206 
15. 
16. 
it 
Rss 
19. 
20. 
C 
21. 
22. 
Tse Buowr.ies or Nortuo AMERICA 
Bueea with dark hair dorsally and anteriorly, pale yel- 
lowish brown hair anteriorly and posteriorly; middle 
tibia usually without posterior bristles and two or three 
posterodorsal bristles. (Neotropical)................ 
TAG GAPS LAR £8 Phaenicra reca (Shannon), p. 257 
Faciale with strong ascending bristles; accessory ocellar 
bristles’ present. «7.5. 0... 00. we ee ae 2 oe 16 
Faciale without strong ascending bristles; accessory ocel- 
lar bristles absent oc. 2... ..0< 4 +ss«5 62 awradh +0ge een 17 
Front at narrowest 0.21 of head width in male, 0.38 in fe- 
male (Nearctic) ..Hucalliphora lilaea (Walker), p. 284 
Front at narrowest 0.18 of head width in male, 0.32 in fe- 
male (Nearctic) Hucalliphora arta, new species, p. 287 
Seutellum with four or more strong lateral bristles; arista 
usually with long cilia almost to apex... -.. 5... 93 18 
Scutellum with three strong lateral bristles; arista usually 
ciliate only three-fourths the distance to the apex. .25 
Hindmost preintraalar bristle present .,........ 2m 19 
Hindmost preintraalar bristle absent (Holarctic)...... 
ee Aldrichina grahami (Aldrich), p. 290 
Three) postintraalar bristles ,.4: s.a..) ...). aa 20 
Two postintraalar-“bristles)s. .2...00.50.% ) 0. a 21 
Bucea reddish and 0.44 of eye height; front of male 0.13 
of head width; parafaciale opposite lunule in female 
0.89 of distance between vibrissae. (Nearctic)...... 
DP ac A AACR Calliphora coloradensis Hough, p. 294 
Bueea black and 0.82 of eye height; front of male 0.05 of 
head width; parafaciale opposite lunule in female 0.52 
of distance between vibrissae. (Nearctic).......... 
Ce) ea Calliphora lwida, new species, p. 296 
Bucea entirely black; basicosta black; male with front at — 
narrowest from 0.04 to 0.06 of head width....... "gta 22 
Bucea reddish on anterior half or more; basicosta often 
yellow to yellow orange; male with front at narrowest 
0.09. to. 010.0f head: widths:,( Holarctic).. 7.7. fee 
SES de, tape Calliphora vicina Robineau-Desvoidy, p. 307 - 
Cheek grooves yellow to orange red.................-. 23 
Cheek grooves black (Nearctic)........... 0.000000 0% 
r Ef tha hola een Calliphora mortica Shannon, p. 299 
