12 SYRPHID4. 
6 (7) A slender species, with distinctly peti- 
olate abdomen, which is clothed with 
rather long and soft white hair; 
body lightly punctate; pterostigina 
subhyaline i eh SE eee. Saces, | longiventris, Loew. 
(G) Spesies more robust, with the abdomen 
only slightly constricted near the base 
or not constricted at all, and with 
very short hair; body very strongly 
punctate; pterostigma black or much 
infuscated, : 
8 (9) Third antennal joint grey, dark yellowish 
beneath, only twice as long as the 
first two joints together ; ‘abdomen 
with less distinct basal bands of white 
Wists vies eae Ba Sed tha lcdeis une 3 
9 (8) Third antennal joint ‘black, very long, 
almost four times as long as the first 
two joints together; abdomen with 
very distinct bands of white hair at 
the base of each segment .......... dolichocerus, sp. 1. 
10 (5) Face in both sexes with a black stripe ; 
wings pubescent at the tip and 
towards the hind border alone; 
species of smaller size, with the face 
much produced below and the vertical 
triangle of the male broad ..........  tébwalis, Fall. 
| 
marshalli, sp. n. 
1. Paragus serratus, Mubricius (1805). 
An easily recognised species, very distinct from any other (except 
the Chinese even vulatus, Thomson) owing to its serrated seutellum 
and carinate abdomen. Very widely distr ibuted in Africa south of 
the Sahara and common in British India. I have compared the 
African specimens with others from Calcutta and Trichinopoly in 
my collection. Verrall (1898), Brunetti (1908), de Meijere (1908), 
and I myself (1912) have mentioned the y variability of coloration 
in the abdomen and the legs of this species. 
A male from Mozambique, and one from Durban, both collected 
by F. Murr; another male specimen from Sierra Leone (©) ie Be 
Simpson) and one from Nyasaland (Dr. J. B.S. Old). 
2. Paragus borbonicus, Mucqguart (1842). 
A species obviously allied to the preceding one on account of the 
fused abdominal segments, but easily distinguished by the black, 
not serrated scutellum, and by the wholly yellow face of the male. 
The male, which was unknown to Loew, has a broad band of golden 
hairs in front of the thorax. 
This species also occurs throughout the Ethiopian Region. 
There are in the collection several specimens of both sexes from 
Zungeru, N. Nigeria, 27, xi. 1910 (Dr. J. W. 8S. Macfie), a 
male from Durban (#. Mur), and a female from Mozambique 
(FF. DMitiv). 
