8 Annals of the South African Museum. 



8 (9). From the basal black part of wing springs an arched brown band, 



which is prolonged to the hind border along the sixth longitudinal 

 vein ....... delicalus, Wied. 



9 (8). Wings destitute of such a pattern . . mutilatus, sp. n. 



10 (5). The black pattern at the base of the wings very narrow, not 



extending over the basal cross-vein. 



11 (18). Species of greater size (10-14 mm.), with rather short pubescence, 



chiefly in the female, which has, besides, the thorax densely clothed 

 with white hairs ; discal cross-vein never placed before the middle of 

 the discoidal cell. 



12 (17). Second longitudinal vein straight; discal cross-vein placed on or 



after the middle of the discoidal cell ; basal comb strong. 



13 (16). Body stout and broad, 12-14 mm. in length ; wings with the black 



basal pattern more spread and extended over the alula ; discal cross- 

 vein after middle. 



14 (15). Abdomen black-haired, with a tuft of white hairs at end. 



analis, Fabr. 



15 (14). Abdomen with a row of fulvous spots along the middle line. 



fulvonotatus, Wied. 



16 (13). Body slender and narrower, about 10mm. in length; wings almost 



hyaline at base, darkened along the fore border to the end of the 

 costal cell ; discal cross-vein on middle . . acroleucus, sp. n. 



17 (12). Second longitudinal vein wavy; discal cross-vein on middle; basal 



comb small ; hind femora less spinose ; wings at base yellowish, with 

 hyaline or whitish alula . . . kilimandjaricus, Speis. 



IS (11). Species of smaller size, not reaching 10 mm. in length ; pubescence 

 longer, even in the female, the latter never densely white pilose 

 on thorax ; discal cross-vein always before the middle ; wings with 

 a very small basal comb. 



19 (20). Abdomen with a conspicuous tuft of bright fulvoiis hairs on the 



central part of the sides .... furiosus, Walk. 



20 (19). Abdomen destitute of such tufts on the sides. 



21 (22). Thorax and abdomen destitiite of golden-coloured pubescence ; face 



with the silvery hairs prevalent ; second posterior cell usually broad 

 at base and sessile ..... urnatus, Wied. 



22 (21). Thorax and abdomen with distinct golden tomentum below the black 



hairs, more abundant in the female ; face with the black hairs 

 prevalent ; second postei'ior cell very narrow at base and sometimes 

 stalked ...... mtirentris, Macq. 



BOMBYLIUS LATERALIS, Fabl'icius. 



Syst. Antl., 129, 3, 1805. 



An isolated species, very like bivittatiis, but on account of the 

 bristles of the head and thorax making a passage to the group of 

 mi cans ; the eyes of the male are coalesced for a short distance, and 

 the head has the shape of the species of the B. micans group. 



