274. Mr. J. R. Malloch on Exotic Muscaride. 
Dimorphia flavithorax, sp. n. 
Female.—Head black, face brownish, frons with grey 
pruinescence, face silvery ; antenne and palpi yellow, but not 
so clear as in flavicornis. Thorax entirely yellow, the dorsum 
with the vitte indicated by whitish pruinescence, which is 
visible anteriorly when viewed from above and_ behind. 
Abdomen yellow, largely infuscated above. Legs yellow, 
tarsi brownish. Wings slightly yellowish. Calyptrz and 
halteres yellow. 
Frons a little less than one-third of the head-width; 
longest hairs on arista about twice as long as width of third 
antennal segment. Fore tibia without a median bristle ; 
mid-tibia with two or three posterior bristles; hind tibia 
with one antero-ventral and one antero-dorsal bristle. Apex 
of first posterior cell nearly as wide as that cell at outer 
cross-vein. 
Length 6-8 mm. 
Type, Malvern, Natal, vi. 1897 (G. A. K. Marshall). Para- 
type, Masai Reserve, B.E.A., 13. v. 1913 (7. J. Anderson). 
The first posterior cell in jlavicornis is much narrower at 
apex than in flavithorax ; in tristis it is about as wide as in 
the latter. 
Heuina, Robineau-Desvoidy. 
It appears to me pertinent to indicate that the above 
generic name is that which covers most of the exotic 
Muscaridz described by Stein as belonging to the genus 
Mydea. The latter genus when limited in scope to contain 
only those species which agree in characters with the geno- 
type, pagana, Fabricius, is found to be confined to the 
northern half of the two hemispheres—at least, so far as I 
have been able to discover. The closely related genus 
Myjiospila, R.-D., which is doubtfully distinct, occurs much 
farther south; I have seen species of this genus from 
Australia and South America. Many of Stein’s species 
originally described in M/ydea do not find their true affinities 
in Helina either, and new genera have been erected for their 
reception, some of them in this series of papers. 
Helina fuscoflava, sp. n. 
Female.—UHead testaceous yellow, frons red, upper half 
velvety black, orbits greyish pruinescent ; third antennal 
segment black, except at base; palpi rufous. Thorax 
