20 SYRPHID®. 
black, unspotted ; hind femora with 
a black ring, hind tibie sometines 
entirely black; hind tarsi wholly 
black or with pale base .......... var. mauritianum, Big. 
12 (5) Legs mainly black, the front femora 
black at the base, the trochanters 
black, the hind legs wholly black 
or ovly with pale “knees; antenne 
almost entirely black ; second abdo- 
minal segment usually unspotted ; 
Wings more or less infuscated ...2  tnfuscatum, Beck. 
10. Melanostoma bituberculatum, Loew (1857). 
Allied to scalave, but at once distinguished by its double facial 
tubercle. 
It is worthy of note that Adams redescribed the present species 
as new 1n 1905, under the name given to it by Loew in 1857; he 
was misled perhaps by the fact that Loew placed his species under 
Syrphus. 
‘T'ypical examples have the antenne almost entirely and the 
lees entirely yellow; but there are specimens with very dark 
antenne and with darkened hind legs, or even with all the femora 
blackened. 
A typical couple from Durban (F. Muir); a male from Njaro, 
Brit. E. Africa (A. J. Cholinley), in which the yellow spots on 
third and fourth abdominal segments are fused together, forming a 
broad transverse band; the abdomen is ther afore wholly yellow, 
only the base and two narrow transverse lines being black. A 
ile and two females with darkened antenne and legs from Brit. 
K. Africa, E. side of the Aberdare Mountains, 7,300 ft., 24. 11.1911 
(T. J. Anderson). 
11. Melanostoma floripeta, Spezser (1910). 
A species distinguished by its comparatively large size, entirely 
yellow legs, very “broad rectangular yellow abdominal spots, and 
infuscated wings. 
This species is not closely allied to the following one, but has 
some resemblance to a Platychir us, as stated by De Speiser. Ori- 
ginally described from Kihmandjaro and Meru; there is a single 
hominis specimen from British E. Africa, M’ bagori’ s Village, edge 
of Kenia Forest, 5,000 ft., 12. 1.1911 (T. J. Anderson). 
12. Melanostoma scalare, Fabricius (1794). 
A well-known European species, characterised by its slightly 
pubescent arista, the narrow abdomen of the male, the triangular 
yellow rather long abdominal spots of the female, and the ppecnce 
of black rings on the legs. 
Two females from Mt. Chirinda, 8S. Rhodesia, vi. 1911 (C.F. M. 
Swynaerton) ; Dr. Speiser received the species from Kilimandjaro. 
