90 THE BLowF.uies of NortH AMERICA 
the epistoma as long as clypeus, greatly produced, erectly por- 
rect, and strongly warped forward from the elypeal plane; meta- 
cephalon flat; bueca high; eye long-ovate, the longitudinal axis 
nearly parallel with posterior margin of head; frontale in male 
obsolete at narrowest portion, in female slightly narrower than 
parafrontale, striate; eyes in male nearly contiguous, in female 
separated by nearly one-third head width, with a few scattered 
hairs on the parafrontale outside the frontal row of bristles; 
frontal rows of bristles extending anteriorly to the middle of 
the third antennal segment and widely divergent; inner vertical 
bristles straight; outer vertical bristles absent in male but pres- 
ent in female; postvertical bristles absent; frontoorbital bristles 
absent in both sexes, the female with a row of short setae.in place 
of these; ocellar bristles minute; postocellar bristles proclinate; 
clypeus wide, nearly flush with facial profile; facial carina short, 
wide, high, and with a median furrow separating antennal bases; 
parafaciale of uniform width, setose on the upper two-thirds; 
faciale rounded, strongly bowed, with only a few bristles above 
vibrissae, haustellum half head height; palpus two-thirds length 
of head at vibrissa, thin, strongly flattened and clavate; anten- 
nal base below eye-middle when head is viewed in profile; third 
segment of antenna about twice as long as second and reaching 
nearly four-fifths the distance to the vibrissa; arista with short 
penultimate segment, long pectinate above for slightly more 
than half the distance to the apex; back of head flat or dished in 
profile, without intrapostocular cilia; occipital orbits very nar- 
row. 
Thorax with two humeral bristles; propleuron bare; prein- 
traalar, predorsocentral and preacrostichal bristles not differ- 
entiated; posthumeral bristle absent; presupraalar bristle one; 
sternopleural bristles two; prosternum flat, of medium size, nar- 
row, pilose; postalar declivity bare; tympanic pit bare; postalar 
bristles two; postacrostichal and postdorsocentral bristles in 
prescutellars only; postintraalar bristle one; postsupraalar 
bristles two; scutellum without discal bristles, lateral bristles 
two, no apical bristles. 
Legs with anterior coxa finely pilose, posterior coxa bare 
posteriorly; fore femur with posterodorsal and posteroventral 
rows of bristles, the posterior surface with considerable hair but 
no rows of bristles; fore tibia with a few short anterodorsal 
bristles toward middle, one of which near the apical third is 
stronger than others, and with one strong posterior bristle near 
apical third; middle femur with one strong anterior bristle near 
middle, and with anteroventral and posteroventral rows of bris- 
