Dipt era 
299 
pp. Hair at the apex of the abdomen reddish 
yellow. Europe and America, 
q. Tibiae and tarsi yellow; femora black 
. H. lineata 
qq. Legs black with black hair; tips of 
hind tibia and tarsi yellowish brown 
. H. bovis 
00. Palpi small, globular; tibiae cylindrical, 
straight. On reindeer. O. tarandi 
. Oedemagena Latr. 
kk. Oral opening of the usual size; mouth parts not 
vestigial. 
1 . Hvpopleurals wanting; if three sternopleurals are 
present the arrangement is 1:2; conjunctiva 
(fig. 161 c) of the venter usually present; if the 
terminal section of M1+2 is bent it has neither fold 
nor appendage (AnthomyiiDjE of Girschner). 
m. Sternopleurals wanting; M1+2 straight toward 
the apex, costa ends at or slightly beyond the 
tip of R4+5; mouth parts vestigial . 
. GASTR0PHILIN>E. See OESTRIDiE 
mm. Sternopleurals present, if rarely absent then 
differing in other characters, 
n. Caudal margin of the fifth ventral abdominal 
sclerite of the male deeply notched on the 
median line usually to beyond the middle; 
abdomen often cylindrical or linear; abdomen 
often with four to eight spots; eyes of the 
male usually widely separated; stemo- 
pleurals three, arranged in an equilateral 
triangle; subapical seta of the hind tibia 
placed very low; M1+2 straight; anal vein 
abbreviated; wings not rilled. Ccenosia, 
Caricea, Dexiopsis, Hoplogaster, Schceno- 
myia, etc. (Ccenosin/e)* . 
. Anthomyiid.-e in part 
nn. Caudal margin of the fifth ventral abdominal 
sclerite of the male incurved, rarely deeply 
cleft, rarely entire, in a few' genera 
deeply two or three notched; M1+2 straight 
♦There are several genera of flies of the family Cordylurida (i.e. Acalyptratce ) which might be 
placed with the Anlhomyiida (i.e. Calyptrala ), owing to the relatively large size of their squamae. 
As there is no single character which will satisfactorily separate all doubtful genera of these two 
groups we must arbitrarily fix the limits. In general those forms on the border line having a 
costal spine, or lower squama larger than the upper, or the lower surface of the scutellum more 
or less pubescent, or the eyes of the male nearly or quite contiguous, or the eyes hairy, or the 
frontal setae decussate in the female; or any combination of these characters may at once be 
placed with the Anthomyiida. Those forms which lack these characteristics and have at least 
six abdominal segments (the first and second segments usually being more or less coalescent) 
are placed with the Acalyptrates. There are other acalyptrates with squamae of moderate size 
which have either no vibrissae, or have the subcosta either wholly lacking or coalescent in large 
part with R,, or have spotted wings; they, therefore will not be confused with the calyptrates. 
