TAXONOMY OF MUSCOIDEAN FLIES — TOWNSFND 97 



men cinereous pollinose, with a distinct golden tinge most noticeable 

 on scutellum. First abdominal segment, narrow hind margins of 

 second and third, and apical half of anal blackish, the black surface 

 of anal segment shining. Wings clear, tegulae whitish with a tawny 

 tinge. Legs black. 



Type.— Cat. No. 10,911, U. S. N. M. 



Subfamily MasicEratin^ 

 Genus Exorista Meigen and allies 



The genus Exorista, as restricted, has the cheeks wide, one-third 

 to one-half eye height; second antennal joint somewhat elongate, 

 and abdominal macrochaetae discal and marginal. 



Par exorista differs from Exorista in cheeks being not over one- 

 fourth eye height, second antennal joint not elongate, second aristal 

 joint usually elongate ; abdominal macrochaetae usually only mar- 

 ginal, but long discal bristles present, those on third segment ap- 

 proaching macrochaetae in character. 



The genus Carcelia Robineau-Desvoidy may be known by hav- 

 ing no long discal bristles on abdominal segments, all being short 

 and of even length. Macrochaetae only marginal. Cheeks not over 

 one-fourth eye height. Type, gttava Meigen. 



Nemorilla has cheeks not over one-fourth eye height, second an- 

 tennal joint elongate, second aristal joint short, macrochaetae discal 

 and marginal, hind tibiae weakly ciliate. 



EUSISYROPA, gen. nov. 



Proposed for Exorista blanda Osten-Sacken. Differs from Parex- 

 orista in possessing regularly arranged discal macrochaetae on ab- 

 dominal segments, without the erect and usually long bristly hairs 

 of that genus, and especially in the peculiar form of the abdomen in 

 both sexes. The latter is high, somewhat arched, slightly wedge- 

 shaped ventrally in female, and obliquely truncate downward and 

 forward at apex in profile. The female has these abdominal charac- 

 ters more marked, but the male also possesses them in a hardly less 

 degree. The female has the venter quite distinctly carinate. 



Eusisyropa blanda Osten-Sacken.- — This species has the legs and 

 second antennal joint more or less deeply blackish or brownish, 

 with usually only faint suggestions of yellowish or reddish. The 

 palpi have a reddish tinge. Both sexes have the parafrontals with 

 a slight golden tinge, and anal segment very distinctly golden. 

 There are two sternopleural bristles only. 



