SUBFAMILY CHRYSOMYINAE 129 
pecially at the humeri; black middorsal longitudinal stripe ex- 
tending anteriorly only slightly beyond suture; coloring tend- 
ing toward bluish or purplish black instead of bluish green; 
predorsocentral bristles weak but usually present (three may be 
counted in some specimens); preintraalar bristles two, the an- 
terior bristle stronger, the posterior bristle often weak and 
hairlike or occasionally absent; presupraalar bristle one, strong; 
pleura with mostly black hairs except for a small area of tawny 
hairs on posterior margin of sternopleuron and another im- 
mediately surrounding the mesopleural row of bristles; pros- 
ternum with scattered black hair; postalar declivity with a de- 
finite tuft of black and tawny hairs near middle; seutellum with 
one large and usually one smaller diseal bristle, but sometimes 
with three or four smaller discals beside these, the under sur- 
face with black hair laterally; lateral postseutellar plates with 
black setae. 
Legs black, sometimes brownish black, and often with bluish 
green luster; anterior coxa with a few whitish hairs toward 
base; anterior femur with dorsal and posteroventral rows of 
bristles and with long seattered hairs posteriorly; anterior tibia 
with five to seven dorsal bristles; middle tibia with one an- 
terodorsal bristle near apical third; hind femur with anterodor- — 
sal and anteroventral rows of bristles with an incomplete row 
basally on ventral surface; hind tibia with anterodorsal row of 
short closely-set black setae. 
Wing considerably infuseated toward base and with wing 
veins dark brown to black; costal sections 2 to 6 in the propor- 
tions 91:68 :109 :31:8.6; subeostal sclerite orange brown, darker 
at base, and with some rather short but distinct setae basally 
on anterior margin; basicostal seale dark brown to black; upper 
squamal lobe hyaline, brownish on outer portion; lower squamal 
lobe usually white, but. orange brown in a few specimens. 
Abdomen deep bluish black with purple luster, with pollen 
which appears silvery whitish in certain lights, the first seg- 
ment mostly shining; a shining middorsal longitudinal stripe 
extending from a wide base on the anterior margin of the see- 
ond segment, rapidly narrowing posteriorly to a narrow line on 
the fourth segment; ventral margins of tergites with heavy 
whitish pollen; fourth segment with rather erect scattered dis- 
eal hairs. 
Genital segments strongly metallic greenish over a black 
ground color, mostly shining; first segment with a rather well- 
defined row of marginal bristles. Internal features (pl. 17, G, 
H, and I) as illustrated. 
