AUTUBOPOD FAU]!fA OF TUE WEST INDIES. 3S9 



13. Centeurus TESTACEtrs (De Geer). (PI. XXX. figs. 11-11 «.) 



Scorpio testaceus, De Geer, Mem. vii. p. 347, pi- 41. fig. 11. 



Centriiriis testaceus, Thorell, op. cit. p. 160 ; Kraepelin, op. cit. p. 130. 

 2 . Colour a uniform testaceous or pale ochraceous throughout, 

 the digits alone and the apex of the aculeus being lightly fuscous ; 

 eyes black. 



Trimk somewhat coarsely granular above ; anterior sternites 

 of the abdomen shining, sparsely punctured, the 3rd not thickly 

 punctured, the 4th coriaceous and subcostate, the 5th very finely 

 granular, the keels well developed. Tail slender, slightly atten- 

 uated posteriorly, about six times the length of the carapace, tlie 

 second segment twice as long as wide, all the intercarinal spaces 

 finely granular, the keels well expressed and granular, the upper 

 edges of the fifth not carinate ; the vesicle almost the same shape 

 as in C. insulanus, hut the aculeus sloped more backwards and the 

 tubercle closer to its base. Palpi almost exactly as in G. insu- 

 lanus, but perhaps rather longer, and with the keels on the manus 

 a little more strongly expressed ; with 8 or 9 rows of denticles 

 along the median series. 



Pectines short, with about 20 teeth. 



S . Slenderer than female ; tail slightly attenuated posteriorly, 

 about eight times the length of the carapace, the second segmemt 

 about three times as long as wide, the vesicle elongate and 

 ovate ; manus a little wider and distinctly longer than in the 

 female. Pectines longer, with about 23 teeth. 



Measurements in millimetres : — ■ 



$ . Total length (33, of carapace 6'3, of tail 37"5 ; width of 1st 

 segment 2-8, length 4-8 ; width of 5th 2"5, length 7. 



cJ. Total length 64, of carapace 5*5, of tail 44 ; length of 1st 

 segment 5, width 23 ; length of 2nd 6-6, width 2-2 ; length of 

 5th 8-8, width 2-2. 



Locality. Moatserrat (West Indies) ; presented by Sir A. 

 Alderley. 



This species has hitherto been known only from the West 

 Indies ; this is, I believe, the first occasion on which a definite 

 locality has been assigned to it. 



This species resembles G. insulanus in possessing only a minute 

 tubercle beneath the aculeus, and in having only about 20 pectinal 

 teeth ; it is, however, more coarsely granular, difi'erently coloured, 

 has a much slenderer tail {cf. measurements), a differently formed 

 vesicle, &c. 



