24 Annals of the South African Museum. 



occupying | J ^ tne length of the segment ; patella with a superior 

 distal patch of stoutish or slender, sharp spinules, in addition to the 

 short stout spines along the anterior surface ; metatarsus with an 

 inferior apical tuft composed of 3-11 irregularly arranged, unequal 

 spines and some spiniform bristles. Fourth leg with a number of 

 spines on the anterior surface of the 3 distal segments ; the basal 

 atch of red spinules on the patella very large, reaching to the distal 

 fifth or sixth of the segment on the anterior surface ; infero-posterior 

 apical tuft on metatarsus formed of a single, long, stout spine, 

 usually flanked by 1-3 slenderer spines or spiniform setae, the under 

 surface sometimes also with a stout spine remote from the apex. 



Labium with 5-8 apical teeth. 



Measurements of largest ? .Total length 38 mm. ; length of 

 carapace 121, width 10J ; length of metatarsus of first leg 4f ; width 

 of ocular area 3f . 



This species is closely allied to S. oculatus, Pocock (P.Z.S., 1897, 

 p. 728), from Bloemfontein. 



Nests. The nests with the surrounding earth of 2 of the younger 

 specimens and of 1 of the typical females and the lid of another of 

 the typical females were sent to me by Mr. Schreiner. Their 

 dimensions in mm. are as follows : 



No. 9561. No. 9560. No. 9523. No. 9579. 

 Width of lid taken parallel 



to hinge 6i IQi 19 23J 



Width of lid taken at right 



angles to hinge 5f 9f 17 22 



Width of hinge 2J ? 8 11 



Width of hole at 10 mm. 



from edge 5 15 \ 



Average thickness of lid 



about 2i 3i 5f 4 



Length of occupant llf 17 24 29 



Width of carapace 2| 4i 7 8J 



These nests closely resemble those of S. schreineri described above 

 but there are some differences in the structure of the lids by which 

 they may be easily distinguished. 



The lids of unispinosus (pi. I., figs. 1-2) are relatively much 

 thicker (cf. measurements), the edges less bevelled, the peripheral 

 surface appearing much less wedge-shaped, when seen from the side, 

 and passing over at the more angular lower edge rather suddenly 

 into the flattened under surface. This is particularly marked in the 



