168 Mr. J. R. Malloch on ELxotie Muscaride. 
Length 5-6 mm. 
Type and one male paratype, east side of Forest of the 
Aberdare Mts., B.E.A., 7300 feet, 24. 11.1911. 
Allotype, south edge of Kenia Forest, B.E.A., 5000 to 
6000 feet, 2. 11. 1911. Collected by T. J. Anderson, in 
whose honour the species is named, 
An aberrant species having the upper orbital setula in the 
male and the anterior intra-alar in both sexes absent. 
Subfamily Cawoszzym. 
Genus Pycgornora, Schiner. 
This genus has been distinguished from Cenosia by all 
authors, including Stein in his recent paper on the genera of 
the world, by the presence of the small wart-like protuberance 
near apex on ventral surface of hind tibia, which I find is 
present only in the male. The use of a sexual character for 
generic distinctions should be avoided, unless some character 
preferably correlated can be used to distinguish the opposite 
sex. Fortunately in Pygophora there are several characters 
that are possessed by both sexes in common, which can be 
depended upon to separate the members of the genus from 
Cenosia and allied genera, but only in the case of Frey does 
it appear that the general habitus and other characters have 
been considered apart from the protuberance on the hind 
tibia. The two species described by Frey from Ceylon, 
immaculipennis and lutescens, have been placed by Stein in 
the genus Cenosia in his catalogue, but they were correctly 
placed by theirdescriber. Two species described from Africa 
as Canosia humeralis and C. parvipuncta by Stein belong to 
Pygophora. The known distribution of the species of the 
genus thus extends to Australia, Formosa, Java, New 
Guinea, several of the East Indian Islands, Ceylon, and 
Africa. 
The genus differs from Canosia in having the arista 
remarkably long-haired to middle ; the eyes much narrowed 
on lower half ; frons much wider at anterior margin than at 
vertex, each orbit with 4 bristles, one in line with posterior 
ocellus, and 3 very strong ones anterior to it, the upper 
two very close together; mid tibia with no anterior and two 
postero-dorsal bristles ; hind tibia with one antero-ventral, 
two antero-dorsal, and two postero-dorsal bristles. 
