Annals of the Transvaal Museum 
ioi 
Vryburg and Wolmaranstad form will prove to be distinct from the type as* 
described by Dr Purcell from the Motopo dist., for minor differences seem to be 
presented in the proportions of the tibia and metatarsus of the first leg. 
Nest. The females of nigrofulvus were found by Mr Roberts in tubular 
retreats provided with a well-developed trap-door. The door is very large but 
thin, becoming very delicate and flexible at the margin which presumably 
overlaps the entrance to the retreat: the shape is subcircular or more or less 
D-shaped. The area of a large specimen is about equal to that of a five-shilling 
piece. 
Idiothele pluridentatum sp. nov. (text fig. 12 b). 
The type of this species is a single female specimen from Nuanetsi River, 
Zoutpansberg dist., collected by Mr G. van Dam, 15. vii. 1916. 
Text fig. 12. Outer surface of right chelicera of {a) Idiothele nigrofulvus { Poc.), ( b ) Idio- 
thele pluridentatum sp. nov. to indicate the position of the scopulae and stridulatory 
bristles in each. (These bristles are represented as stouter than they actually are : 
they are very similar to the long red bristles which fringe the inferior margin of 
the chelicera.) 
It differs from I. nigrofulvus in the following respects : 
Ventral surfaces paler, the abdomen being devoid of infuscation inferiorly, 
and the coxae are only slightly infuscated, whilst the sternum is dark brown 
instead of black. 
Carapace as long as the metatarsus and tarsus of the fourth leg. 
The long stridulatory bristles on the chelicerae are rather more strongly 
developed, an upper series, well removed from the bristles which fringe the 
fang groove, being present. The cusps on the maxilla at its antero-basal 
corner inferiorly, are more numerous and much more compactly disposed, 
the whole group including rather more than a hundred cusps. 
The radial markings on the carapace are not so strongly defined as there 
is not much differentiation between pale hairs and dark hairs, the carapace 
being mostly clothed with pale hairs although dark hairs do occur : these hairs 
are longer than those on the carapace of nigrofulvus and the surface has a more 
shaggy appearance. The ocular tubercle is rather less than half its length 
distant from the front margin of the carapace. 
Measurements. Total length 32, length of carapace ii-6, breadth of cara- 
