SUBFAMILY CHRYSOMYINAE 105 
below to apex; back of head concave above, slightly rounded 
below with head in profile, and with one row of postocular cilia. 
Thorax with humeral bristles three or four, weak to moderate- 
ly strong; preintraalar bristles two, the posterior one of which 
is placed about 1.0 before the suture; posthumeral bristle pres- 
ent; preacrostichal bristles absent or vestigial; predorsocentral 
bristles four, two weak and two strong, the posterior bristle 
placed 1.0 before the suture; presupraalar bristle one; meso- 
pleural bristles about six, strong; sternopleural bristles two; 
prosternum large, wider anteriorly than posteriorly, pilose; 
postalar declivity setose in center; hypopleural bristles about 
seven; postdorsocentral bristles four, only prescutellars strong; 
postalar bristles two; postacrostichal bristles two, only the pre- 
scutellar strong; intrapostsutural bristles present; postintraalar 
bristles two, intrapostsupraalar bristles absent; intrapostalar 
bristle differentiated; mesospiracular bristles long; mesothoracic 
and methathoracic spiracles large, the latter ovate; scutellum 
with one discal bristle (sometimes one weaker discal bristle 
laterally), and three lateral bristles, the intermediate one of 
which is weak. | 
Legs with hair and short pile on coxae; anterior tibia with 
about three anterodorsal bristles, these evenly spaced from basal 
fifth to middle, and with one posteroventral bristle near apical 
fourth; middle femur with one anterior bristle near middle, one 
anteroventral bristle near basal sixth, three posteroventral 
bristles, these evenly spaced from base to basal third, and with 
several apical bristles ranging from posterior to posterodorsal 
surface; middle tibia with one anterodorsal bristle near apical 
third, two posterior bristles, one near basal fourth and one near 
apical third, and one posterodorsal bristle near apical fourth; 
hind femur with unevenly-spaced anteroventral row of bristles, 
about three near basal third, one near middle, and two or three 
near apical third, and one posteroventral bristle near basal 
fourth; hind tibia with three anterodorsal bristles, one near basal 
third, one near middle, and one near apical fourth, two antero- 
ventral bristles, one near middle and one near apical third; 
elaws and pulvilli small. 
Wing with subcostal sclerite strongly setose anteriorly and 
apically; fourth vein without apical section or fold, the angle 
rounded and rather obtuse; apical cell clearly open and ending 
0.8 before the wing tip; anterior cross vein 1.0 beyond the middle 
of the second section of the third vein and strongly oblique; 
posterior cross vein doubly arcuate; last section of fifth vein 
one-fifth as long as proceeding section; upper squamal lobe small, 
