32 SYKIMIIDJ.. 



with a dullish less distinct transverse grey band, black-haired on 

 the middle, the vertical portion bare (perhaps denuded?); the 

 frons is depressed in the middle, the supra-antennal tubercle being 

 therefore very prominent ; face covered with dense grey tomentum, 

 which conceals the ground-colour, and with a shining median black 

 stripe extending to the base of the antennae ; facial tubercle rather 

 prominent ; sides of the face clothed with long pale hairs ; peri- 

 stoma narrow, wholly black ; postocular border with long hair ; 

 eyes covered with dense hair, which above is darker and short ; 

 antenna? black, almost reaching the epistoma ; third joint very 

 swollen, grey tomentose ; arista yellowish. Thorax as in the pre- 

 ceding species ; scutellum swollen, pale yellow and with pale hair. 

 Squamulae dirty whitish, halteres white. Abdomen clothed on its 

 whole length with rather long pale hair, chiefly on the sides ; it is 

 all bluish black and shining, the second and third segments with a 

 narrow basal whitish band, which is yellow by transparency, the 

 band on the third being closer to the fore border ; fourth segment 

 with a slight trace of a similar but darker band on the sides only ; 

 fifth entirely black. Venter black, with greyish bands and long 

 yellowish hairs. Legs black ; the four anterior tibiae and the knees 

 of the hind legs yellow ; first joint of hind tarsi very swollen, as 

 long as the other joints taken together. Wings as in the preceding 

 species, but the stigma blackened at base, the hyaline portion 

 before it being more distinct ; third vein almost straight. 



Type 2 , from Mpumu, Uganda, 22. v. 1910 (Dr. C. A. 

 Wiggins)-, a single specimen. 



24. Syrphus adligatus, Wiedemann (1824). 



Very distinct, owing to the broad yellow band on the third 

 abdominal segment and the dullish thorax. 



This species seems to be variable in the size and number of the 

 yellow abdominal bands, in the colour of legs and wings, and in the 

 hair of the face varying from pale to black. I have attempted to 

 distinguish the following three forms : 



(a) adligatus (typical). 



The band on second segment is narrow, that on third broad, and 

 that on fourth more or less broad ; the legs pale ; the wings greyish 

 hyaline. This agrees with the form figured by Mr. Austen in 1909 

 (Trans. Zool. Soc. xix. pi. iii. fig. 3), except that the end of the 

 abdomen is not yellow and the legs are not so black. 



Two males and a female from Durban (F. Muir) ; a male from 

 Marsabit, British East Africa (E. J. Stordy) ; a female from 

 Mt. Kenia, W. side, Meru-Nyeri lid., 6,500 ft., 20. ii. 1911 (S. A. 

 Neave). Dr. Speiser has recorded the species from Kilimandjaro. 



(b) tricolor, Walker (1852). 



Distinguished by the wings being infuscated basally and by the 

 yellow abdominal bands being much broader, chiefly those on the 

 second and fourth segments. 



