18 SYRPHID®. 
Chrysogaster (? Orthoneura) levigata, sp. n 
2. Length 45 to 5 mm. 
A glittering metallic species, which recalls our European Lio- 
gaster metallina, but has a very elongate linear third antennal 
joint, a velvety black transverse band on the second abdominal 
segment, and a dark cross-band on the wings before the tip. 
Head smaller than in the preceding species, with the frons 
shorter, the antennz being inserted above the middle of the eyes 
(not below as in C. spzloptera) ; entirely shining, metallic bluish, 
geneous on the lunula; frons with an arcuate prominence above 
the antennz and with two median longitudinal elevated lines, but 
without any trace of transverse furrows; it bears dark and sparse, 
but rather long, hairs; face rounded, less produced below, with 
sparse hairs; eves bare, adorned with two perpendicular dark bands, 
the space between which is equal to that on each side of them; 
antenne black, dark yellowish towards the base, widely separated ; 
third joint narrow, linear, three times as long as the first two 
together; arista bare. Thorax neous on the sides and on the 
pleure, purplish blue on the disc behind the suture; dorsum clothed 
with short pale hair. Scutellum neous, smaller than in the 
preceding species, margined, clothed with rather long hair, chiefly 
towards hind border. Squamule white, the thoracic pair with a 
long fringe; plumule and halteres pale yellowish. Abdomen 
entirely shining, with short pubescence; zneous at the base and 
sides and on the fourth segment, and violaceous in the middle of 
the dise; the second segment bears besides a velvety black band 
on the Hind border, which does not reach the sides and is rounded 
anteriorly, attaining the middle of the segment. Venter shining 
zneous, With coppery reflexions. Legs short and stout, with short 
pale pubescence; femora black, tibiz and tarsi reddish yellow. 
Wings hyaline, witn yellowish base and stigma; veins darkened 
towards the end; the subapical cross-band is ‘pale ‘brow n, and runs 
perpendicularly from. the subapical cross-vein to the end of the 
second longitudinal vein; the posterior cross-vein is also narrowly 
margined with fuscous ; subapical eross-vein but slightly recurrent, 
almost perpendicular. 
Type 9, and another specimen from Obuasi, Ashanti, 1. 1x. 1907, 
“caught hovering in swamp” (Dr. W. M. Graham). 
Genus 3. MELANOSTOMA, Schiner (1860). 
A number of ill-defined African forms of this genus have 
been described, the synonymy of which is given in the List 
ae 
With the material available I have distinguished the following 
forms, which perhaps can be reduced to five good species ; JZ. mel- 
linum, which I recorded in 1908 from Erythrxa, is doubtful, as 
this species does not seem to be represented in the Ethiopian 
Region :— 
