SUBFAMILY CALLIPHORINAE 203 
ale longitudinally striate; arista with long cilia above and be- 
low, the tip often bare. 
Thorax without long crinkly hair; propleuron setose; noto- 
pleural bristles two; mesopleuron bare on anterior fourth; sterno- 
pleuron bare on anterior fifth; prosternum setose; pteropleuron 
bare on anterior half or slightly less; intrapostsutural and in- 
trapostsupraalar bristles absent; scutellum without apical 
bristles. 
Legs of moderate length; hind coxa bare posteriorly. 
Wing with remigium bare above and below; only third vein 
setulose and this only at base; fourth vein ending in costal mar- 
gin eonsiderably below wing apex; apical cell clearly open; 
upper squamal lobe rounded, small, bare; lower squamal lobe 
large, posterior margin often wide. 
Abdomen oviconical to ovate, often considerably more conical 
in male than in female. 
Larva. Second instar with labial sclerite enlarged toward 
tip. Third instar with posterior spiracle with complete peri- 
treme or ring in which there is a distinct ‘‘button.’’ 
KEY TO SPECIES OF NORTH AMERICAN 
CALLIPHORINAE 
1. Lower squamal lobe bare above; parafaciale usually entire- 
ly bare; parasquamal tuft present; arista usually with 
ejlia almost to apex. Larva without accessory oral 
selerite between labial sclerites...... (Luceiliini, p. 211) 2 
Lower squamal lobe pilose above; parafaciale usually 
partially setose; parasquamal tuft absent; arista with 
or without cilia apically. Larva with accessory oral 
sclerite between labial sclerites. . (Calliphorini, p. 271) 15 
2. Vibrissa above oral margin; arista with penultimate seg- 
ment short, the cilia long above and below; preintraalar 
bristles three; back of head in male flattened or con- 
BAY CRIMEEOTOLL Ghoti Wet usin et et AN ene REE AER 3 
Vibrissa at oral margin; arista with penultimate segment 
from one and a half to two times as long as its diameter 
and with rather short cilia above and below; prein- 
traalar bristles two; back of head in male rounded in 
profile (Alaska) Francilia alaskensis Shannon, p. 213 
~ 38. Subcostal sclerite with only short soft pubescence ; ocellar 
triangle not reaching halfway to lunule in female.... 4 
Subeostal sclerite with wiry bristles; ocellar triangle large, 
' reaching halfway to lunule in fell: (Holaretic). . 
Re ee ee Lucila illustris (Meigen), p. 294 
