386 Mr. R. I. Pocock on new 



Genus Centrueus, Hempr. & Ehrenb. 

 Centrums barbudensis, sp. n. 



2. — Colour. Trunk banded as in G. insulanus of Thorell, 

 from Jamaica ; legs, palpi, and lower surface of tail thickly 

 spotted with black. 



Move coarsely granular than insulanus, but with the 

 vesicle neither so wide, so high, nor the aculeus so curved. 

 Hand broader, its width nearly half the length of the movable 

 digit, with its inner surface rather coarsely granular. 



Pectinal teeth 21. 



^ . — More different from the male of insulanus than is the 

 female, the tail being very long, about eight times the length 

 of the carapace, which is shorter than its first segment ; 

 vesicle long and piriform. 



In insulanus the tail is less than seven times the length of 

 the carapace, which is longer than its first segment; the 

 vesicle is subspherical. 



Pectinal teeth 23. 



Measurements in miUimetres, — $ . Total length 59, cara- 

 pace 6, tail 38*5 ; width of hand 3 ; lengtli of movable digit 

 7*5 (in a female of insulanus the digit measures 7"5 and the 

 width of the hand 2'5). ^. Total length 68, of carapace 

 5-5, of tail 47. 



Loc. Barbuda and Bird's Island ( TF. R. Forrest coll.). 



Centrurus ochraceus, sp. n. 



$ . — Colour a uniform ochre-brown on the uppersideof the 

 trunk (the very edges of the tergites alone infuscate) ; palpi 

 and tail a uniform ochre-yellow ; legs paler yellow. 



Trunk less coarsely and less closely granular than in 

 E. margaritatus ; keels on tail and last abdominal sternite as 

 in margaritatus, but less strongly granular, those on the 

 sternite quite smooth ; spine beneath aculeus of vesicle large, 

 broader at base than in margaritatus ; chelee carinate as in 

 the latter ; the external finger-keel complete, but, like the 

 middle finger-keel, smooth ; eight rows of teeth on the 

 movable digit. 



(J . — Differing from the male of margaritatus in the same 

 characters as the female from the female of margaritatus, but 

 further recognizable by the different form of the vesicle, 

 which, when viewed from below, is evenly oval and not 

 broad, and strongly shouldered at the base of the aculeus. 



Pectinal teeth, ? 27 ; J 27-28. 



