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SC0KPI0NES. 



close to its base, and with its apex turned towards the aculeus, the distance between the two being less, 

 or at least not greater, than the basal width of the tooth. Legs more coarsely granular externally than 

 in C. bicolor. Pectinal teeth 32-33. 



Measu 



—Total length 110, carapace 9*5 ; tail 76, second segment 12*5, fifth 15. 



Hah. Mexico, Oaxaca (M\ 



Brit 



i 



Honduras (Indo- Colonial Exhio. 1 ) 





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It is highly probable that the specimen from Oaxaca in the Paris Museum recorded 



byG 



1 



as a v 



ery distinct variety of 



this species 



(At r wus) edwardsii, Gerv., is referabl 







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RHOPALURUS. 





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16. Centruroides nigrescens. (Tab. VIII. figg. 2 



$ 



3. 3 



Ma 



i. p. 389 (1898) x ; Kraepelin, Das Tierr., 



Scorpiones et Pedipalpi, p. 93 (1899) 



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Colour alike in both sexes, and differing from that of all the species closely related to C. gracilis in being of a 

 uniform blackish-green on the upperside of the trunk, the tail, legs, and chelae, the tarsi only and the 

 distal half of the lingers being, however, pale ; coxae and sternal plates mesially yellowish-brown ; pectines 

 Savons. Upperside of trunk coarsely and closely granular. Sterna smooth and polished, not coriaceous 

 or granular, except the fifth. Tail with all the keels coarsely granular in the female, less so in the 



vesicle in male of the same shape as in O. nigrimanus ; in female the subaculear tooth equally close 



b 



male 



to the base of the aculeus. 



Pectinal teeth 25-27 



2 ; 28-30, tf . 



Measurements in mm. — £ • Total length 85, carapace 8*5 ; tail 53, second segment 8, fifth 10*5. c?. Total 

 , length 107, carapace 8-8 ; tail 73, second segment 11*5, fifth 14. 



Hah. Mexico, Xautipa and Amula in Guerrero, Orizaba (ff. II. Smith 1 ). 

























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17. Centruroides fulvipes. (Tab. VIII. figg. 4, 4 a, $ 



rurus fulvipes, Pocock, Ann. & Mag. Nat 

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



i. p. 390 (1898) J ; Kraepelin, Das Tierr., 



$ . Structurally resembling C. nigrescens, but totally different in colour, the trunk brownish-black above, the 

 last tergite paler than the others ; tail blackish posteriorly and beneath, the upperside of the first, second, 

 and third segments reddish-brown ; chelse with trochanter and humerus yellow ; brachium, hand, and 

 base of fingers blackish-brown, nearly the whole of the fingers deep brown ; legs and coxas reddish-yellow, 

 maxillary processes not infuscate. Pectinal teeth 28-29. 



Measurcmen ts 



— Total length 83, carapace 8-5 ; tail 52, second segment 7*5, fifth 10. 



Bab. Mexico, Xautipa in Guerrero 1 2 (H. H. Smith) 



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Rliopalurus, Thorell, Ann. & Mag. Nat. Hist. (4) xvii. p. 9 (1876) ; 



P 



M 



Hete 



Soc. Ital. Sci. Nat. 



(Type R. laticauda.) 



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(Type H. mnceux\ 



Wiss 



Pedipalpi, p. 87 (1899) 



119 (1891); Das Tierr., Scorpiones et 



Eesembliug Centruroides in the dentition of the fingers of the cheke, but differing in havin* the tail in the 

 female a httle wider in its posterior than in its anterior half, and in the male much wider' than in 



the female. 



The first sternal plate of the abdomen is marked with a pair of grooves, which are much 

 deeper than m Centruroides, and run forwards and inwards from the inner edge of the sti-mata to meef 

 close behind the anterior border of the sternum, and form the inner boundary of a depressed area upon 



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