110 
Transactions of the Royal Society of South Africa. 
and forming a shagreen. These ridged granules only occur over a distance 
equal to about i of the total length between the posterior margin of the 
segment and the anterior transverse ridge which marks off the articulating 
surface. 
The first four sternites of the abdomen are all quite smooth except near 
the lateral borders, where they are finely granulated. The granulation of 
the fifth sternite is not coarse, and the space between the median keels is 
free of granules. The four keels are very weakly developed, the median 
ones being quite smooth and the lateral ones granulated. 
Tail. — The stridulatory area of the first segment is broadly and fairly 
deeply excavated, but there is no narrow median groove. The shagreen is 
coarse and consists of short transversely ridged granules : none of these 
transverse ridges are continuous across the breadth of the area ; a transverse 
line across the area in the narrowest part would include at least 5 such 
ridges. Anteriorly, the upper and descending surfaces merge fairly gradually 
into each other, and the angle formed by the stridulatory area with the 
descending portion of the dorsal surface is about 120°. 
The finely granulated area on the upper surface of the third segment 
mesially extends practically the whole length of the segment. In the second 
segment the stridulatory area is similar, the ridges being a little stronger 
and somewhat fewer than in the first segment. None of the ridges are 
continuous across the area, and in the narrowest part there are about 4 or 
5 ridges in a transverse line. As in the first segment, the ridges are stronger 
in the posterior half of the segment than anteriorly. Intercarinal spaces 
of first segment granular at the sides of the segment, but ventrally they are 
almost quite free of granules. Segments I-IY with 10 granular keels each : 
all the median ventral keels are granular throughout, but those of the fourth 
segment are only distinct as keels in the first half or two-thirds of the seg- 
ment. Superior keels of third and fourth segments fairly strong throughout 
their length, of fifth segment quite strong posteriorly as well as anteriorlv, 
but interrupted in the middle : accessory crest of fifth segment superiorly 
represented by 3 or 4 coarse granules irregularly disposed. Sides of seg- 
ment V granulated fairly coarsely. Fourth segment a trifle broader than 
first segment. 
Hand not very stout, as wide as the brachium in its widest part : movable 
finger a trifle more than twice the length of the hand-back. 
Pectines. — There is a large rounded basal lobe, and in addition the 
lamella carries 30 teeth. 
Vesicle fairly large, with an excavation at the base superiorly, but this is 
not so deep nor so sharply defined as in stridulus mihi. 
Colour. — Yellow throughout except the vesicle, which is brown, and the 
ocular tubercle, w^hich is also ])rown : the tergites are pale brownish. 
Measurements. — Total length 97 mm., length of carapace lO'S mm., breadth 
