14 SYRPHIDJE. 



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 mesopleura? ; scutellum wholly 

 black. Scjuamulae 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 coxa3 ; femora black 

 at the base, the hind pair more broadly ; hind tibiae 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 tf , from Salisbury, S. Rhodesia, collected by Mr. Gr. A, K. 

 Marshall, in whose honour the species is named; another very 

 small specimen (4 mm.) from Chirinda Forest, Melsetter District, 

 S. Khodesia, v. 1905 (Q-. A. K. Marshall}, seems to belong to the 

 same species; a male from the latter locality, vi. 1911 ((7. F. M. 

 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 3rd 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. 



$ . 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 (greatly enlarged). 



Frons shining black, almost without white spots on the sides ; 

 face yellow with 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 in stripes ; antennae black, the third 



