Baccha marginata Bezzi, 1915:47

41. Baccha marginata, sp. n.

♂ Length of body 12 mm., of wing 10 mm.

Distinguished by the Golden pubescence on the thorax, by the yellow margins of the buccal cavity, and by the infuscated wings, which have a blackish fore border.

Head black; occiput with dark grey dusting, whitish on the sides below, and with the usual fringe of yellowish, rigid hairs;

vertical triangle black, short and very narrow, black-haired ;

frontal triangle aeneous, with some dark hairs above and on the sides ;

frontal tubercle rounded, prominent, violet-coloured, shining purple on the sides, with a semieircular depression above;

face shining aeneous above and towards the middle, grey-dusted on the sides yellowish below, the sides of the buecal cavity and the peristoma yellow, this last black behind ;

antennae dark luteous, the third joint short-oval ;

eyes with the middle brown band only, touching along a line which is a little longer than the vertical triangle

Thorax aeneous, without yellow markings, punctate, not very shining, clothed with depressed golden hairs;

pleurae: more shining, with longer golden hairs on the mesopleurae;

scutellum wholly aeneous, punetate, with very short and sparse hairs.

Squamule yellowish, with a short fringe ;

halteres yellowish.

Abdomen long and slender, almost linear; the hairs on the sides of the stalk are erect and yellowish, of medium length, the others are short and darker;

first segment aeneous in the middle, yellowish on the sides;

second entirely shining black, cylindrical, as long as the third;

third and fourth at the base each with two ill-defined yellowish spots, which are bifid behind ;

fifth entirely black;

genitalia shining aeneous, pale-haired ;

venter black, in the middle of the third and fourth segments there is a yellow spot, which is bifid behind.

The four front legs and the front coxae are yellow, the tarsi alone being darkened at the tip;

hind femora yellow, with a broad preapical black ring ;

hind tibiae blackish, with broad yellow base;

hind tarsi blackish, the first joint yellowish.

Wings of normal size, evenly infuseated with a yellowish-brown tinge, which is a little paler on the hind border near the base; fore border blackish in the costal, marginal, and end of submarginal cells to the end of the third vein ;

subcostal cell and stigma black third vein rather sinuous ;

seventh vein bent up at the end, and therefore the shape of the anal cell is like that in the broad-winged species, but not so accentuated.

The peculiar fleck at the end of the seeond basal cell is more conspicuous than usual in the clear-winged species ;

from this fleck issues, as in the other species, a vein-like fold which divides the upper cross-vein between the second basal and the discal cells.

Type ♂ , a single specimen from Obuasi, Ashanti, 8.xi.1907