90 ZOOLOGICAL EESULTS OP THE EUWENZORI EXPEDITION. 



yellow. Legs tawny, hind tibiae brownish, tarsi dark brown, hind femora with a dark 

 brown streak on outer side, broader on basal half. 



Hah. Ruwenzori, 7000-8000 ft. {G. F. Scott Elliot). 



Asarcina punctifrons is distinguished from A. rostrata Wied. and A. eremoj)hila 

 Lw. mter alia by the shorter and stouter first joint of the antennae, and by the first 

 and second black transverse bands on the abdomen being entirely parallel, and not in 

 the least expanded in the middle ; from A. amceria Austen, the new species may at 

 once be distinguished by the strongly infuscated wings and the presence of the dark 

 frontal spot. 



Subfamily Eeistalin^. 

 Sbnaspis Macq. 



Senaspis Macquart, Memoires de la Societe Nationale des Sciences, de I'Agriculture et des Arts, 

 de Lille, 1849 (Lille : 1850), p. 437 ; Dipteres Exotiques, 4= Supplement, 1850, p. 133. 



Plagiocera Loew (nee Macquart), Ofv. at' K. Vet.-Akad. Forhaudl. 1857, p. 381 j ' D-ie 

 Dipteren-Fauna Siidafrika's,' p. 317 [3.89] (1860). 



Senaspis .^sacus Walk. (Plate III. fig. 6.) 



Helophilus essacus Walker, 'List of the Specimens of Dipterous Insects in the Collection of 

 the British Museum,' part iii. 1849, p. 609. 



Plagiocera maculipennis Lw. Ofv. af K. "Vet.-Akad. Forhandl. 1857, loc. cit. ; ' Die Dipteren- 

 Fauna Siidafrika's,' loc. cit. 



(?) Eristalis latevittatus Bigot, ' Archives Entomologiques,' ii. 1858, p. 365, pi. x. fig. 9. 



1 ? , between Salt Lake and Wawamba Country, Euwenzori district {G. F. 

 Scott Elliot). Specimens of this species from Busoga, Uganda, March {Dr. Aubrey 

 Hodges), and Entebbe, Uganda, June, "taken in Laboratory" {C'aj)tain E. I). W. 

 Greig, I.M.S.), are also in the Museum collection, which includes other examples from 

 Ashanti and Sierra Leone, showing that S. cesacus has a very wide distribution in 

 Tropical Africa. If Eristalis latevittatus Big. be really a synonym of *S'. cesacus, the 

 species also occurs in Gaboon. 



vSenaspis elliotii, sp. n. (Plate III. fig. 7.) 



(S , $ . — Length, d (1 specimen) 15 mm., ? (4 specimens) 14 to 16 mm. ; width 

 of head, <S 5, 2 5'2 to 5-6 mm. ; width of front at vertex in ? 1 mm. to just over 

 1 mm.; length of wing, s 11'5, ? 12*5 to 13-5 mm. 



Blaclc ; abdomen shining hlacJc, dorsum of thorax covered with light yellowish-grey 

 pollen and thickly clothed with similarly coloured hair (in a $ from E. Africa the 

 dorsum of the thorax is deeper — buif-yellow) ; scutellum buff-yellow ; wings deep 

 furplish-brown from base to bottom of bend in third longitudinal vein above first 

 posterior cell, distal extremity and hind margin more or less distinctly paler, though 

 first posterior cell sometimes infuscated, proximal two-thirds of both basal cells and 



