78 Mr. A. W. J. Pomeroy on new 



follows : — first main branch rather weak, consisting of four 

 long filaments arising dorsally from the stem at intervals ; 

 the remaining branches consist of four very stout finger-like 

 processes, very dark in colour, with secondary filaments of a 

 pale colour arising from them as follows : — from first finger 

 two long filaments arise together from the base, about half- 

 way up towards the apex a single long filament arises, and 

 near the apex another long filament, making four secondary 

 filaments in all; from the second finger two filaments arise 

 from the base, a third about halfway up, a fourth two-thirds 

 and a fifth a short distance from the apex ; from the third 

 finger only two filaments arise, one about two-thirds up and 

 the other a short distance from the apex ; the last finger is 

 not so thick as the preceding and is devoid of secondary fila- 

 ments. Pupa described from specimens containing male 

 adults dissected out and compared with type. The pupae 

 were also collected from the same locality and on the same 

 date as adult type. 



Simulium aureosi?nile, sp. n. 

 (PI. III. fig. 1 ; PI. IV. tig. 4.) 



Male. — Antenna brown. Thorax thickly covered with 

 rich red-golden pubescence. Pleura brown, lacking patch 

 of soft hair. Wings : radius uuforked. Legs : front legs, 

 coxae pale yellow ; femora pale yellow covered with light 

 golden hair ; tibiae, basal two-thirds yellow, apical third 

 brown ; tarsi all black. Hind legs : coxae black ; femora, 

 basal two-thirds yellow, apex black ; tibiae, basal two-thirds 

 yellow, apex black ; tarsi black, second tarsal joint with ex- 

 cision at base. Genitalia : basal pieces large ; claspers less 

 than length of basal pieces with single finger-like process at 

 apex of clasper ; anal plates not as large as claspers, with 18- 

 20 strong bristles at apex ; centre plate rather small, devoid 

 of bristles ; adminiculum very broad ; the pouch very 

 narrow, constricted, with many small bristles ; arms end 

 mesially in a single very prominent spine divided and 

 thickened at base. 



Hob, Bred from pupae found in slow-moving stream. The 

 pupae were attached to grass-blades and vegetation. 



Loc. Baliben, Kamerun, W. Africa, 10. 1. 1916. 



Type in British Museum. Described from a single adult 

 and some specimens dissected from pupa. 



Female. — Thorax dull black, sparsely covered with light 

 golden pubescence. Pleura brown, lacking the patch of 

 soft hairs. Wings : radius uuforked. Abdomen dull brown. 



