14 E. W. Gates — On tlie Species a/ Tliolyphonus mJmhiting [JTo. 1, 



Structure, c? . Second joint of clieliceres punctured all over, granu- 

 lated and wrinkled at the anterior lateral corner, teeth on the interior 

 and anterior mai'gins indistinct, very variable in number and in all cases 

 small and obsolete, no distinct spine below. Third joint punctured all 

 over and coa'-sely granulated on the inner edge, with a spine below. 

 Fourth joint with very few punctures, nearly smooth, apophysis long 

 and cylindrical, terminated with two blunt teeth and with a large 

 rounded process interiorly near the end (Fig. 7). Fifth joint very large 

 and round, very nearly smooth, fixed finger short, triangular with a 

 broad base, serrated on both edges, movable finger rather shorter than 

 the fifth joint, serrated and sinuated within (Fig. 5). First joint beneath 

 very sparingly punctured. 



Cephalothorax granulated all over and transversely wrinkled behind 

 the central eyes. 



First lower abdominal segment smooth in the middle, not divided 

 longitudinally by a groove. 



Structure, ? . The upper surface of cheliceres sparingly punctured 

 throughout, 2nd joint with five very distinct teeth on the front and 

 lateral edges, of which the two on the front edge are the largest, two 

 teeth on the lower surface ; third joint with a tooth on the interior edge 

 and one below ; fourth joint with a tooth below, the apophysis trian- 

 gular, finely serrated on the outer edge, with two or three teeth on the 

 inner (Fig. 8). Fifth joint narrower than the fourth, fixed finger sharply 

 triangular, serrated on the outer edge, also on the inner edge nearly 

 down to the bottom of the joint ; movable finger shorter than fifth 

 joint, gently curved throughout and serrated interiorly. 



Cephalothorax and other parts, as in the male, except the first lower 

 abdominal segment, which is pointed posteriorly. 



This species is remarkable for the huge cheliceres of the adult male. 

 It is common on Double Island at the entrance of the Moulmaiu River, 

 to which island it appears to be confined, for on the opposite coast of the 

 mainland P. formosus only is found. This island, which is crowned by a 

 lighthouse, is very rocky, and only a few acres in extent. Some soft soil 

 is found here and there under the rocks and under the bricks used for 

 the staircase up to the summit of the island, and under these this animal 

 occurs in incredible numbers. 



7, THELYPHON0S FORMOSUS, 



Vheli/phomis formosus, Butler, Ann. and Mag. Nat. Hist, sor iv, vol. x, p. 201, 

 pt. xiii, f. H, 



), „ Stoliczka, J. A. S. B. 1873, p. 137, pt. xii, f. 4. 



d". Cheliceres shiny-black; cephalothorax black slightly tinged 



