Bombyliidae (Diptera) from Central Africa. 648 
black, with black hairs and bristles. Pattern of the wings as in 
dimidiata ; shape of discal cell intermediate between dimidiata 
and discriminata ; first posterior cell less narrowed at the end. 
TyPE ? and another 2 specimen from West Nyasa, 
Vitiya and Mzimba, June and October 1909 (Dr. HZ. S. 
Slannus). 
58. Hxoprosopa argyrophora, sp. nov. (Plate L, fig. 17.) 
¢. Length of the body 9 mm., of the wing 8 mm. 
A very small species near E. dimidiata, but distinguished by its 
silvery abdomen. Head black, with scanty pubescence and black 
hairs on the frons. Face short, conical ; proboscis not projecting ; 
antennae with the two basal joints black, the first with black hairs 
and short, third joint wanting. Thorax black and black-haired, 
with some grey hairs on the collar. Scutellum black, dark reddish 
at the hindedge. Halteres with a white knob. Abdomen black, the 
venter and the sides of the second to the fourth segments are yellowish ; 
first segment with white hairs on the sides ; second, third and fourth 
segments all covered with dense silvery scales and with white hairs 
on the sides; the remaining segments are black, with sparse white 
scales and black hairs. Legs black, the tibiae dark reddish ; hind 
claws short and with a small tooth. Wings as in E. dimidiata, but 
the black pattern more narrowed, filling only the basal third of the 
discal cell ; direction of the veins as in siymoidea, but the discal cell 
is more regular and its exterior cross-vein is not S-shaped. 
Tyre g, from West Nyasa, Momberas district, 
November 1909 (Dr. H. S. Stannus) ; a single specimen. 
59. Exoprosopa argentifrons, Macquart (1855). (Plate L, 
fig. 18.) 
A single specimen from West Nyasa, May 19, 1909 
(Dr. H. S. Stannus), which agrees well enough with the 
description. The first joint of the antennae and the legs 
are red; the marking on the wing is more brown than 
black. 
This and the following species belong to the group D of 
Loew; but I think that they are best placed with 
EL. dimidiata. 
60. Exoprosopa scaligera, sp. nov. (Plate L, fig. 19.) 
d- Length of the body 10 mm., of the wing 10 mm. 
Allied to the preceding species, but distinguished by the shorter 
antennae and the different shape of the wing-marking. 
Head black, dark reddish on the face, which bears whitish scales ; 
