154 Annals of the South African Museum. 



notum ; ventral stripe near the sternum and including all the coxae ; 

 prosternum beneath yellow ; niesosteruum with a large oval yellow spot 

 beneath. Halteres brown, the knobs darker. Legs with the coxae 

 and trochanters black ; femora dark brown, the tips black ; tibiae and 

 tarsi black. Wings with a pale yellowish-brown tinge ; no stigma ; 

 veins brown. Venation (Plate XI, fig. 18), Sc long extending about 

 one-third to one-quarter the length of the long sector ; Sc 2 indistinct ; 

 Rs very long ; R 2 + :i short, less than R. 2 ; cross-vein r present but in- 

 distinct, connecting with R 2 ; basal deflection of R 4 -\-^, and r-m about 

 on a line ; basal deflection of M } + 2 obliterated ; cross-vein m lacking 

 so that cell M 2 is undivided ; fusion of M% with Cu^ very extensive, 

 Cu^ alone being about as long as the r-m cross-vein. 



Abdomen banded black and yellow, tigrine in appearance, the segments 

 black with broad caudal margins of bright yellow ; hypopygium black. 



Habitat. South Africa. 



Holotype, , Hottentot-Hollands Mountains, altitude 4000 ft., 

 Caledon, Cape Colony, 1915 (Barnard). 



Type in the South African Museum. 



This interesting little fly is not like the typical members of the 

 sub-genus in the manner that cell 1st M 2 is open. The very short fork 

 of Cu\ and M 3 is strongly suggestive of the possibility of the loss of one 

 of these veins by complete fusion to the wing-margin, a very rare con- 

 dition in this family of flies, the only other comparable case known to 

 the author being certain species of the Neotropical genus Polymera. 



GEN. MONGOMA, Westwood. 

 1881. Trans. But. Soc. Loud., p. 364. 



MONGOMA EXORNATA, Bergroth. 

 1888. Ent. Tidskrift, vol. 9, pp. 135, 136 (Trentepohlia). 



This interesting fly has a rather extensive range in Eastern and 

 South-Easteru Africa, as given by the author in an earlier paper 

 (Can. Ent., vol. 44, p. 204, 1912) ; a specimen in the collection from 

 the Bluff, Durban, Natal, August, 1915 (Marley). 



GEN. CONOSIA, van der Wulp. 

 1880. Tijd. v. Entomol., vol. 23, p. 159. 



CONOSIA IRRORATA, Wiedemanu. 



This is a very widely distributed species that is found practically 

 throughout the tropics of the Old World. Five <^,9> M'fongosi, 

 Zululand, February, 1914 (W. E. Jones). 



