LIS SYRPHID®. 
second and third segments each with a somewhat distinct median 
band of grey pollen, narrowly interrupted in the middle and broader 
towards the sides; fourth segment with several of these bands, one 
after the other, but not very distinct. Genitalia black, with yellow 
pubescence ; belly black. Legs entirely black, the femora sparsely 
clothed witn pale hairs and “the tibia with short vellowish pu- 
hescence ; all the tarsi very thin, not flattened ; first joint of hind 
tarsi simple ; ; hind legs more robust than the anterior ones, but not 
thickened and entirely simple. Wings greyish hyaline, with brown 
veins and yellowish stigma; there is a broad infuscated pubescent 
patch from the small cross-vein to the tip of the wing, extending 
below to the lower corner of the discal cell. 
Type 3, a single specimen from British East Africa, collected 
by 7. J. Anderson. 
Genus 24. CHRYSOTOXUM, Meigen (1803). 
This genus seems to be very poorly represented in the Ethiopian 
Jtegion. 
Chrysotoxum continum, sp. n. 
Length of the body 13 mm. 
( “Tosely resembling Chr. intermedium, Meig. (¢talicum, Rond.), 
but distinguished by having the dark costal band on the wings less 
developed, and differing from any other European or North 
American species known to me in having the yellow lateral stripe 
on the thorax not interrupted at the suture. 
In the Second Part of my ‘ Ditteri Eritrei’ (1908) T considered 
the present species as an Ethiopian form of ¢atermedium; but 1 
now think it better to regard it as a distinct species, the only 
member of its genus ee from the Ethiopian Region. The 
Temale is to be found in the Museum of Florence, and another 
specimen in that of Budapest. 
There is no necessity for a detailed description, the species being 
almost like zrtermedium. 'The first two joints of the antennz are 
perhaps a little longer; dorsum of thorax more shining, especially 
behind ; the yellow lateral stripe is not interrupted, ona is of equal 
width from the shoulders to the postalar callus ; pleurze with the 
same spots as in zatermedium; scutellum yellow, with the same 
pellucid spot. Abdominal pattern the same, the yellow bands being, 
however, a little narrower as in all the specimens examined. Legs 
and wings the same, but the latter only faintly infuscated along 
the fore border, lacking the usual dark band near the end. 
Type 3 and two additional specimens from Nairobi, East Africa 
Protectorate, 5.v. 1911; another male specimen from 13 miles 
north of M'bagori’s Village, cons Meru, Kast Africa Protectorate, 
L3.xi. LOD, all collected by Mr. T. J. Anderson. 
