On the Boiitbylitd Fauna of South Africa (Dipt era). 141 



except those of the first segment, with black short hairs and black 

 scales ; spines of ovipositor dark reddish ; venter black, with yellow 

 scales and black hairs. Legs entirely black, with black hairs and 

 partly black, partly yellowish scales on the femora; front pair less 

 abbreviated than in the allied species, with the tibiae rather slender 

 and with minute, less distinct spicules ; the tarsi rather long and with 

 the usual pubescence ; bristles black and long, 2 on middle femora 

 and a complete row on hind femora ; claws black, with acute tooth. 

 Wings entirely and equally blackened, with black basal hook and 

 black basal comb ; the black clouds at the usual places are very 

 faintly indicated ; praediscoidal spot whitish, small ; alula narrow, 

 blackened, with a long, dark brown fringe, like the base of the axillary 

 lobe. Venation typical for the group ; discal cross-vein before the 

 middle of the discoidal cell, the second longitudinal vein originating 

 before it ; first posterior cell a little bi'oader than the ;inal cell ; 

 second posterior cell a little broader than the third, the vein between 

 them bent forwards ; third posterior cell a little shorter than the 

 fourth. Apical cross-vein of the discoidal cell very strongly S-shaped, 

 and placed horizontally, the discoidal cell being as in LitorrJiynchus 

 verv narrow and elongate. 



EXOPROSOPA (ACRODISCA) OFFUSCATA, Sp. 11OV., g , $ . 



Allied to the preceding, but of greater size and with yellow legs and 

 with entirely yellowish-haired metapleurae. Some specimens from 

 Matjesfontein (Cape), November, 1910 ; Laingsburg (Cape), Novem- 

 ber, 1910 ; Springbok, November, 1890 ; Spektakel, Namaqualand 

 (Cape), October, 1890 (E. M. Lightfoot) ; O'Okiep, Namaqualand 

 (L. Pc'ringuey), October, 1885, labelled by Bigot " Exoprosopa melania," 

 Big. a name which has never been published. Length of body 12-13 

 mm. ; of a wing 14-16 mm. ; of wing spread 31-35 mm. Occiput 

 black, with whitish central fringe and yellowish scales which are 

 whitish below the indentation at the eye borders ; ocellar tubercle 

 very small and flat, black ; frons of about equal breadth in both sexes, 

 shining black, red above the antennae, clothed with black erect hairs 

 and with whitish scales ; face conical, very prominent, red, with a 

 more or less broad black spot in the middle underneath, clothed like 

 the f rons and with a dense black tuft at the upper mouth edge ; mouth 

 borders yellowish. Antennae with the first joint red and black- 

 haired ; second joint much shorter, globular, dark reddish ; third joint 

 black, elongate, conical, gradually tapering in a rather thin point with 

 a very short and stout style. Proboscis black, as long as the mouth ; 



