388 ME. E. I. POCOCK OK THE 



12. Centeueus INSUI.ANUS, Ty^oreZZ. (PI. XXX. figs. 12-12 Z».) 



Centrurus insulanus, Thorell, op. cit. p. 148 ; Kraepelin, op. cit. 

 p. 127. 



Colour pale fuscous above, the tergites adorned with three 

 yellow bands, one median and one on each side ; the upper sur- 

 face of the tail and the lower surface of the trunk and appen- 

 dages pale, but the lower surface of the tail and the external 

 surface of the leg^ iufuscate ; palpi infuscate above, the manus 

 pale internally ; digits iufuscate, with flavous tips. 



$ . Trunk closely but nut strongly granular above ; smooth 

 beneath and punctured, the third sternite being especially 

 coarsely punctured in the middle of the hinder half. Tail about 

 5| times the length of the carapace, slightly narrowed poste- 

 riorly ; the keels finely granular, the inferior ones stronger than 

 the superior, the first four segments not twice as long as wide, 

 the fifth just about twice as long as wide, its superior edges 

 rounded ; the intercarinal spaces very finely granular ; vesicle 

 ovate, with a minute tubercle beneath the aculeus but at some 

 distance from its base. 



Falpi moderate ; manus a little wider than the brachiura ; the 

 length of the "hand-back" more than half the length of the 

 movable digit, the middle series of denticles on the digits con- 

 sisting o£ 8 rows. 



Pectines short, containing about 20 teeth. 



Length 66 mm., of carapace 6"3, of tail 37 ; width of 1st 

 segment 3"3, length 4*2 ; width of 5th 3, length 7. 



Adult d. Longer and slenderer than female; the tail about 

 62 times the length of the carapace and parallel-sided, the seg- 

 ments, with the exception of the 1st, more than twice as long as 

 wide. 



Falpi slightly longer than in the female. 



Length 71'5 mm., of carapace 7, of tail 4!7'5. 



Locality/. Jamaica; also, according to specimens in the British 

 Museum, from Choco and Brazil. 



The Museum has received many examples of this species from 

 Mr. a. W. Peckham and Mr. T. D. A. Cockerell. 



This species may be at once recognized from the preceding 

 two by its finer granulation, difterence in colour, absence of 

 a spine beneath the aculeus, smaller number of pectinal 

 teeth, &c. 



