374 Records of the Indian Museum. [VOLS wv ime 
The toothed-plate is invariably shorter than the segment itself ; 
an average of 8 measurements gave the relative proportions of 
segment and ‘“‘ reibleiste’’ as 27°5: 24°5, whereas in P. securifer, 
Giesbrecht figures the reibleiste as much longer than the segment, 
and in my specimens the average was 20: 24. ‘The distal segment 
of the knee-joint bears two toothed-plates, the proximal being the 
smaller and having from 8 to II arrow-shaped teeth. These two 
segments appear to vary very considerably in their relative pro- 
portions; in some the proximal is the longer, while in others it is 
very distinctly shorter than the distal joint. Below I give the 
measurements in ten different individuals :— 
(1) 22:21 | (6) 21:19 
(2) 23:21 | (7) 20321 
(3) 21: 21°5 | (8) 20: 21°5 
(4) 223 21°5 | (9) 24:22 
(5) 22:22 | (10) 22: 22. 
From the above it will be noted that it is in the smaller 
specimens, with a measurement of 20 or 21 for the proximal joint, 
that the distal exceeds the proximal in length, the condition 
becoming reversed in the larger specimens. 
It appears possible that we are here dealing with a depau- 
perized condition, the small size of the animal and the alteration 
in the proportions of the segments forming the knee-joint being 
correlated with one another. In any case, the relative proportions 
of these joints, in the absence of any other measurements, would 
seem to be of doubtful specific value. 
It is in the 5th pair of legs that these males present their 
greatest difference from P. secuvifey. The proximal segment of 
the claw has a well-marked simple process proximally and bears 
on its margin three teeth; the first is stout and triangular in 
shape, the other two are thin and more delicate and are respectively 
rounded and ‘sharply pointed; between these two latter a single 
seta arises. The distal segment also bears on its margin three 
rounded teeth. The left leg has a short terminal joint, bearing a 
stout curved spine and two more delicate processes at its distal 
extremity and a short spine on its external border, and the inner 
surface is covered with hair. The penultimate joint has-a short 
spine at its distal external border. 
As I have shown (vide P. securifer, above), the male described 
by Wolfenden as the male of P. sfimtpes is in all probability 
merely a variation of the male of P. securifer, and not the hitherto- 
unknown male of P. spinipes. The above males are unlike any- 
thing previously described, though fairly closely resembling 
P. securifey in certain respects; they were associated in all the 
catches with undoubted females of P. spinifes and are, in mv 
opinion, the hitherto-unknown male. 
