430 Annals of tJw South African Museum. 



large, the second and third small, the fourth strong and curved, 

 closing down just in front of the first tooth of the lower jaw ; then 

 follows a series of 3-5 small teeth and finally another strong tooth, 

 which terminates the single series ; the first tooth of the single 

 series is always larger than the other small teeth, but smaller than 

 the two large teeth. Terminal fang strong, curved downwards and 

 outwards at the apex, the upper surface sulcate, being furnished 

 on the inner edge with an upright smooth keel, which becomes very 

 low anteriorly and terminates in a tiny angle or tooth at the com- 

 mencement of the apical curve (fig. 28). The under side of the 

 upper jaw is perfectly straight, and there is no flexure except at the 

 tip. Lower jaw with two large teeth and a small one between them 

 just in front of the hind tooth but remote from the anterior one ; the 

 upper surface of jaw not sulcate laterally, its outer edge somewhat 

 angular but not carinate on the lateral side of the teeth. 



Colour. Yellow, two longitudinal stripes on the thorax and 

 abdomen, four on the head-plate, and two on each of the mandibles 

 infuscate or black ; the upper surface of all of the limbs blackened or 

 dark brown, or the anterior limbs not infuscate. Pubescence of a 

 beautiful silvery white colour, the long hairs on the head-plate and 

 mandibles and many of those on the palps brown. Hairs on the 

 sides of the abdomen long and silvery white. Hind legs with the 

 tibia and metatarsus thickly covered above with enormously long 

 silvery hairs, far exceeding the metatarsus in length, the hairs on 

 the lower side of these joints and on the femora shorter, forming 

 a delicate mane. 



Dentition in young. Upper jaw with the first tooth large, followed 

 by one or two small ones, then another large one, followed by 4 

 small ones, after which comes the large last tooth of the single 

 series. Lower jaw with one small tooth between the two large 

 ones, which are closer together than in the ad. $ . 



Measurements of ad. $ and immature specimen from Ookiep. 

 Total length $ 32, juv. 25 ; length of head-plate $ 5, juv. 3^, width 

 $ 6J, juv. 4; length of mandible 3 11, juv. 7|, width $ 3-J, juv. 

 2-^-; length of flagellum 4f ; length of palp $ 16^, juv. llf, tibia 

 3 5^, juv. 3^, metatarsus + tarsus 3 6f , juv. 4f ; length of III. 

 leg 3 20, juv. 14i ; length of IV. leg 3 33i, juv. 211, tibia 3 6, 

 juv. 4, metatarsus 3 6i, juv. 4-!-. 



Localities. (a) 4 ad. 3 aud 1 juv. (all dried) from Ookiep, 

 Namaqualand Div. (L. Peringue//, 1885). In these specimens the 

 palps have no black stripes and the two infuscate stripes on the 

 mandibles do not unite anteriorly. 



