7G Mr. A. W. J. Pomeroy on new 



brown-grey with patch of soft silky hair near spiracle. 

 Wings hyaline, veins yellowish, radius unforked. Abdomen 

 dull purple-black, covered with rather brassy pubescence, the 

 seventh and eighth tergites rather bare and shiny, the fringe 

 of hair on the first segment distinctly short, almost absent 

 dorsal ly. Legs : front legs, coxae brown ; femora yellow, 

 apex brown ; tibiae, basal two-thirds yellow, remainder 

 dark brown ; tarsi very dark, almost black. Hind legs : 

 coxae light brown ; femora golden yellow, covered with 

 brassy pubescence, apex black ; tibiae, basal two-thirds 

 yellow, remainder dark brown ; tarsi, first tarsal joint — 

 basal third yellow, two-thirds covered with yellow pubes- 

 cence, remainder of tarsal joints black. The second tarsal 

 joint with excision near base ; hind claws with tooth at base 

 as in S. ornatum. 



Hab. Not found biting ; bred from pupae in quick-flowing 

 mountain stream. 



hoc. Bangan, Kamerun, W. Africa, 14. 2. 1916. Alt. 

 2200 metres. 



Paratype in British Museum. 



Pupa. — The pupal filaments consist of fourteen branches 

 arising from seven main stems and branching dichotomously 

 a short distance from the base. The filaments are very 

 strong in appearance, very dark and quite black at the apices, 

 which are sharp-pointed and very chitinous. Under a high 

 power the outer wall is seen to be covered with crescent- 

 shaped nodules, which are arranged in rows over the entire 

 surface. The pupa is described from specimens containing 

 adult males dissected out and compared with type. They 

 were also collected from the same locality on the same date. 



Siniulium medusaformis , sp. n. 

 (PI. III. fig. 6 ; PI. IV. fig. 2.) 



Male. — Length 2 mm. 



Antennce black, covered with fine short grey pubescence, 

 the two basal segments dirty yellow. Thorax velvet-black 

 covered with thick light golden pubescence (in the type- 

 specimen some of the pubescence has been rubbed off), 

 especially thick at the sides. Pleura brown with silver 

 sheen, lacking the patch of soft hairs near the spiracle. 

 Wings hyaline, radius unforked. Abdomen velvet- black, 

 first segment with long fringe of golden-brown hairs, a 

 diagonal broad patch of iridescent silver-grey on the sides 

 about the fifth and sixth segments; a fringe of long shining- 

 pale yellow hairs arises from the margins of the ventral 

 sclerites, covering the sides of the abdomen on the first five 



