﻿Bonihyliidae {Diptern) 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 jjaler. 

 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 Ç 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 Uxoprosojm. 

 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 v^^ing-pattern. Mr. Verrallalso, 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. Firsi grouj). 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. — PART IV. (JAN.) TT 



