152 E. E. AUSTEN. 



Head black or blackisli brown, occiput dark neutral grey poUinose, basi-occipitat 

 region thinly clothed with fine blackish brown hair ; ocelli present, enlarged facets 

 of eyes very coarse, area occupied thereby same as in $ of genotype (Tliriamheutes 

 singularis, Griinb., of Togoland and S. Nigeria), i.e., small facets confined to a deep 

 lower border and a narrower hind border of uniform width running up to ocelli ; 

 palpi blackish brown and clothed with fine hair of same colour, terminal joint 

 elongate and curved but not conspicuously swollen, considerably smaller and 

 narrower than in ^J of genotype ; antennal protuberance large and prominent, 

 considerably larger and more prominent than in (J of genotype ; first joint of 

 antennae blackish brown, short, swollen, cylindrical, and clothed like second joint 

 with blackish brown hair, second and third joints sepia-coloured, expanded portion 

 of third joint rather broad. Thorax and abdomen thinly clothed with fine blackish 

 brown hair. Wings : anal angle and lower region of distal extremity short of actual 

 tip paler than elsewhere with exception of clear, transverse streak, a close scrutiny, 

 when wing is viewed against a light back-ground, revealing beyond clear streak 

 an ill-defined transverse band, which appears somewhat darker than remainder of 

 surface ; stigma well developed, elongate, cinnamon-brown when seen against a 

 light background. Squamae blackish brown. Halteres : knobs ivory yellow, stalks 

 sepia-coloured. Legs : coxae, femora and tibiae clothed with blackish brown or 

 blackish hair, middle as well as front tibiae swollen (front and hind tarsi, and hind 

 tibiae missing in case of type). 



South Africa, Bechuanaland Protectorate : N'Gami Country, 1897 {Sir Frederick 

 Lugard, G.C.M.G., C.B., D.S.O.). 



The species characterised above is readily distinguishable by its wing-markings 

 alone, apart from all other characters, from Tliriamheutes singularis, Griinb. (the only 

 other member of its genus as yet described), in which moreover the body as well as 

 the head and its appendages are in the (J uniformly tawny. 



So far as it is possible to judge from a photograph, which is all that is at present 

 available for comparison, what appears to be another ^ of Tliriamheutes fuscus is 

 in the possession of Mr. E. W. Jack, Government Entomologist, Southern Rhodesia, 

 and was taken by him in November 1914, in Sebungwe District, Southern Rhodesia, 

 on the jacket of a companion. In Mr. Jack's specimen, however, the clear streak 

 in the wing reaches the hind margin, while the margin of the anal angle, and a further 

 portion of the hind border embracing part of the distal extremity of the second 

 submarginal cell and the distal extremities of the first three posterior cells are also 

 hyaline. 



