Mr. J. R. Miillocli on Exotic MuscarklfG. 233 



alar strong. Abdomen cylindrical, fourth visible tergite 

 depressed in centre at apex, fifth almost concealed, sixth 

 almost as long as fourth, setulose ; sternites Avith long, 

 rather dense hairs, the processes of fifth rounded at apices, 

 densely long-haired on tlieir entire length. Fore femur 

 M'ith long bristles on entire length of postero-ventral 

 surface ; fore tibia without conspicuous hairs, antero-doi'sai 

 surface with two short bristles, the posterior bristle absent ; 

 mesosternum slightly produced downwardly and armed at 

 apices with a dense brush or tuft of stiff' black bristles 

 which are curved caudad ; mid-legs missing ; hind femur 

 stout, with long hairs ventrally and some stout bristles on 

 apical half of antero-ventral surface, the postero-ventral 

 surface with one or two bristles beyond middle ; hind tibia 

 slender, produced into a blunt process at tip ventrally, 

 antero-dorsal surface with two bristles, postero-dorsal surface 

 bare. 



Female. — Differs from the male in having the hind tibia 

 simple at apex, and the postero-dorsal surface with three 

 short bristles. The fourth tergite is more conspicuously 

 depressed at apex than in the other species, presenting the 

 appearance of having a Y-shaped slit in centre of posterior 

 margin. 



Length 5-6 mm. 



Type, male, allotype, and one female para type, INIt. 

 Mlanje, Nyasaland, 14. xi. 1913, 6500 feet (S. A. ^Neave). 



Idiopt/gus trochanteratus, sp. n. 



Male. — Similar to the preceding species. Difl'ers in 

 having the spots on dorsum of abdomen very small, only the 

 pairs on tergites 2 and 3 and the one in centre of sixth 

 distinct. 



The abdomen has fewer and shorter hairs on the sternites 

 than in Idrtiventris, and the hind trochanters are armed 

 with a dense tuft of short stout bristles, the apices of which 

 are flexed backwardly, whereas in the preceding species 

 there are only fine haiis present. The mid-femur has fine 

 bristles on basal half of the ventral and antero-ventral 

 surfaces, which increase very much in length from base 

 apicad. In other respects as hirtiventris. 



Length 6" 5 mm. 



Type, Ulundi, Natal, ix. 1896, 5000-6500 feet (G. A. K. 

 Marshall). 



In addition to the species listed herein, Myiheu mirabilis, 

 Steiu^ evidently belongs to this genus. 



