﻿On the Bomhyliid Fauna of South Africa (Diptera.) 169 



Thyridanthrax transiens, Bezzi. 

 One specimen from S.W. Protectorate, Otjitno, January, 1920 

 (E. W. E. Tucker). 



EXOPROSOPA, Macq. 

 Exoprosopa (Exoprosopa) fastidiosa, sp. n. 



Near seniculus, but distinct by the middle dark band of the wings 

 being extended, through tlie apical half of the discoidal cell, to the 

 hind border of the wing, or nearly so. The type is from the Nyasaland 

 Protectorate ; the abdomen shows transverse bands of white scales 

 alone, Avhile in the present specimen the fourth and fifth segments 

 have yellowish bands like the second. Antennae entirely black. 



One female specimen from S.W. Protectorate, Grootfonteiu, January, 

 1920 (R. W. E. Tucker). 



Exoprosopa (Exoprosopa) hypargyra, sp. nov. 



Closely allied to seniculus and fastidiosa, but distinct from all the 

 known species of their group on account of the broad patch of silvery 

 scales on the sternapleura. 



Type $ , a single specimen from S.W. Protectorate, Tsumeb, 

 December, 1919 (R. W. E. Tucker). 



9 . Length of the body 12 mm. ; of the wing 12 mm. Head as in 

 seniculus, with not projecting proboscis ; antennae entirely black, with 

 the third joint elongate-conical as in fastidiosa. Thorax as in seniculus, 

 but tlie sternopleurae are completely clothed with silvery scales, thus 

 forming a broad triangular white spot, which is wanting in the allied 

 species. Abdomen and legs as in seniculus ; spines of the ovipositor 

 black. Wings with the same nervation, but the small cell being very 

 narrow at end and nearly closed (in seniculus and fastidiosa. it is 

 broadly open). The pattern is like that of seniculus, but the dark band 

 of the fore border is shorter, ending into the marginal cell a little 

 before the upper end of the marginal cross-vein (in the two other 

 species it ends on or a little beyond the cross-vein) ; the middle cross- 

 band is broad and long, crossing the discoidal cell on its apical third 

 (but leaving its extreme external apex hyaline), filling up the whole base 

 of the second posterior cell and entering into the upper part of the 

 third posterior cell. 



Exoprosopa (Exoprosopa) tuckbri, sp. nov. 



A species of the dimidiata-group and to be placed near it, distinct 



by the metapleural tuft being reddish yellow above and black below ; 



by the apical cross-vein of the discoidal cell being short, straight, and 



placed obliquely ; by the discoidal cell dilated at end at the upper 



