South African Arachnida. 223 



Pediijalps. — Metatarsus with numerous long hairs and short 

 truncated cylindrical ones along its whole length. 



Locality. — One S^ found by Mr. M. Schlechter near the Orange 

 Eiver, between Bysteek and the Great Falls at Aughrabies, Kenhart 

 Div., Cape Cotony. Total length 11 J mm. 



Eesembling H. nigrohmatus Krpln. in the dark colouration, 

 but the structure of the lower finger of the cheliceras is quite 

 different. 



Gen. CHELYPUS, nov. 



The S' differs from that of Hexisojpus ~^' principally as follows : — 

 Fourth leg with the 3 distal segments extremely broad (the 2 distal 

 ones broader than long), bluntly angular along the outer edges ; the 

 metatarsus broader than the tibia, subequalling the latter in length 

 along the outer inferior edge and longer than the tarsus, its distal 

 part strongly compressed from below; the tarsus very strongly 

 flattened from below and above, almost discoid in shape, with a very 

 narrow outer side bearing a row of 5-6 short, broad, blunt spines ; 

 inferior surface of the 5 distal segments, as well as the external 

 surface of the tibia and metatarsus, hairless but densely covered 

 with extremely abbreviated, dentiform or granuliform spinules, the 

 hind margin of the 2 femoral segments with longer spines. Third 

 leg with the tibia and the distal segment of femur triquetrous, their 

 posterior surface flattened, hairless and densely covered with strongly 

 abbreviated spinules similar to those on the fourth leg, those along 

 the upper and lower edges longer, particularly on the tibia, the tibia 

 strongly dilated below, its thickness (measured dorso-ventrally) 

 much greater than that of the distal femoral segment. Clatos of 

 second and third legs composed almost entirely of the distal 

 segment, the proximal segment extremely short and indistinctly 

 marked off. Distal segments of pedipali^s strongly spined. ChelicercB 

 without stridulating ribs on the inner surface, which is furnished 

 instead with a large smooth area marked with some fine and quite 



* Kraepelin's nomenclature for the segments of the legs (Das Tierr., Palp. & 

 Sol., p. 7, fig. 8) is preferable to that previously used by me (Ann. S. A. Mus., 

 vol. i. p. 382, fig. 1), and will be adopted here. All the legs in Hexisojms, there- 

 fore, are considered as having only one tarsal joint (not counting the minute 

 apical piece bearing the claws), which is preceded by the metatarsus, the tibia, 

 and the distal and proximal femoral segments. The 4 distal segments are 

 directed forwards in the second and third legs, but backwards in the fourth leg, 

 and the spinous outer surface of these segments correspond, therefore, to the 

 posterior surface in the former legs but to the anterior surface in the latter leg. 



