BRITISH SPECIES OF DIPTEROUS GENUS FANNIA 155 



The females of carteri, Mall., nigra, Mall., and umbrosa, Stn., 

 are undescribed, and the same sexes of manicata, Mg., and moid lis, 

 Hal, and sociella, Ztt, and simiiis, Stn., are hardly, if at all, 

 distinguishable. 



Species with at least the Hind Tibia translucent Yellow. 



1. haiiiata, Macq., $. Brownish black, thickly dusted with grey; 

 eyes separated by a narrow stripe, orbits distinctly silvered; 

 frons, epistome, and jowls projecting more than in the generality 

 of the species beyond the eyes ; antennae shorter than the face, 

 brownish black, arista bare; thorax thickly dusted with grey, 

 side margins rather whitish, dorsum with four rather indistinct 

 stripes ; on the underside of the pleurae between the fore and 

 mid coxae are two strong downward-directed thorns ; abdomen 

 thickly grey dusted, dorsum with a dark dorsal stripe rather 

 narrowly triangularly dilated at the apex of each segment ; anal 

 organ small, coloured as the abdomen; legs yellow; fore femora 

 except the under surface, fore tibia except the base, and the 

 whole of the tarsi, black-brown ; mid coxa with a strong down- 

 ward-directed, backward curved thorn ; mid femora rather 

 strong, distinctly contracted at the tip ; postero-ventral surface 

 with a row of bristles, which at the base are longer, but gradually 

 decrease in size as they advance, until beyond the middle they 

 form a rather thick series of about three parallel rows, occupy- 

 ing the entire apical half except the contracted portion, which 

 carries a clump of very short closely placed bristles; antero- 

 ventral surface with a row of about nine strong bristles on the 

 basal two-thirds, the other bristling normal ; mid tibia thickened 

 on the apical half, ventral side, and with rather long pubescence 

 on the thickened portion ; antero-dorsal surface with two bristles 

 on the apical half, the upper the weaker, the other bristling 

 normal ; the hind femora are not remarkably bristled, but the 

 hind tibiae have the whole of the ventral surfaces, except the 

 extreme base, clothed with very long curved bristle-like hairs, 

 those on the antero-ventral surface being stronger than those on 

 the postero-ventral surface ; besides the usual dorsal bristles, 

 and the one on the antero-dorsal surface, there are generally 

 three weaker bristles above the latter ; wings clear, yellow at the 

 base, third and fourth veins convergent, outer cross-vein nearly 

 straight ; calyptra unequal in size, yellow ; halteres yellow. 

 $ . In colour much the same as the $ ; eyes more widely 

 separated, at the widest part above the antennae, by about 

 one third the breadth of the head, at the ocelli by about 



