﻿On fhi' Bonihj/liid Fauna of Son fit Africa (Diplera). Ill 



the remainder, more densely near the antennae. Hairs of moustache 

 white or pale yellowish. Antennae entirely l)lack ; the short hairs on 

 their upper side ai'e l:)laclc, very long and dense ; the hairs of the under 

 side are white ; proboscis and palpi black. Thorax and pleurae entirely 

 black ; the back is clothed with a rather lono- and dense, pale yellowish 

 or dirty whitish pubescence, and with a little longer, numerous black 

 hairs. The bristles are black ; some have yellowish tips ; the pleurae are 

 shining, with tufts of whitish hairs only mi the propleurae and the 

 hind border of the mesoplevu-ae. Scutellum red, witii a narrow black 

 base, and liearing a pale yellowish pubescence, longer lilack hairs, and 

 yellowish bristles along the hind border. Squamae dirty yellowish, 

 with golden or whitish yellow fringe ; haltères with a dark stalk and 

 whitish knob. Aljdomen l)lack, with the hind border of each segment, 

 the first excepted, with a narrow but complete reddish-yellow band, 

 which is broader in the male; venter black, grey-dusted, Avitli long 

 whitish hairs. The pale yellowish or whitish pubescence of the upper 

 side is rather long and dense, chiefly on the sides of the first segment ; 

 in the female the pubescence on segments 1-5 is quite white, and 

 forms short bands on the ventral side of the hind liorder of the tei'gites. 

 Male genitalia red, the end of the abdomen in this sex is black 

 pilose l:)elow ; the ovipositor of the female appears provided with a 

 circlet of long spines, like that of some Exoprosopinae. Legs black, 

 grey-scaled; tibiae and basal joints of tarsi reddish yellow ; the coxae 

 are densely pilose, the hairs being white above and black below ; 

 all the femora are black spinose underneath, like the tibiae ; claws 

 black, Avith a reddish base ; pul villi dirty-yellowish. Wings wholly 

 hyaline, vitreous ; veins yellow, darkened outwardly ; cost a with black 

 hairs at the base, but the first vein is entirely bare. The dark spots 

 are on the short praefurca, on tlie discal cross-vein and on the 

 angulate base of the upper branch of the cubital fork : three smaller 

 and less distinct spots are situated on the base of the fourth posterior 

 cell, on the inner base of tlie third posterior cell, and on the base of 

 the second posterior cell ; sometimes there is also a less distinct spot 

 at the closed end of the first posterior cell. 



Subfamily LOMATIINAE. 



LOMATIA, Meigen (1822). 



The rather numerous South African species of this genus can be 



divided into three groups, based on the shape of the third antennal 



joint and on other characters. These groups are different from those 



proposed by Loew ; they are distinguished as follows : 



