Platypezidae. 



Head more or less semiglobiilar, as broad as or a little broader 

 than thorax, flat behind or here a little convex below. Eyes in male 

 large and touching for a long distance, in female smaller and broadly 

 separated. The eyes are bare; in the male the facets in the upper 

 half or more are enlarged, and in the inner eye-margin there is an 

 incision at the dividing line between the facets. The face is rather 

 low. The ocellar triangle has a pair of ocellar bristles, but in Platy- 

 peza only some hairs. In the male there are no vertical bristles, but 

 in the female a pair is present except in Platypeza. In the female 

 the frons has one or more fronto-orbital bristles, in Platypeza not, 

 the frons here with minute hairs about all over. The antennæ are 

 inserted near to each other, at or a little to somewhat below the 

 middle of the head; they are (always) six-jointed, the three last 

 joints forming an apical arista; the basal antennal joints are short, 

 the third compressed, shorter or longer, from almost equilateral 

 triangularly oval to three times as long as high at base; the two 

 basal joints of arista are short, but generally distinct. The second 

 antennal joint has small bristly hairs at apex, sometimes more or 

 fewer long hairs above. Epistoma is more or less separated from the 

 clieeks by a furrow, the cheeks generally broad. The jowls not or 

 almost not descending. Jowls and cheeks bare or hairy, in Opetia 

 with bristles. Whether there is a real oral cone with a free clypeus, 

 separated from epistoma and connected with pharynx I have not 

 been able to decide, but it seems to me to be so in Platypeza (and 

 after Peterson: Illinois Biol. Monogr. III, 1916, figs. 32 and 542 a, 

 it would also seem to be the case, as he figures what seems to be my 

 clypeus, his fronto-clypeus, connected with pharynx by the part 

 he terms tormae), and the facts seem here to be as in Lonchoptera, 

 Phorids and also Pipunculids; in Callimyia, on the other hånd, a 



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