404 Annals of the Soutli African Museum. 



b 6 . Anterior tergal plates ferruginous-brown in the middle and 

 blackened laterally, the posterior ones entirely ferruginous-black, 

 the hairs on the sides of abdomen yellowish white, those bordering 

 the tergal plates bright yellow vincta, Koch. (p. 420) 



65. Hind legs with a distinct mane on upper side . . rillosa, n. sp. (p. 422) 



GROUP III. Upper jaw of mandibles with the distal series composed of 7-10 

 teeth. 



a?. Head-plate with 4, mandibles each with 2 dark stripes above. 



lineata, Koch. (p. 428) 



6". Head-plate uniformly yellow brevipalpus, n. sp. (p. 431) 



GROUP IV. Upper jaw with the anterior tooth far remo% 7 ed from the second 

 tooth, as well as remote from the apex of the jaw 



nigro-braccata, n. sp. (p. 431) 



I. -The LETHALIS Group. 



l>en tit inn i if upper jaw subs/ in i In r in the tico sexes, the distal or 

 single .srr/V.s > in-posed of 4-5 teeth, which are not separated into groups 

 by one or more long toothless intervals (figs. 16-22a). 



In the first abdominal sternite the posterior median angles of the 

 halves are rectangular or rounded, but not produced in the adult 

 female. In the male the metatarsus of the palp is distinctly scopu- 

 late below for a portion of its length ; the upper margin of the basal 

 enlargement of flagellum is obtuse and rounded, or elevated in the 

 posterior part to form an angular ridge (but rarely forming a high 

 thin keel) ; the terminal fang of the upper jaw is not elevated along 

 the inner edge of the upper side to form a groove for the reception of 

 the flagellum, although often slightly dilated inwards. Palps exceed- 

 ing, rarely equalling, the III. leg in length. Posterior legs with 

 numerous shorter and a small number of very long hairs, which 

 never form a mane (in scn'cea, Poc., however, the long hairs are very 

 numerous). 



Mostly large or very large species of a yellow colour, the upper 

 surface often blackened, the abdominal terga mostly uniformly 

 coloured. The large forms appear to be nocturnal in their habits, 

 but the small fusca, Koch, and sericea, Poc., which have white silvery 

 hairs on the sides of the abdomen, are diurnal. 



The species which belong here are : 



(a) Species with the hairs on the abdomen uniformly coloured 

 (probably all or nearly all nocturnal) : letlialis, Koch, venator, Poc., 

 scJilechteri, n. sp., sermticornis, n. sp., inonteiroi, Poc., venosa, n. sp., 



