CENTRUROIDES. 



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13. Centruroides bicolor. (Tab. VII. figg. 5, 5 a, s .) 



Centrums bicolor, Pocock, Ann. & Mag. Nat. Hist. (7) i. p. 388 (1898) l j Kraepelin, Das Tierr., 



Scorpiones et Pedipalpi, p. 93 (1899) 2 . 



Colour alike in the two sexes ; carapace and upperside of abdomen mostly black, yellowish-brown in parts, the 

 last tergite yellowish-brown with black keels ; sterna yellowish-brown, blackish on the margins (and in 

 the middle in the female) ; tail darkening posteriorly, its first four segments deep ochre-yellow, paler than 



the pale areas on the trunk, the granules on the keels black, the inferior keels more diffused with black ; 



fifth segment with its sides and under surface blackish; vesicle blackish, red above like the upperside 

 of the fifth segment ; mandibles infuscate ; chelae yellow for the most part, a blackish spot at the tip of 



the brachium, the hand deep reddish-brown with black keels, fingers blackish with pale tips ; legs a rich 

 yellow like the humerus and brachium, with the maxillary processes of first and second pairs apically 

 infuscate ; pectines pale. Carapace and terga granular, as in C. gracilis; sterna also as in that species, 

 but the third more thickly pitted mesially, and the fourth and fifth finely and closely granular mesially 

 as well as laterally, the second and third also very weakly granular mesially. Tail and chelce practically 

 as in C. gracilis. In the male the caudal keels are smoother than in C. gracilis, those on the fifth 

 segment being almost entirely smooth, and the vesicle is more globular and more uniformly sloped on 



each side of the aculeus. Pectinal teeth 26-28, § ; 28-29, $ . 

 Measurements in mm. — 2 . Total length 109, carapace 10 ; tail 63, second segment 9-5, fifth 11*8. <$ . Total 

 length 120, carapace 11 ; tail 82, second segment 13, fifth 15. 



Hab. Costa Rica, Pozo Azul de Pirris, Atlantic slope (Zeledon *), Santo Domingo de 

 Golfo Dulce, in the straw of old roofs (Pittier 1 ), Carillo ( Underwood) ; Panama, Chiriqui. 





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14. Centruroides limbatus. (Tab. VIIL figg. 1, 1 a, <s .) 



Centrurus limbatus, Pocock, Ann. & Mag. Nat. Hist. (7) i. p. 387 (1898) l ; Kraepelin, Das Tierr., 



Scorpiones et Pedipalpi, p. 92 (1899) 2 . 



Allied to the foregoing, but strikingly different in colour ; carapace and terga yellow or reddish with black 

 margins, ocular tubercle black, chelicerse yellow at base, infuscate apically ; first four segments of tail 

 uniformly yellow, with granules on keels darker, fifth segment and vesicle deep blackish-brown ; sterna 

 entirely yellow, with blackish side margins, and in female clouded with black mesially; legs entirely 

 yellow, including apices of maxillary processes ; chelae entirely yellow, except the digits, which are black 

 with pale tips. Granules on trunk, tail 9 and chelce much finer than in C. bicolor ; sterna granularly 

 coriaceous as in that species. Pectinal teeth 22-23, £ ; 25, <S . 



Measurements in mm. — Total length 100, carapace 9 ; tail 70, second segment 11, fifth 12*5. Another 

 specimen ( J ) measures 125 mm. The only known female of this species is young, and measures 66 mm. 



in total length. 



Hab. Costa Rica, Sirires in Talamanca (Pittier 1 ), Sipurio in Talamanca {Cherrie). 



(in note) (1844) \ 

 (1898) 2 ; Kraepelin, Das Tierr., 







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15. Centruroides nigrimanus. 



t Scorpio (Atrmis) edwardsii, Gervais, Arch. Mus. Paris, iv> p. 21: 

 Centrurus nigrimanus, Pocock, Ann. & Mag. Nat. Hist. (7) i> p. 388 



Scorpiones et Pedipalpi, p. 93 (1899) 3 . 



(S . Resembling the male of C. bicolor in colour, but more coarsely and closely granular above, the fifth caudal 

 segment having its crests very distinctly granular, and its interstices also granular, whereas in C. bicolor 

 this segment is almost entirely smooth throughout ; vesicle very different in form from that of C. bicolor, 

 being strongly compressed antero-posteriorly, its height equal to the width of the humerus (in C. bicolor 

 ' its height is considerably greater than the width of the humerus), flat behind, parallel- sided, and 

 laterally pitted, the aculeus more abruptly bent backwards from the base, and the subaculear tooth very 



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