140 Annals of the South African Museum. 



upper edges of the fifth segment, (4) the relative width of the tibia 

 and hand of the pedipalp in the adults of both sexes, (5) the shape 

 of the tibia of the pedipalp, (6) the form of the posterior upper edge 

 and of the infero-lateral keels of the second and third segments, 

 (7) the size of the vesicle, &c. Slightly more variable but not un- 

 important characters are the relative width of the caudal segments, 

 the duplication of the superior crests in segment 4, the form of the 

 basal lamella of the scape of the pectines in the ? , &c. The form 

 of the shagreened area on the second caudal segment, the number 

 of the flanking teeth on the fingers of the pedipalps, the colouration, 

 and a few other characters, may vary considerably in the same 

 species according to the locality of the specimens. 



Sexual Differences. — The S , even while young, is easily distinguish- 

 able from the ? owing to the presence of a pair of little chitinous 

 stylets, which are situated in the posterior region of the genital 

 orifice and become visible on lifting the halves of the operculum. 

 In the ? the operculum is also divided into two halves, but there 

 are no stylets. Besides this there are other sexual differences, 

 notably in the structure of the pectines. In the ? the basal lamella 

 of the scape bears one or no teeth on its posterior side, which is 

 nearly always produced into a large, broad, obtuse lobe. In the <? 

 the scape is generally angular and only slightly, if at all, produced 

 at the base behind and toothed almost throughout its length, the 

 basal lamella mostly bearing 2 or 3, rarely only 1 tooth on its hind 

 margin. The basal lamella is, however, produced in the $ of calvus 

 and not produced in the 2 of granulat^is. Sometimes also the 

 proximal tooth of the pectines is reduced in size in the ? . The 

 number of the teeth generally runs higher in the males than in 

 the females. In the adult <? also the hand and to a lesser degree 

 the tibia of the pedipalp is generally stouter, the fingers are rela- 

 tively shorter, and the granulation of the tergites and cephalothorax 

 is sometimes more pronounced than in the $ . In all stages pre- 

 ceding the adult form the hand and fingers of the ^ nearly resemble 

 those of the ? in their proportions. I have been unable to detect 

 any differences in the tail between the ^ and ? which may with 

 certainty be regarded as sexual characters. 



Distribution. — The narrow strip of rainy country along the south 

 coast is inhabited by a single species, capensis, which is, however, 

 very abundant and extends from the Divs. of Tulbagh, Worcester, 

 and Caledon in the west, eastwards at least as far as the Divs. of 

 Port Elizabeth and Albany. Northwards the species extends for a 

 short distance into the lower parts of the Karroo, where it mingles 



