Diptera 
3 QI 
n. Mouth parts vestigial. Oestrid^e. See page 
297 for generic synopsis, 
nn. Mouth parts well developed. 
o. M1+2 straight, hence cell R& wide open in 
the margin; costa ending at the tip of R5; 
three stemopleurals present; antennal 
arista plumose. Syllegoptera. Europe. 
.... (Syllegopteriis) . . Dexiid.e in part 
00. M1+2 bent, hence cell R5 narrowed in the 
margin; stemopleurals rarely wanting, 
usually 1 :i or 0:1; facial plate strongly 
produced below vibrissal angle like the 
bridge of the nose; antennal arista bare. 
Parasitic on Hemiptera and Coleoptera. 
Allophora, Cistogaster, Clytia, Pliasia, 
etc. (Phasiin/e) . .Tachinid^e in part, 
mm. Conjunctiva of the ventral sclerites invisible 
(fig. 161a). 
n. Second ventral sclerite of the abdomen lying 
with its edges either upon or in contact with 
the ventral edges of the corresponding 
dorsal sclerite. 
o. Outermost posthumeral almost always lower 
(more ventrad) in position than the pre- 
sutural macrochaeta; fifth ventral abdomi¬ 
nal sclerite of the male cleft beyond the 
middle, often strongly developed; body 
color very frequently metallic green or 
blue, or yellow; arista plumose. (CALLI- 
phorin.*).MusciDjE in part. 
See page 303 for generic synopsis. 
00. Outermost posthumeral macrochaeta on 
level or higher (more dorsad) than the 
presutural macrochaeta; arista bare, pube¬ 
scent, or plumose only on the basal two- 
thirds; body coloring usually grayish 
(fig. 106) . SARCOPHAGIDiE 
p. Fifth ventral sclerite of the male either 
wanting or with the caudal margin 
straight; presutural intraalar rarely 
present . (Sarcophagus) 
q. Fifth ventral abdominal sclerite of the 
male much reduced, the remaining 
segments with straight posterior mar¬ 
gin, overlapping scale-like; in the 
female only segment one and two scale¬ 
like, the others wholly or in part 
covered; stemopleurals usually three 
or more. Sarcophaga and related 
genera. 
