14 SYRPHIDE. 
longer than twice the first two joints taken together. Thorax 
black, coarsely punctate, with short pale pubescence on the back 
and a tuft of white hairs on the mesopleure ; scutellum wholly 
black. =Squamule small, white; halteres white or yellowish. 
Abdomen wholly black, all the segments distinct, coarsely punctate 
and with short white hair, which forms more or less indistinct bands 
on the fore borders; in the male the second segment is a little 
narrower than the others, but not in the female; male genitalia 
small, black. Legs reddish yellow, with black cox ; Seen Gr black 
at the base, the hind pair more broadly ; hind: Liviee with a black 
ring. Wings hyaline, with a black stigma; the microscopic 
pubescence extends over all the surface, except on the basal 
cells. 
This species seems to vary, like its allies, in the colour of the 
abdomen and legs. 
Type 3, from Salisbury, 8. Rhodesia, collected by Ar. G. A. K. 
Marshall, in whose honour the species is named; another very 
small specimen (4 mm.) from Chirinda Forest, Maleate District, 
S. Rhodesia, v. 1905 (G. 4. K. Marshall), seems to belong to the 
same species; a male from the latter locality, vi. 1911 (C. #. A. 
Swynnerton), has the last segment of the abdomen with the 
genitalia red, and the black parts of the legs are red. 
Type @, from Obuasi, Ashanti, W. Africa, 4. vii. 1907 
(Dr. W. M. Graham); another specimen from same locality and 
collector, 8. ix. 1907, has the sides of the 8rd and 4th abdominal 
segments reddish; a third specimen from the same locality and 
collector, 9. vii. 1907, is smaller and shows a clear pterostigma. 
5. Paragus dolichocerus, sp. n. 
Q. Length 7 mm. 
A very robust species, distinguished from the preceding one by 
its very elongate third antennal joint and by the distinct bands of 
white hair on the abdomen. 

Fig. 3.—Paragus dolichocerus, sp. n. 
Antenna of Q (greatly enlarged), 
Frons shining black, almost without white spots on the sides ; 
face yellow ay a broad black stripe and the sides of the mouth 
black : hair on the face very sparse and short; pubescence on the 
eyes pale, short, not disposed i n stripes; antenne black, the third 
