390 MR. E. I. POCOCK ON THE 



14. Centruefs nitidus, TTiorell. (PI. XXIX. figs. 5-5 h.) 

 Centrurus nitidus, Thorell, op. cit. p. 152; Kraepelin, op. cit. p. 129. 

 Centrurus tenuis, Thorell, op. cit. p. 153. 

 Centrurus republicanus, Karsch, op. cit. p. 120. 

 Colour testaceous, carapace anteriorly infuscate, a fuscous 

 patch upon each side of the tergites ; tail inferiorlj infuscate 

 towards its distal end ; digits fuscous, with pale tips. 



$ . Trunk above granular, but not closely or coarsely, the 

 posterior keels of the carapace low. Tail parallel-sided, about 

 six times the length of the carapace, shining ; the intercarinal 

 spaces, except posteriorly on the inferior surface, smooth ; the 

 keels granular, except those on the lower surface of the 1st 

 segment, which are almost smooth ; the superior edges of the 

 5th rounded, this segment about twice as long as wide, much 

 wader than the brachiura, almost as wide as the hand ; vesicle 

 smooth, with a minute tubercle close to the base of the aculeus. 

 Palpi moderate ; hands wide, much wider than the brachium, 

 obsoletely costate abore ; the digits short, the back of the hand a 

 little more than two thirds their length. 

 Pectines short, furnished with 17 teeth. 



6 . Tail from 1\ to 8 times the length of the carapace, 

 generally slightly expanded towards its distal end, in one spe- 

 cimen parallel-sided ; the 5th segment usually about two and a 

 half times as long as wdde (in one example more than three times 

 as long as wide), usually considerably wider than the brachium. 

 Measurements in millimetres : — 



$ . Total length 51, of carapace 5, of tail 31 ; length of 5th 

 segment 5*8, width almost 3 ; width of brachium 2, of manus ju-t 

 over 3 ; length of" hand-back " almost 4, of movable digit 5"2. 



S a (largest). Total length 69, of carapace 6, of tail 49 ; width 

 of 1st segment 3, of 5th 3*3, length of latter 8*6 ; width of 

 brachium 2 '5, of manus 3*5 ; length of hand-back 5, of movable 

 digit 6 '5. 



S i. (smaller). Total length 61, of carapace 5, of tail 40 ; width 

 of 1st and 5th segments 2'3, length of latter almost 8 ; width of 

 brachium 2, of manus 2'5. 



Locality. Hayti, whence the British Museum has specimens. 

 It also occurs in Brazil. 



Of the above examples one only is a female. This and three 

 cf the males agree closely with Thorell's description of G. nitidus ; 

 the other male, the one from Keyserliug's collection, is inter- 



