132 Annals of th? South African Museum. 



Type (J and type $ , a single couple of not well-preserved specimens 

 from Namaqualand, Springbok, November, 1890 (R. M. Lightfoot). 



cJ, 9- Length of the body 8'5-10 mm.; of the wing 8-9 mm. 

 Head yellowish black at vertex and on the occiput ; it is densely 

 clothed with a short, yellowish, equal pubescence ; on the sides of the 

 occiput, near the eyes, the pubescence is more scaly and more yellow, 

 and on frons and face it is more erect and of a more golden colour, 

 chiefly on the lower part of the face. Antennae with the 2 basal 

 joints red and the third black with a red base. Proboscis dark 

 reddish above and black with yellowish hairs. Thorax black on the 

 back, reddish on the humeral, calli, on the postalar calli and on the 

 pleurae ; it is densely clothed with a short, yellowish pubescence, 

 which on the pleurae is longer and more erect, forming dense tufts on 

 the propleurae, on the notopleural line, on the mesopleurae, and on the 

 upper part of metapleurae. Scutellum reddish with a black base, 

 clothed like the back of thorax. Halteres and squamulae whitish. 

 Abdomen reddish, the segments from the 1st to the 4th with a broad, 

 black, transverse basal band that does not reach the sides and 

 decreases in size from the basal to the 4th segment ; it is clothed with 

 dense pale yellowish hairs which are longer and paler at the sides 

 near the base ; genitalia reddish yellow ; spines of the ovipositor red ; 

 venter wholly reddish, with a narrow whitish hind border of the 

 segments and with a short yellow pubescence. Legs entirely of a 

 pale reddish-yellow colour from the coxae to the end of the tarsi, and 

 clothed with a pale yellowish, scaly pubescence ; spines and spicules 

 black ; pulvilli yellowish ; claws red, with black tips. Wings hyaline, 

 with the basal fore half infuscated to the end of the subcostal cell and 

 to the base of the first submargiual, of the first posterior and of the 

 iliscoidal cells ; this infuscation is darker towards the middle, but is 

 not sharply defined at the hind border. Veins reddish, with fuscous 

 ends ; ambient vein black ; basal hook yellow ; basal comb with black 

 bristles, but clothed with a yellowish tornentum ; axillary lobe hyaline ; 

 alula yellowish. 



THYRIDANTHRAX, Osteu Sacken (1886). 



This genus is taken here in a wider sense for the reception of those 

 species of Anthrax (aiictornm) which have smooth front tibiae, rather 

 long proboscis, conical and prominent third autenual joint and often a 

 conical face. The wings have usually an extended pattern, but they 

 may also be completely hyaline. The species are as follows : 



