436 MR. K. I. POCOCK ON SOME OI/D-WOBLD 



Karsch, a si^ecies recorded from the same locality. Consequently 

 Phipsoni is synonymous wifcli Weberi. Moreover, after carefully 

 comparing Mr. Oates's specimens with the description of J. messor, 

 Simon, I cannot find a single character to justify the specific 

 separation of the specimens named Fhijpsoni from those named 

 messor. 



I believe, therefore, that the above synonymy is correct. If so, 

 the species has a fairly wide range, occurring in Tenasserim, the 

 Malay Peninsula, and Java, and, according to Thorell, as far to 

 the east as Keeling Island. 



ISOMETEUS HosEi, sp. n. (PI. XI. fig. 2.) 

 Colour: upper surface of trunk, tail, and appendages dull 

 black, the hands, tarsal segments of legs, and vesicle with tinge 

 of red ; upper surface of chelicerae shining ; pectines ochraceous ; 

 abdominal sternites and under surface of appendages with red- 

 dish tint. 



Ceplialothoraco finely and closely granular throughout ; anterior 

 border widely and shallowly emarginate ; ocular 'tubercle deeply 

 and widely sulcate, the median eyes large and separated by a 

 space equal to about half a diameter ; no trace of keels running 

 from the tubercle to the anterior margin, and the posterior keels 

 which bound laterally and posteriorly the central cephalothoracic 

 depression only very slightly developed. 



Tergites finely granular throughout ; the first six marked pos- 

 teriorly with a median granular keel, the seventh marked with a 

 short, anterior, median, granular keel and on each side with two 

 slightly oblique granular keels which run from the hinder margin 

 of the tergite to the middle of the plate, but do ijot unite in 

 front ; the third, fourth, fifth, and sixth tergites furnished pos- 

 teriorly on each side of the middle with a conspicuous transverse 

 ridge formed by an aggregation of coarser granules. 



Sternites : four anterior bisulcate and almost wholly smooth, 

 feebly granular only on the side margins ; the fifth very feebly 

 granular and armed with four granular keels, of which the two 

 internal attain the hinder margin of the plate, while the external 

 are situated in the middle with their extremities far from the 

 anterior and posterior margins. 



Tail somewhat slender, a little thicker at the base than at the 

 apex ; the intercarinal spaces almost wholly smooth, at most very 

 feebly granular, the keels strongly marked but weakly granular ; 



