Mr. J. R. Mallocli on Exotic MuscaridsB. 273 



posterior bristles ; hind femur with a complete series of 

 antero-ventral bristles and a series of finer bristles on basal 

 half of postero-ventral surface ; hind tibia with one or two 

 autero-ventral, two antero-dorsal, and two postero-dorsal 

 bristles. Outer cross-veiu much curved. 



Female. — Frons a little less than one-third of the head- 

 width, orbits narrow. Mid and hind femora lacking the 

 postero- ventral series of fine bristles. 



Length 7-8 mm. 



Type, male, and allotype, Victoria, Australia (C. French). 



Genus Dimorphia, nov. 



Generic characters. — Similar to Muscina, R.-D., in general 

 habitus. Prostemum, pteropleura, hypopleura, declivous 

 postero-lateral part of mesonotum, and ventral surface of 

 scutellum bare. Cephalic characters as in Helina. R.-D. 

 Arista plumose. Hind tibia without calcar on postero-dorsal 

 surface and no setuke on that surface. Anterior iotra-alar 

 bristle present but weak in female, absent in male ; scutellum 

 elongated, subtriangular; prealar short, but strong. Abdomen 

 ovate. Base of auxiliary vein, stem of veins 2-|-3 above and 

 below, and vein 3 for a variable distance beyond the furcation 

 setulose in both sexes, and fourth vein setulose on the 

 greater portion of its length above and below in female, 

 rarely sparsely setulose in male ; fourth vein distinctly 

 curved forward at apex. 



Genotype, Cyrtoneijra flavicornis, Macquart. 



One other described species known to me, Anihomyia 

 tristis, Wiedemann {Spihgaster laterittata. Bigot, Anihymyia 

 suhpunctata, Walker), belongs to this genus. It has the 

 antennae and palpi black or fuscous, while jiacicontis has 

 both yellow. 



Stein lists four species with the name flaricomis in his 

 composite genus Mydaa in his recent catalogue of the 

 world's species of Authomyiidse. Not one of the species so 

 listed was described in that genus, and but one, flatricomis, 

 Coquillett, belongs to the genus Mydaa in the strict sense. 



I have before me specimens of tristis from British East 

 Africa and Natal, and of jiacicvrnis from the same localities 

 and from north of Mt. Keuia. 



In addition to the foregoing I have what appears to be an 

 undescriljed species of the genus, closely related to flaci- 

 cornis, which is briefly characterised below. 



