116 SYRPHID &. 
narrower than the thorax in the middle; hind femora greatly 
thickened, but flat, provided below near the end with a long and 
sharp plate which bears on its margin 8—10 very strong spines ; 
hind tibiz flattened, almost bare, shining. 
A male from Durban, 5.x. 1902 (£ Muir); a female from 
Salisbury, Mashonaland (G. A. AK. Marshall); another male from 
Chirinda Forest, S. Rhodesia, x. 1905 (G. A. A. Marshall). The 
type of the species was obtained in Belgian Congo. 
Eumerus obliquus, Fabricius (1805). 
Easily recognisable owing to its short and broad body, to the hind 
margin of ne seutellum being clothed with grey hair and not 
sharply produced, to the lengt h of the hair on the eyes, the great 
distinctness of the three pairs nares abdominal lunulie, and the strongly 
incrassate and very hairy hind tibie. 
Distributed throughout the Ethiopian Region. A male and 
three females from Obuasi, Ashanti, West “Africa: 2A. vi. 1907, 
“caught on flowers” (Dr. W. M. Graham) ; a female from Ayeze, 
S. Nigeria, 9.iv. 1911 (Dr. A. Connal); a female from Kembi, 
U ganda, iv. 1904 Lees E. D. W. Greig); a female from British 
East Africa (C. S. Betton), and another from British Central 
Africa (Dr. na ci S. Old); a nel from Durban, Natal, 24. x. 1902 
(F. Muir). 
Genus 28. AMPHOTERUS, nov. 
A strange insect, showing venation and scutellum of Eumerus, 
but with quite simple hind femora, and having the head and 
antenne of MWierodon. It differs from any other Syrphid genus 
yet known by the shortness of the first antennal joint and by the 
elongation of the second, which is much longer than the third. 
T was at first inclined to consider this insect as an Sabena Microdon 
with shortened first antennal joint; but on account of the venation 
IT now think it better to regard it asa Humerus with elongated 
second antennal joint. This connecting form between Humerus 
and Microdon is a very interesting novelty ; the discovery of its 
larva will probably explain the question. 
Body duil, strongly chitinized, deeply punctate. Head a little 
broader than the thorax; eves bare, shining, with equal facets, 
widely separated in the male, but with the inner angles approaching 
each other, and with the usual transverse furrow between the angles ; 
face broader than the frons, gently convex, comparatively narrow, 
without furrows; opening of bue cal cavity very small ; proboscis 
but little prominent; antennze longer than the face and pendulous; 
first joint exceedingly short, scare ‘ely noticeable below the lunula; 
second joint very long, thin, almost bare; third joint elongated, 
broader than the ¢ eseond and a little more than half its length ; 
arista very thin, bare, rather long, inserted rather far from the 
