in an 
attempt to collect and study this species in the field, but no. 
