CHRYSOGASTER. 17 
distinct spots; antennz inserted below the middle of the eyes, 
moderately short, dark yellowish brown; third joint as long as 
twice the first two joints together, narrow, rounded at the ‘tip ; 
arista long, quite bare. Thorax practically bare, with only a few 
short pile hairs on the sides of the back; dull blackish neous, 
black on the pleure, where is to be seen a little grey tomentum ; 
back without pattern, faintly striped, coarsely punctate. Scutellum 
large, quadrangular, margined, like the thorax; its exceedingly 
short hairs are inserted in distinct punctures. Plumule and 
squamule white, the thoracic one with a long white fringe ; halteres 
vellowish. Abdomen broad, flattened, and margined, the last seg- 
ment rounded; almost bare, its exceedingly short pubescence 
inserted in punctures, which on the sides are very coarse ; the sides 
are shining sneous, with a purple band on poste ‘ior margin of 
second and third segments; ou the back the first segment is black, 

Fig. 4.—Chrysogaster spiloptera, sp.n. Q. X 6. 
except at the sides, the second and third show a very broad velvety 
black band, which does not reach the sides, but is triangularly 
produced forwards, touching with its apex the hind border “of the 
preceding segment; fourth “seement almost entirely shining, with 
only a small black triangle in middle of fore border, emarginate 
behind. Venter shining black. Legs entirely black, short and robust, 
almost bare; basal joints of front and hind tarsi thickened, chiefly 
those of hind pair. Wings hyaline, yellowish towards the base and 
with yellowish stigma; the marginal cell contains two rounded brown 
spots near its end; ‘there are also two apical cross-bands, one beginning 
in the submarginal cell, just before the end of the marginal cell, 
and united with the dark border on the subapical cross-vein ; the 
other is less dark, placed just before the tip of the wing, crossing 
the marginal cell and the outer part of the first posterior cell; besides 
there are brown elongate cloudy patches in the middle of the sub- 
marginal cell, in the subapical cell, and in the discoidal cell. Sub- 
apical cross-vein recurrent. f 
Type Q,a single specimen from Obuasi, Ashanti, 1. ix. 1907, 
“caught in swamp” (De. TW. AL Graham). 
