326 Mr. R. I. Pocock on 



Eyes of anterior line subeqiial, the medians about three 

 diameters apart and one diameter from the posterior medians, 

 tlie latter twice the diameter of the anterior medians and 

 rather more than three diameters apart and a little more than 

 that from the posterior laterals ; the median quadrangle twice 

 as wide behind as its anterior width and about as long as its 

 anterior width ; distance between anterior lateral and anterior 

 median eye on each side equal to three times the distance 

 between the two medians. 



AhcJomen lightly expanding towards its middle, about twice 

 as long as wide; its upper surface just behind the middle 

 prolonged into a long conical process, which, when distended, 

 is as long as the carapace or at least three quarters the length 

 of the abdomen. 



Vulva, consisting of a simple horny triangular plate, with 

 transverse posterior border, the apertures of the receptacula 

 seminis on its posterior portion within the epigastric fold. 



Mandibles powerful, armed with four anterior and five 

 posterior teeth. 



Measurements in millimetres. — Total length 11 ; carapace 5 ; 

 height of abdomen 8 ; length of first leg 33, fourth 16. 



Loc. Durban {O. P. Siauntoti). 



This is the second record of the genus Menneus from 

 Africa. The only other species known from this country, 

 M. tetragnathoides, Simon (Bull. Soc. Zool. Fr. i. p. 218, 

 1876), was based upon a male from the Congo, which 

 certainly differs from M. camelus in having the anterior 

 median eyes and also the posterior median eyes about a 

 diameter apart. The abdomen, too, is described as narrow, 

 elongate, and parallel-sided. 



Fam. Argiopidae. 

 Genus C^ROSTRis, Thor. 

 Ccerostris corticosa, sp. n. 



? . — Closely resembling C. sewcuspidata, Fabr., in colour 

 and general characters, but with the ventral surface of the 

 abdomen dead black, no bitubercular prominence above the 

 spinning-mamillre, and the fringe on the posterior side of the 

 femur of the fourth leg formed of slender undifferentiated 

 hairs. 



Vulva very different, the two processes long, slender, sub- 

 membranous, separated by a space equalling the length of 

 either, the area between them deeply grooved longitudinally ; 

 the two fossae looking obliquely inwards and backwards, with 



