434 MR. K. I. POCOCK ON SOME OLD-WOELD 



tionably referable to I. tricarinatus of Siniou. Mons. Simon had 

 only a female for examination, and since one of the specimens in 

 the Museum collection is a male, I take this opportunity of 

 pointing out the sexual characters of the species. 



$ , Tail much shorter, only a little more than fiye times the 

 length of the cephalothorax ; the first segment about as wide as 

 long ; cephalothorax about as long as the first segment and 

 half the second, slightly longer than the fourth. 



Manua about as wide as the brachium ; digits in contact 

 throughout, neither lobate nor sinuate. 



c? . Tail much longer, about six times the length of the cepha- 

 lothorax ; width of the first segment equal to about two thirds 

 of its length ; cephalothorax very slightly longer than the first 

 caudal segment, much shorter than the fourth. 



Manus wider than the brachinm ; digits not quite in contact 

 at the base, the movable furnished with a distinct lobe which fits 

 into a sinuation of the immovable. 



I. Shoplandii, Oates, is very closely allied to this form and can, 

 I think, only be regarded as doubtfully distinct. In his descrip- 

 tion of this species Mr. Oates, to whom I. tricarinatus was 

 unknown, lays considerable stress on the diiferences of colour 

 between the two ; but the words " the whole animal uniform ful- 

 vous" with which he difi'erentiates I. tricarinatus, are scarcely in 

 accord with the follovving sentence with which Mons. Simon's 

 description begins, " Ohscicre fulvus, pedibus dilutiorihus, caudoG 

 segment quinto leniter infra infuscato''' As a matter of fact, 

 there is very little difference in colour between the two, what dif- 

 ference there is being noticeable principally on the under surface 

 of the tail, which is more infuscate in J. Shoplandii. The upper 

 surface of the abdomen in at least one of the specimens of I. tri- 

 carinatus is considerably darker than the limbs, and the tergites 

 bear distinct traces of the fulvous >- shaped mark which is notice- 

 able in the specimen of I. Shoplandii which Mr. Oates has kindly 

 presented to the Museum. Apart, however, from colour, certain 

 diflFerences are undoubtedly to be seen between this specimen of 

 I. Shoplandii and the three above-mentioned examples of I. tri- 

 carinatus. Thus, in the former the cephalothorax is slightly more 

 emarginate in front and the anteocular area is more coarsely 

 granular ; again, the lateral tergal keels are represented only by 

 one conspicuous granule, whereas in I. tricarinatus these keels 

 are composed of about three fused granules ; and, lastly, the tail 



