608 Prof. Mario Os Report on a Collection of 
S. nigripes, Loew (1863), from the Cape is the same species, 
and both are very closely allied to the European S. lewco- 
phaeus, Meigen. The species is known from South and 
West Africa; in the collection are seven specimens of both 
sexes from West Nyasa, Mzimba, May and June 1909 
(Dr. H, S. Stannus). 
4. Systoechus robustus, sp. nov. (Plate L, fig. 1.) 
6 ¢. Length (3 specimens) 13 to 14mm.; proboscis 8 to 85 mm. 
A very robust species, easily distinguished by the short and dense 
yellowish pubescence of the body, there being no black hairs or 
bristles whatever on the thorax and abdomen. 
Eyes of the male somewhat widely separated, the front of the 
female being twice as wide as that of the male ; the median frontal 
furrow very little developed; all the hairs of head yellowish ; 
antennae black, the third joint very thin in the apical third, where 
it is yellow ; terminal style very minute ; proboscis black, 10 mm. 
long; ground colour of the head black, the sides of the mouth 
yellow. Thorax densely clothed with short greyish hairs, those on 
the sides being a little paler; prealar bristles whitish; scutellum 
dark red. Squamae brownish, with a dense fringe of white hairs; 
halteres white. Abdomen black, but in the male the sides and the 
hind margins of the segments are reddish ; the pubescence as on 
the thorax ; bristles wanting. Legs wholly reddish-yellow, only the 
trochanters and the last tarsal joints being black ; with scanty 
whitish tomentum ; all the bristles black, those of the hind femora 
very strong. Wings somewhat greyish, with a reddish-brown tinge 
on the basal portion, which extends from the end of the first vein 
obliquely to the basal cross-veins and to the middle of the anal cell. 
Basal comb strong, black ; veins mostly rufous, the first bright red ; 
second and third longitudinal veins closely approximated till the 
middle of the first posterior cell. 
This species seems to be allied to S. ferrugineus, Macq. 
(1834), from Senegal. 
Type gf, North Nyasa, on the road from Karonga to 
Fort Hill, near Chikwete’s village, May 21, 1909 (Dr. 
J, B. Davey). TypE 2, W. Nyasa, Mzimba, May 1909 
(Dr. H. S. Stannus). Another male specimen, in poor 
preservation and denuded, from the same locality as the 
female type. 
5, Systoechus simplex, Loew (1860). 
The species is known from South and East Africa. 
In the collection are two specimens which I refer with 
