﻿116 ERNEST E. AUSTEN — NEW AFRICAN 



segments cream-buff or cream-coloured : dorsum in Q marked as shown in fig. 1, 

 and clothed mainly with minute, appressed, blackish hairs, lateral margins and 

 posterior angles of first six segments, as also bases of median triangles clothed 

 with whitish hair ; venter in Q greyish ochraceous-buff, hind margins of second 

 and following segments cream-buff or cream-coloured, second to sixth segments 

 inclusive clothed with minute, appressed, glistening whitish hairs, which are 

 longer than elsewhere at each lateral extremity of hind border of sixth segment, 

 last segment clothed with blackish hair. Wings narrow and elongate ; auxiliary 

 and first longitudinal veins, and bases of second, third, and fifth longitudinal 

 veins cinnamon or mummy-brown, remaining veins for most part dark brown ; 

 stigma either indistinguishable, or narrow, elongate, raw-umber-coloured, and not 

 sharply defined. Squamae shining and glassy, with a faint yellowish tinge. 

 Halteres clove-brown, stalks paler, tips of knobs also occasionally pale. Legs : 

 coxae slate-grey or dark grey (front pair in Q more or less fawn-coloured beneath 

 the usual pollinose covering), clothed with whitish hair ; femora and tibiae russet- 

 brown or cinnamon-rufous, in $ proximal third and distal extremities of front 

 femora, distal extremities and an elongate blotch on under side of base of middle 

 femora, and under surface and tips of hind femora clove-brown, distal halves of 

 front tibiae in $ clove-brown beneath, tips of hind tibiae in $ also clove-brown, 

 distal extremities of tibiae in Q dark brown or brownish ; femora clothed with 

 whitish hair, hind tibiae in $ with a fringe of fairly long, dark brown hair on 

 both inner and outer surfaces, hind tibiae in Q with a fringe of very short hair 

 on outer side, sometimes wholly whitish, sometimes dark brown except at base ; 

 tarsi clove-brown in both sexes, proximal half or two-thirds of first joint of 

 middle or of both middle and hind tarsi more or less distinctly cinnamon-rufous 

 or chestnut ; apical spines on hind tibiae small. 



North-Eastern Rhodesia : type of c?, type of Q, and two para-types of 

 each sex, on road between Petauke and Hargreaves, Luangwa Valley, 16. ix. 

 1910, "at water-hole" ; additional para-types as follows: — 2 c?c?? 1 Q,near 

 mouth of Lusangazi River, Luangwa Valley, 1-3. ix. 1910 ; 1 Q, Chirimanyama 

 Stream, 8 miles south of Hargreaves, 11. ix. 1910 ; 1 Q, Lower Luangwa River, 



13. ix. 1910; 8 c? c? 5 8 Q Q, Namadzi Stream, 30 miles south-east of Hargreaves, 



14. ix. 1910 ; 1(J,1Q, near Petauke, 2,400 ft., 18-20. ix. 1910 ; 1 Q, Msoro, 

 Petauke — Fort Jameson Road, 24. ix. 1910; 1 c?, 25 miles west of Fort 

 Jameson, 25. ix. 1910. 



Besides the foregoing specimens all of which were collected by Mr. S. A. Neave, 

 and presented to the British Museum (Natural History) by the Entomological 

 Research Committee, no fewer than three hundred and forty other examples of 

 Silvius fallax, including sixty - three males and two hundred and seventy- 

 seven Q Q were obtained by Mr. Neave in the Lower Luangwa Valley, from 

 Hargreaves to the Lutembwe River (fifteen miles west of Fort Jameson), 

 between September 14 and 26, 1910. 



Silvius decipiens, Lw., to which reference was made at the commencement of 

 the diagnosis of S. fallax, is apparently found to the south of the area occupied 

 by the latter. Originally described from specimens from " Caffraria," Silviiis 

 decipiens is represented in the National Collection by ten Q Q from the Tamulakan 



