Species of African Simuliidse. 79 



Legs : front legs black with traces of pubescence, coxae and 

 femora yellow ; tibiae, basal two-thirds yellow, apical third 

 black; tarsi all black. Hind legs: coxae black; femora pale 

 yellow, black at apex ; tibiae, basal third yellow, remainder 

 black ; tarsi all black ; second tarsal joint with excision at 

 at base ; claws with very large projecting tooth at base. 



Described from a single specimen reared from pupa and 

 others dksected from pupa. The very conspicuous feature 

 of the species is the yellowness of the upper part of the legs 

 and the tooth-like process at the base of the claw. 



Hab. Bred from pupa in slow-moving stream. Alt. 1000 

 metres. Not found biting. 



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



Pupa. — The pupal filaments are four in number. The 

 first two branches arise from the main stem near the base. 

 The third branch divides dichotomously a short distance from 

 the base. The filaments are very similar to those of S. aureum, 

 Fries, and to S. bracteatum, Coq., but differ in the way they 

 arise from the main stem. The pupa were determined from 

 specimens containing male adults dissected out and compared 

 with type. 



Simulium unicornutum, sp. n. (PI. III. fig. 2.) 



Pupa. — Length 2-2 # 3 mm. 



The pupal filaments are of a very unique character, con- 

 sisting of a single horseshoe-shaped tube, rather more 

 prominent cephalically, situated either side of the thorax. 

 The filament, the cephalic portion of which is about 1 mm. 

 in length, is attached at the usual position on the thorax 

 and the tubular extension leading from the base is present. 

 One of the specimens contained a male imago, but not 

 sufficiently well developed to permit of an accurate descrip- 

 tion. The writer is of the opinion, however, that the very 

 remarkable formation of the pupal filaments is sufficient to 

 warrant its description as a new species. 



Described from six specimens. Type in the British 

 Museum. 



Hab. Slow-moving mountain stream, attached to grass- 

 blades. 



Loc. Balibo, Kamerun, W. Africa, 12. 12. 1916. Altitude 

 about 2000 metres. 



Simulium damnosum , <$ , Theobald. 

 (PI. III. fig. 4 ; PI. IV. fig. 5.) 

 Male. — Length 2 mm. 

 Antennae, dark brown with grey pubescence. Thorax : 



