122 Annals <>/ the South African Museum. 



1 (2). Squamae dark brown ; second longitudinal vein deeply looped at 



end ; upper branch of the cubital fork with a second stump in the 

 middle ; wings with many confluent dark spots, 4-5 of which are 

 placed at apex ... . pithecius, Fabr. 



2 (1). Squamte white or whitish ; second longitudinal veins less looped at 



end ; upper branch without appendix in the middle, or only as an 

 exception ; apex of wings hyaline, without dark spots. 



3 (6). Basal black pattern of the wings extended over the discal cross-vein, 



filling out a great part of the marginal cell and the base of the 

 first submarginal and of the first posterior cell ; plumula with a 

 black fringe ; discal cross- vein placed before the middle of the clis- 

 coidal cell. 



4 (5). Wings with the brown pattern well defined and with 4 isolated 



dark spots, 3 of which placed on the lower vein of the discoidal 

 cell ; a hyaline spot in the dark base of the first posterior cell. 



hessii, Wied. 



5 (4). Wings with a diffused pattern and with only 3 dark spots, 2 of 



which are on the discoidal cell ; no distinct hyaline spot in the dark 

 base of the first posterior cell . . . diff-usus, Wied. 



6 (3). Basal black pattern not extended over the discal cross-vein; discal 



cross-vein usually placed on or after the middle of the discoidal cell. 



7 (10). Two distinct isolated dark spots in the hyaline part of the wings. 



8 (9). Species of great size, measuring 14-15 mm. in length; recurrent 



veinlet at the base of the upper branch of the cubital fork long ; 

 plumula white .... aygulus, Fabr. 



9 (8). Species of smaller size, measuring only 6-7 mm. ; recurrent veink-t at 



the base of upper branch short and often rudimentary ; plumula 

 black ...... pusillus, Wied. 



10 (7). No distinct dark isolated spots in the hyaline part of the wings. 



11 (12). The black basal pattern of the wings is limited by an oblique line 



extending from the end of the auxiliary vein to the end of the anal 

 cell, the extreme apex of which is hyaline . hemimelas, Speis. 



12 (11). The black basal pattern reaches only the middle of the anal cell, and 



has a tooth-like projection on the discal cross- vein, fltscipennis, Hie. 



ANTHRAX PITHECIUS, Fabricius (1805). 



A well-known and common African species, easily distinguished by 

 the peculiar wing pattern. 



Many specimens of both sexes, varying in size from 8'5 to 12 mm. 

 M'Fongosi, Zuluhiml, October, 1911 (W. E. Jones) ; Dunbrody (Cape) 

 (O'Neil) ; Potchefstroom, Transvaal (T. Ayres) ; Bulawayo, S. 

 Rhodesia (G. Arnold), September, 1913; Salisbury (S. Rhodesia), 

 January, 1914 (J. A. O'Neil). A specimen from Hex River, December, 

 1882, was determined by Bigot as Ex-oprosopa reticulata Macq. (sic I). 

 I have received the species also from G-rahamstown (Cape). 



