1 ♀, collected in 1910 by Grauer in the "Moëra jungle" in the north-eastern corner of Congo State; in the collection of the Vienna Museum. 12.5 mm long, black with an almost uniform brick-red abdomen and some yellow markings; wings glass-clear with a black front edge.
The forehead, which is one seventh of the width of the head, is black, dusted with cinnamon-brown above the antennae, otherwise shiny, the underside of the face completely lemon yellow, slightly reddish, gradually turning brown towards the lower edge of the eyes and there, as well as the entire back of the head, covered with fine white-gray hairs. Proboscis and palps hidden, antennae with a brown-yellow third segment (poorly preserved).
Thorax, shield and back of the head black, somewhat shiny in places, otherwise covered with fine whitish-gray hairs, which shimmer slightly yellowish. The shoulder corners, a streak from there to the wing root, a streak of the same width vertically on the rear edge of the mesopleure and a related spot on the upper part of the sternopleure are lemon yellow.
Legs: Fore and middle hips and thighs are light leather yellow, tibiae and tarsi only slightly darker. The fore tibiae show the hindmost of a dark ring in the middle at the back, the fore metatarsus is 1/3 as long as the tibiae and almost as long as the other 4 tarsal segments together. The hind hips are brown, the hind thighs are very slightly dorsoventrally curved, brownish-yellow and very darkened slightly behind the middle, which appears to be lighter towards the end only less than towards the root. Hints are brown, lighter brownish in the base quarter, appearing very slightly curved as they are slightly thickened in the middle and at the end. Posterior metatarsus almost 3/4 of the tibia long, 1/4 longer than the other tarsal segments combined, reddish-brown and, like the tarsi of the same color, covered in bright red-brown hairs on the sole.
Wing: The wings are fairly broad, with a distinct axillary lobe, which distinguishes the species from the B. conifrons Bezzi from Ashantiland, which has a similar wing pattern. They are mostly glass-clear, the root or costal cell is slightly browned, the front (main) branch of the radial is accompanied from the root by a deep inky black line, which fills the entire lower edge cell as a broad, deep black edge border from the end of the edge cell and then also continues with the same width, but becoming a little more sooty brown, with the edge vein to the wing tip or the mouth of r4+5. The longitudinal vein r2 +3 runs almost completely parallel to r1 and only makes a very shallow wave fluctuation shortly before the opening, like an infinitesimal sign, so insignificant that the opening does not give the impression that it is rising towards the front edge. Accordingly, the second lower edge cell is somewhat bulbous in the middle and narrows a little more noticeably before the end of the edge, but it runs out almost parallel. The transverse vein, which closes off the first rear edge cell, is strongly bent in an S-shape, so that it is perpendicular to both longitudinal veins; the lower angle of the second rear edge cell is also almost right, while the upper one is about 75°; otherwise nothing can be said about the veins. The vibrators are brownish yellow.
Abdomen The abdomen has the usual form characteristic of the genus, is brownish brick red, the widened base of the first segment is reddish yellow, the middle and the end of the first, as well as the end of the second on the sides, an indistinct fine central longitudinal line on the second to fourth segments and almost the entire fifth and sixth segments are more mahogany brown, the belly side is uniformly brick red.
The wing markings of the species are therefore very reminiscent of the oriental species B. amphithoë Wlk. and B. Meijerei Kert., both of which, however, undoubtedly differ in the yellow scutellaria? in the basic colour.
unless otherwise stated