80 On new Species of African Simuliidse. 



general colour lustrous slate-blue, with a broad black medi;m 

 stripe and a broad black stripe on either side concave out- 

 wardly, abbreviated toward basal margin. Pleurae slate-grey, 

 lacking patch of soft hair near prothoracic spiracle. Abdo- 

 men velvet-black, first segment with fringe of dark golden- 

 brown hair, sides of abdomen with diagonal stripe of per- 

 laceous blue. Legs: front legs, coxse black; femora and 

 tibiae dark brown, with front of shining silver ; tarsi very 

 broad and black. Hind legs : coxse and femora black ; 

 tibia? black, basal third shining silver ; tarsi, first tarsal 

 joint shining silver, black at apex, remainder of tarsal joints 

 black ; second tarsal joint with excision near base. Genitalia -. 

 basal pieces about the same length as the claspers, having 

 the apex of the outer lateral margin projecting very strongly, 

 covered with very stout black bristles ; claspers the same 

 length as the basal pieces, with a single finger-like process 

 at apex and rather pointed ; anal plates — lateral pieces 

 prominent, with several strong bristles, centre piece broad ; 

 adminicnlum V-shaped, covered with very stout small tri- 

 angular spines and a fringe of short hair at the apex of the 

 pouch ; arms — the arms end mesially in two masses of very 

 black chitinous spines, the general appearance rather like a 

 brush. 



Pupa. — The filaments are rather pale and translucent in 

 structure. They are composed of eight main lobes, bulbous 

 and finger-like. The cephalic and caudal lobes very broad 

 in the middle, pointed toward the apex. These two lobes 

 are very often found split up the centre. The remaining 

 six arise from the base of the main stem in pairs, and in 

 some specimens a short broad secondary finger-like filament 

 is present attached to one of the middle filaments, usually 

 the first cephalic pair, about halfway up. 



Described from specimens containing male imagos dis- 

 sected out and compared with emerged adults, bred from 

 the same locality and at the same time. 



Hab. Swift-flowing mountain stream, attached to rocks in 

 large masses. 



Loc. Morogoro, Conquered Territory, E. Africa, 24. 11. 

 1917. 



No previous description of the male or pupa has been 

 published. The females bred from the same pupae were 

 compared with the type in the British Museum. The larva 

 will be described in a later paper. 



Specimens placed in the British Museum Collection. 



