208 
29. 
30. 
31. 
32. 
33. 
34. 
THE BLOWFLIES OF NoRTH AMERICA 
Squamal lobes white; ss 2944) .aeGe. ce 30 
Squamal lobes brown 2.0% “i A 31 
Second abdominal tergite with a marginal row of strong 
bristles; third tergite with strong discal bristles. 
(Nearctic)...... Acronesia collin, new species, p. 279 
Second abdominal tergite with a marginal row of strong 
bristles; third tergite without strong discal bristles. 
(Nearctic) ....Acronesia popoffana (Townsend), p. 280 
Middle tibia with three anterodorsal bristles; hind tibia 
with two anteroventral bristles; back of head with mostly 
black hair. (Nearetie) 737, -63..9 5 «<0c ke 
cL ire Rp 8 se ta Acronesia aldrichia (Shannon), p. 277 
Middle tibia with one or two anterodorsal bristles, usually 
with but one; hind tibia with one anteroventral bristle; 
back of head with mostly light hair except for one or 
two rows of postocular cilia (Nearctic).............. 
Ri Ate MOSCA AT Acronesia alaskensis (Shannon), p. 275 
Two preacrostichal bristles; male with two posterior 
bristles on fore tibia (Nearctic).................05. 
Ue 2 EE A Onesia bisetosa, new species, p. 322 
One preacrostichal bristle; male with but one posterior 
bristle on fore tibia. (Nearctic)............ ar at seargr ae 
PSR Paria eh, | eae Onesia townsendi, new species, p. 324 
Faciofrontalial profile strongly protuberant, the parafacio- 
eye angle strong; male with reclinate frontoorbital 
bristle opposite ocellar bristles; one or three postacros- 
tical bristles, os. oes ahs cca se oltey os nes 8 
Faciofrontalial profile not protuberant, the parafacio-eye 
angle not strong; male without reclinate frontoorbital 
bristles; two postacrostical bristles (Nearctic)....... 
Cynomyopsis cadaverina (Robineau-Desvoidy), p. 326 
Hindmost preintraalar bristle absent; one postacrostichal 
bristle; male with second genital segment much longer 
than the first and with a ventral bristle on the middle — 
CUDA oa ee ee are Ce Fn pe oe eee 35 
Hindmost preintraalar bristle present; three postacros- 
tichal bristles; male with second genital segment hardly 
longer than the first and without ventral bristles on 
the middle tibia. (Nearctic)...................008 
t JOT ER Cyanus elongata (Hough), p. 332 
