﻿122 Annals of 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). Squamae white or whitish ; second longitudinal veins less looped at 



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

 exceiJtion ; apex of wings hyaline, without dark spots. 



3 (6). lîasal black jjattern 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 dis- 

 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). AVings with a diffused pattern and with only 3 dark spots, 2 of 



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

 base of the first posterior cell . . . diffusus, 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 ..... aygidus, Fnhv. 



n (8). Species of smaller size, measuring only 6-7 mm. ; recurrent veinlet 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 Avings. 



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 Idack basal pattern reaches only the middle of the anal cell, and 



has a tooth-like projection on the discal cross-vein, fuscipcnnis, liic. 



Anthrax pithecius, Fabiicius (1805). 



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

 the peculiar wing pattern. 



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

 M'Fougosi, Zululand, October, 1Î»!! (W. E. Jones) ; Duubrody (Cape) 

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

 Khodesia (G. Arnold), September, 191 o; Salisbury (S. Rhodesia), 

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

 1882, was determined by Bigot as Exoprosopa reticulata Macq. (sicl). 

 I have received the species also from Grrahamstown (Cape). 



