626 Prof. Mario Begzi’s Report on a Collection of 
2 (1). Third joint less elongate and with longer style; dark mark- 
ing without pellucid spots; head, sentellum and abdomen 
black. 
3 (6). Wings with black veins and darkened or black costal cell ; 
colour of the body black ; notopleural hairs mostly black. 
4 (5). Wings hyaline, with the extreme base black and the costal cell 
darkened ; pleurae with black hairs. melanoplewrus, sp. 0. 
5 (4). Wings with the basal third dark brown, the basal cells being 
also included in the dark portion . . abruptus, Loew. 
6 (3). Costal cell hyaline ; wing veins partly yellow ; colour more 
greyish; notopleural hairs pale : ; . spp. ind, 
34. Thyridanthrax macquarti, sp. nov. (Plate L, fig. 5.) 
6 2. Length (of 7 specimens), 7 to 9 mm. 
An elegant species with conspicuously bright red abdomen and 
pellucid spots in the dark area of the wings. It agrees tolerably 
with the description of A. fenestralis, Macquart (1840), from the 
Cape, and is perhaps the same ; but in the specimens before me the 
two basal joints of the antennae are red, a thing of which Macquart 
says nothing ; in any case his name must be changed, because there 
is already another A. fenestrulis, Wied. (1830), from Brazil. 
Face wholly yellow, with white hairs ; frons also yellow, but black 
near the vertex and clothed with black erect hairs. Thorax black ; 
the hairs of the dorsum are denuded, but the sides show whitish 
hairs. Scutellum red, black at the base. Metapleural hairs and 
halteres white. Abdomen wholly red, with a basal triangular black 
spot, which usually reaches only the hind margin of the third seg- 
ment, but sometimes extends as a black median stripe to the last 
segment ; the hairs are denuded. Legs black, with the tips of the 
femora and tibiae red. Wings hyaline, yellowish towards the base ; 
in the middle there is a brown cross-band, in which are to be seen 
3-4 subpellucid spots at the cross-veins; this band does not reach 
the hind margin of the wings ; the tip of the discal cell is hyaline. 
Types ¢ 2 and five other specimens from North Nyasa, 
Fort Hill, September 26, 1909 (Dr. J. B. Davey). 
35. Thyridanthrax melanopleurus, sp. nov. (Plate L, 
fig. 6.) 
2. Length (of 5 specimens), 5-10 mm. 
A black species near linea, Loew, but distinguished by the black- 
haired pleurae. 
Head wholly black; face and frons clothed with black hairs, the 
last almost without pale pubescence ; antennae black, the third 
