Annals of the Transvaal Museum. 
147 
Tergites of abdomen very finely granular anteriorly, posteriorly much 
coarser but not very coarse : on the last tergite the granulation is very fine 
over the whole length of the median area. 
Sternites : first four finely granular at the sides but smooth in the 
middle : last sternite practically smooth in the middle, with only two 
distinct keels (the median pair being practically obsolete) which are faintly 
crenated. 
Tail. The upper surface of first and second caudal segments projects 
step-like in front and then suddenly descends perpendicularly at the 
anterior margin of the stridulating area. The large stridulating area of 
the first segment occupies a shallow concavity and is composed of very 
fine granules which anteriorly and laterally are distinct but posteriorly 
and along the whole length of the area in the middle are fused to form 
very fine wavy transverse ridges which are interrupted or more or less 
continuous. In the second segment the ridges are very much stronger 
and much fewer and are confined to a long narrow median groove : a few 
of them are quite continuous and uninterrupted across the breadth of the 
area but the majority only reach about half way across or less. Segments 
1-4 each with 10 keels, the granules of which are smaller and more 
numerous than those of ftavidus or mosambicensis. The median ventral 
keels of segment 1 are quite smooth : in segments 2 and 3 they are 
granular, more strongly so in the posterior half • in segment 4 they come 
to an end at some distance from the posterior end of the segment. Median 
lateral keel of segment 4 very weak but more or less distinct. Superior 
keel in segment 3 strong in its posterior half but rather weak in segment 
4 : in segment 5 distinct in the anterior third and represented in the 
posterior third of the segment by a few weak granules which are a little 
larger than the adjacent granules on the sides of the segment ; the 
granulation of the sides of this segment is moderately fine but includes 
some coarse granules : dorsal accessory crest very indistinct, represented 
by one or two low granules more or less enlarged. Fourth caudal segment 
very slightly narrower than the first. Caudal segments 1-3 sparsely and 
finely granular laterally and ventrally, the ventral surface of segment 1 
only very finely so, ventral and lateral surfaces of segments 4 and 5 with 
coarser granulation which is moderately dense. 
Hand of pedipalp stout and rounded, considerably wider than the 
tibia, the movable finger only about 1J times the length of the hand back. 
Pectines with 41 teeth, 3 of which are attached to the basal lamella 
which is angular behind. 
Vesicle sparsely but coarsely granular below, above very deeply 
excavated at the base, the two sides of the excavation forming an acute 
angle anteriorly. 
Measurements in millimetres. Total length 74, length of carapace 
8*25, of 5th caudal segment 8 ‘75, of 2nd caudal segment 7. Breadth of 
second caudal segment 5. 
Remarks. One of the most striking features of this species is the 
very deep excavation at the base of the vesicle : something similar thereto 
occurs in P. flavidus, Poc., but is not greatly pronounced in that species. 
It seems to differ from P. trucalentus , 'Hirst, in the character of the 
stridulatory areas of the first two caudal segments, and in the granulation 
of the surfaces of body and tail (ocular tubercle, 3rd, 4th, and 5th caudal 
segments). 
Uroplectes car hiatus , Poc. var. nov. gracilior. 
This form is closely related to the variety described by Dr. Purcell unde r 
the name of U. karrooicus (Ann. S. Afr. Mus. II, p. 182) but differs in the 
