Bombyliidae (Diptera) from Central Africa. 629 
strong and rough, like those on the pleura. Legs black and with 
black bristles; the tibiae are yellow, the two anterior pairs paler. 
Wings greyish hyaline, with black veins. The narrowed petiolated 
base is black to the basal cross-veins ; the limit of the black begins 
at the fore border a little after the end of the second vein, and runs 
obliquely to the third vein, to the small cross-vein, to the base of the 
discal cell, and to the middle of the anal cell; there are three pro- 
jecting black teeth, one at the base of the first submarginal cell, one 
on the middle cross-vein and one at the apex of the second basal 
cell. The very broad second basal cell bears at its end a pellucid 
spot. 
TyPE 2 from North Nyasa, Kaulunga Village, near 
Lufira River, July 18, 1909, collected by “Dr. J. B. Davey, 
in whose honour the species is named ; a single specimen. 
14. Litorrhynchus, Macquart (1840), 
I here regard this genus as distinct from Exoprosopa. 
The species have a restricted geographical distribution, 
being exclusively found in Central and South Africa ; : they 
may be distinguished by the characters of the proboscis 
and by the wing-pattern. Mr. Verrall also, in his masterly 
and splendid work on British Flies, V, p. 479, mentions 
this genus as a distinct one. 
I will give here the essential characters of the genus :— 
Face rounded, not conically projecting ; mouth opening more 
elevated ; proboscis at least twice as long as the head ; frons of the 
male broad ; style of the antennae longer than the third joint. The 
abdomen bears spots of silvery scales on the third segment ; the 
antennae and legs are partly red. Hind claws with a tooth. The 
origin of the second longitudinal vein takes place always opposite to 
the small cross-vein ; the basal vein of the second posterior cell is of 
equal length to that on the base of the third, and is placed in the 
same line with the axis of the wing. Pattern of the wings very 
uniform, consisting of two broad cross-bands of yellowish-brown or 
blackish colour. 
The species of this genus are fairly numerous and can 
be divided into two very distinct groups :— 
A. First growp. Pattern of the wings brown or yellowish- 
brown, not black; the vein dividing the second from the 
third posterior cell is extraordinarily bent against the fore 
margin of the wing, and therefore the third posterior cell 
is two or three times as broad as the second. Palpi of a 
TRANS, ENT. SOC. LOND. 1911.—PARTIV. (JAN.) TT 
