142 SYRPHID&, 
diagnosis of wich, based on a @ from the Congo, was given by me 
in 1908. 'To separate C. congolensis from C. brunnetpennis is not 
altogether easy, but the following are the distinctive characters : 
(1) the black costal border of the wings does not extend beyond the 
third longitudinal vein; (2) the face is of a pale yellow colour, 
with two thin brown lines forming a median band, which is some- 
what dilated towards the middle; (3) there is no A-shaped strip? 
on the face. The antenne and legs, however, are reddish as in 
brunneipennis, and the hind femora are also without the vellow 
spot on the upper side. As Prof. Hervé-Bazin has only described 
the male (from Katanga), I will give here some notes on the 
female. : 
Face very produced beneath; frons in front grey-dusted towar ls 
the middle; antennal petiole blackish brown above and reddish 
below; all three antennal joints of almost equal length; occipital 
border at vertex very prominent, but narrow. Abdomen entirely 
similar to that of the mile, with a very long stalk and the distal 
portion expanded into an oval. 
Type Q,a single specimen from Uganda Protectorate, Doro or 
Durro Forest, Toro, 4,000 4,500 ft., 25-29. x. 1911 (S.A. Neav2). 
Cerioides bezzii, Herrvé- Bazin (1913). 
A small, short, very peculiar species, readily distinguishable owing 
to its sessile antenne, to the singular venation and characteristic 
pattern of the wings, and to the dacanel club being pear its 
is very probable that the present species is the same as C. divvsa, 
Walker. 
A single female specimen from Salisbury, Mashonaland (G. A. 4. 
Marshall) ); the type is from KE lisabethville, Katanga. 
Var. marginalis, var. n. 
2. Length of body 11 mm. 
Coloration as in the preceding, but the yellow hind berders of 
the abdominal segments are broader ; the hind femora have seare rely 
any yellow at the base; the wings have the costal border entire ly 
dark brown, from the base of the marginal cell to the apex of 
the wing. 
Type 2, a single specimen from Uganda Protectorate, Budongo 
Forest, Unyoro, 3,400 ft., 11-15. xii. L911 (S.A. Neave). 
In these two forms (bezz?¢ and marginatis) the vena spuria is thin, 
but strongly chitinized and deep black ; the first abdominal segment 
shows at the base, in front of the halteres, two distinct but short 
spines, one on each side, which are less developed in the species of 
the first group. 
