SUBFAMILY CHRYSOMYINAE  *40 
pollen, and with considerable short black hair; back of head 
blackish with thin yellowish silvery pollen and with considerable 
whitish hair; parafaciale greatly narrowed above, blackened on 
upper half, with silvery to yellowish-silvery pollen, and bare on 
lower half; clypeus about one and one half times as long as 
broad; epistoma not so strongly narrowed from elypeus but 
strongly warped forward, then briefly downward toward oral 
margin; antenna orange brown, third segment dull brownish, 
four times as long as second; palpus 2.0 in length. 
Thorax blackish with metallic blue-green luster, with con- 
siderable dull fuseous and silvery pollen, and with three wide, 
dorsal, longitudinal stripes which do not extend beyond the 
scutellar suture;. predorsocentral bristles two, the anterior 
bristle weak; preintraalar bristles with the middle one of the 
series absent and the anterior bristle weak; presupraalar bristle 
one, stronger than other presutural bristles; posthumeral bristle 
weak; intrapostalar bristle a little longer and stronger than sur- 
rounding hairs; mesopleuron with seattered short black hairs 
except on anterior fourth; squamopleuron with short fine de- 
cumbent brownish pile; lateral postscutellar plates with dark 
hair. 
Legs dark brown; midtibia with one anterodorsal bristle near 
apical third; coxae and basal sections of femora with soft whitish 
hairs. 
Wing hyaline, not strongly brownish basally; costal sections 
2 to 6 in the proportions 60:40:80:28:6; basicosta and subcostal 
sclerite orange, the latter setose; anterior cross vein slightly be- 
yond middle of second section of fourth vein; bend in fourth 
vein rounded and without apical spur or fold; upper squamal 
lobe hyaline, brownish on apical fifth; lower squamal lobe hyaline 
at base but strongly infuscated on apical three-fifths or more. 
Abdomen colored as thorax, mostly shining but with thin 
whitish pollen especially laterally and along edges of tergites in 
eertain lights; fourth segment bright aeneous with metallic 
bronze, gold, and yellow green. 
Second genital segment orange yellow. Internal anatomical 
features (pl. 18, C, D, and E) as illustrated. 
Female. Head height 7.4; length of head at antenna 4.0 and 
at vibrissa 4.4; eye height 5.6; bueca 0.29 of eye height; para- 
faciale opposite lunule 1.2 in width; distance between vibrissae 
1.4; head width 9.4; front at narrowest (at vertex) 0.31 of head 
width, 0.36 at antennal base; palpus 2.5 in length. Otherwise 
similar to male except for normal sexual differences, 
Length. 5.5-8.5 mm. 
