418 Mr. R. I. Pocock on some 



hand of medium width, its width less than length of hand- 

 back and of movable digit, furnished with only five crests, 

 the middle of the three crests which normally run from the 

 immovable digit, as well as the median crest on the outer 

 half of the upper surface of the hand, obsolete ; the two 

 internal (anterior) crests of the upper surface very weakly 

 granular, the external crest of the upper surface quite smooth; 

 the inner surface of the hand with a few granules near the 

 base of the fingers ; for the rest the spaces between the keels 

 are quite smooth ; movable digit longer than the hand-back 

 and just about equal to the length of the carapace, with about 

 eight rows of teeth. 



Pectinal teeth 4. 



Measurements in millimetres. — Total length 41 ; length of 

 carapace 6, of tail 22 ; width of hand 4*2 ; length of hand- 

 back 5, of movable digit 6. 



Loc. Pulo Gaya, British North Borneo (S. 8. Flower). 



Most nearly related apparently to C. celebensis, Pocock 

 (Max Weber's Zool. Ergebnisse etc. ii. p. 93, 1893), from 

 Celebes; but certainly differing in the following particulars : — 

 In celebensis the ocular tubercle is prolonged anteriorly; the 

 upperside of the tail between the crests is granular; the 

 normal keels on the hand are more strongly pronounced and 

 more granular; the base of the immovable digit and the 

 adjacent area of the hand is strongly granular. 



Chcerilus rectimanus, sp. n. 



? . — In size and colour much resembling C. celebensis, but 

 easily recognizable by the form of the hand. In celebensis 

 the hand is shorter, the inner edge is distinctly granular and 

 convexly rounded, and the median keel on the upper surface 

 is obsolete, while the remaining two keels are strong, the 

 area between them being nearly flat ; the movable digit is 

 about as long as the hand- back. In rectimanus, on the 

 contrary, the hand is longer, its inner edge is very weakly 

 granular, straight, and parallel with the outer edge ; the 

 median crest on the upper surface is as strong as the others, 

 although all are weak ; the movable digit is shorter than 

 the length of the hand-back, which far exceeds the width 

 of the hand. The caudal crests in rectimanus are also stronger 

 and more strongly granular than in celebensis. 



<$ . — With much longer chelae than the female ; width of 

 the hand about half the length of the hand-back, length of 

 hand-back exceeding that of carapace ; brachium also longer 

 than carapace. In the female the brachium is shorter than 

 the carapace. 



