Gombyluidae (Diptera) from Central Africa. 619 
The frons bears erect black hairs and dense whitish pubescence ; 
face whitish grey, bare below the antennae, the whitish hairs being 
confined to the inferior portion. Antennae very short, grey. Ocei- 
put with whitish scale-like hairs and a short fringe of white hairs. 
Thorax clothed with erect black hairs and short grey pubescence. 
The bristles are black ; the hairs on the pleurae are white. Seutel- 
lum with the same clothing as the thorax and with strong black 
bristles on the margin. Halteres white, with yellowish stalk. 
Abdomen black, with yellow borders on the hind margin of the 
segments, clothed with grey pubescence and erect black hairs; the 
hairs on the sides are longer, but scales are wanting, the second and 
fourth segments only bearing atuft of black hairs ; marginal bristles 
of the last segments long and strong. Underside grey, yellowish at 
the tip, with white hairs; genitalia shining red, black at the base, 
the plate with a short black fringe. Legs black, with white scales 
and black bristles ; tibiae reddish. Wings wholly hyaline, narrowly 
luteous at the extreme base. A small brown spot after the origin of 
the third vein ; the small cross-vein and the base of the second vein 
placed just opposite to it are margined with fuscous, forming one 
dark spot ; the cross-vein at the end of the second basal cell is also 
slightly infuscated. The recurrent stumps are very long; the 
second vein is sinuous at the tip; the first posterior cell is narrowed 
at the end ; the small cross-vein is placed before the middle of the 
discal cell ; the lower vein of the discal cell is very sinuous; anal 
cell closed atthe margin. The veins are black, the first, however, 
being luteous, i 
Type ¢ and another specimen from North Nyasa, Aka- 
manga, South Rukuru River, October 10, 1909 (Dr. J. B. 
Davey). 
23. Molybdamoeba decipiens, sp. nov. 
¢@. Length (of 10 specimens), 7-12 mm. 
This species differs from all the preceding ones by its prevalent 
black colour. It is very closely allied to the Mediterranean M. tri- 
punctata, Wied., but differs in the colour of the legs, which are in 
great part yellow ; indeed, the front and middle femora near the 
end, the tibiae, and some basal joints of the front and middle tarsi, 
are yellow. The white scales on the abdomen are more developed. 
The male genitalia are red with black base, and not prominent. The 
underside of the abdomen bears long white hairs, which are wanting 
in M. tripwnctata. Pattern of the wings and direction of the veins 
the same as in M. tripunctata. 
The female is very similar to the male; the tuft of hairs on the 
genitalia is light yellow. 
