SUBFAMILY CHRYSOMYINAE 121 
of nearly equal size; frontale in male nearly obliterated below 
ocelli, then widening toward lunule; parafrontale with num- 
erous hairs which extend from vertex to parafaciale outside 
frontal row; frontal rows of bristles but slightly divergent an- 
teriorly in female and only moderately so in male; inner verti- 
- eal bristle present in both sexes; postvertical bristle present; 
frontoorbital bristles absent in male, usually two proclinate and 
one reclinate (rarely one or both entirely absent) in female; 
ocellar bristles of moderate size, proclinate in male, nearly di- 
varicate in female; clypeus deeply sunken and narrow; facial 
carina short, narrow, low, separating antennae by a very nar- 
row margin; parafaciale below one-half as wide as elypeus, 
narrowed above, and with medium-length hairs which are scat- 
tered generally near eye; faciale sharp, steep; vibrissa strong, 
well above oral margin; proboscis three-fourths head height; 
haustellum nearly half head height; palpus short and filiform; 
antennal bases slightly below eye middle when head is viewed 
in profile, narrowly separated by the short and narrow carina; 
third segment of antenna elongate, from three to four times as 
long as second, and reaching about four-fifths the distance to the 
vibrissa; arista thickened slightly at base, plumose on about 
the basal four-fifths, the hairs long above, shorter below. 
Thorax with humeral bristles one strong and two or three 
weaker; propleural bristle strong; preacrostichal bristles absent 
or vestigial; presupraalar bristles one strong, and often with a 
weaker one anteriorly; sternopleural bristles three, the middle 
or lower bristle often very weak but rarely absent; hypopleu- 
ron bare of fine hair except on posterior margin; prosternum of 
moderate size, wide, pilose; postalar declivity thickly pilose in 
center and anteriorly; tympanic pit with a few long hairs; post- 
supraalar bristles three; postacrostichal bristles two, only pre- 
scutellars strong; intrapostsutural and  intrapostsupraalar 
bristles absent; mesopiracular bristle long; mesothoracic spiracle 
small; seutellum with three strong lateral bristles, the under 
surface laterally pilose, without apical bristles; lateral post- 
seutellar plates with fine hairs. 
Legs with fine pile on coxae; fore tibia with one posteroven- 
tral bristle between middle and apical third; middle femur with 
a short row of long posteroventral bristles toward base, one pos- 
terior bristle and one posterodorsal bristle near apex; middle 
tibia with two anteroventral bristles, one near basal third and 
one near apical third, one ventral bristle slightly beyond middle 
and two posteroventral bristles, one near basal third and one 
near apical third; hind femur with anterodorsal row of short, 
