Thelyphonidas in the British Museum. 125 



Thelyphonus anthracinus, sp. n. 



This species is nearly allied to Th. Hosei. It differs in 

 the following respects : — 



The length of apparently an adult female is only 29 millim. 



The lower surface of the abdomen is densely-covered with 

 minute punctuation, which is particularly thick upon the 

 first, second, third, and eighth sternal plates ; on the inter- 

 vening plates the punctuation can be perceived with a lens of 

 low power. 



In Hosei there is no perceptible fine punctulation on the 

 sterna. 



In the tarsi of the first pair of legs the third segment is as 

 long as the second and a trifle longer than the fourth ; the 

 ninth is about as long as the seventh and eighth taken 

 together, the latter two being unmodified ; the fifth and sixth 

 are slightly modified, the former, which is about as long as 

 the fourth, has its upper surface impressed on its inner side, 

 while the sixth, which is longer than the seventh or eighth 

 and about as long as the second, has its inner surface black 

 and flattened and its lower inflated. 



In other respects, such as structure of the chelse &c, this 

 form does not seem to differ from Hosei. The smoother 

 tracts on the interocular area of the carapace in the latter 

 species are not noticeable in anthracinus. 



Loc. Batu Song (Eastern Sarawak). Collected by C. 

 Hose, Esq. 



Thelyphonus Tarnanii, sp. n. (PI. II. figs. 2-2/;.) 



$ . Closely allied to Th. Hosei, but differing in the fol- 

 lowing features : — 



Carapace more finely granular behind, and not granular 

 but coarsely and finely punctured in front, with the ocular 

 tubercle much lower on its anterior portion. 



The posterior prolongation of the genital operculum more 

 rounded. 



The ommatoids are much less clearly discernible j but this 

 is perhaps due to accident or the different method of preser- 

 vation. 



The coxal apophysis of the chela is much less squarely 

 shouldered on its inner border. The segments of the le°-s 

 are relatively shorter (cf. measurements as compared with 

 length of carapace) . The tarsi of the first pair are modified 

 almost exactly as in Hosei, but the relative length of the 

 segments is a little different, the eighth segment being 

 noticeably shorter than the seventh. 



