On the Bonibyliid Fauna of South Africa {Diptera}. 161 



Origiually described from Nyassaland in my work on the Bomby- 

 liidae of the British Museum, there is a male specimen from M'Fongosi, 

 Zululand, March, 1917 (W. E. Jones). 



J. GROUP Busiitis. 



EXOPROSOPA (EXOPROSOPA) LUTEICOSTA, Bezzi, sp. nov. 



A species resembling in general facies E. heros or dux, but more 

 allied to major-batrachoides, and having the venation of the present 

 group, in which it may be provisionally placed. 



A male from Ovambolaucl, 1890-91 (E. W. Eriksson), and 2 

 specimens from Graham stown (Cape) in my collection ; there are 

 some other doubtful specimens from Touws River, Cape, and Potchef- 

 stroom, Transvaal (T. Ay res). 



I described the present species from East Africa, and the South 

 African specimens agree well with the types, but they are of larger 

 size and have more extended and darker wing-pattern. E. costalis, 

 Macquart, is perhaps allied, but it is said to have a venation like that 

 of E. Robertsi. 



Length of body 16-19 mm. ; of wing 17-20 mm. Head black ; the 

 fore half of f rons, the face and the mouth borders are of a pale reddish 

 colour ; occiput grey-dusted, with pale yellowish central fringe and 

 whitish ocular stripe ; postvertical furrow narrow ; vertex depressed 

 between the eyes ; f rons i of the head at vertex and -- at the antennae, 

 the upper half clothed with blackish erect hairs, the frontal half with 

 dense yellowish scales and pale yellowish hairs ; face bluntly convex, 

 not much produced, the sides with shining white scales and whitish 

 hairs at the mouth borders. Antennae with the first joint short, dark 

 brown, yellowish-haired ; third joint black, elongate, with a short 

 terminal style ; palpi and proboscis blackish, the latter a little pro- 

 jecting. Thorax black, with yellowish dust on the back, Avhich shows 

 3 longitudinal stripes ; collar eutii-ely yellowish like the hairs on the 

 sides ; bristles black ; pleurae entirely whitish-haired, even on the 

 metapleura. Scutelluni red, with a narrow black base, yellowish- 

 dusted, and with numerous black bristles at the hind border. Squamae 

 brownish yellow with a whitish fringe ; halteres brownish, with paler 

 knob. Abdomen broad and obtuse at end, entirely black ; the hairs 

 on the sides of the first segment whitish, those on the others alternately 

 blackish and yellowish ; the upper side is clothed with black scales 

 and has cross-bauds of white scales complete on the 2nd sides of the 

 3rd and 4th and also entire on the 6th and 7th ; venter black, with 

 white scales and hairs. Legs black, with yellowish scales on femora 

 11 



