CENTETJEOIDES. 



2.7 



* 



half times as long as carapace, which equals its fourth caudal segment in length ; its subaculear tooth 



longer than in C. elegans. Chelce as in the latter. 

 3 . Apparently resembling that of C. vittatus, being described as very slender, with the fifth segment rounded 



at the sides, with the inferior lateral crests very feebly developed, and the vesicle three times as long as 



wide and almost cylindrical. 

 Measurements in mm. — $ . Total length 46, carapace 4-5, tail 28. 



Eab. Centeal America K 



The description of the female given above is taken from one of the co-typical 

 examples received by the British Museum from Prof. Kraepelin. Although he describes 



* 



the species as " einfarbig gelbroth," and as having no trace of keels on the fourth 

 sternal plate, nevertheless the abdominal bands characteristic of C. elegans and crests 

 on the sternum in question are distinctly traceable in this specimen. 



- 



6. Centruroides bertholdi. 



[tal. Sci. Nat 





c? . Colour : upperside of trunk uniformly fuscous or subferruginous, tail a little paler towards the extremity ; 

 legs and chelae also uniformly coloured and paler than the trunk. Upperside of trunk thickly granular, 

 the granules not forming definite series ; the tergites with short lateral crests. Sterna smooth, coriaceous 

 laterally, the last with four crenulated crests, and very finely granular in front and laterally, and with a 

 large granule on each side between the keels and side margin. Tail very long and narrow, about eight 

 times as long as the carapace, which is shorter than its first segment, and about one-third the length of 

 the fourth + the fifth, fifth segment more than three times as long as broad and high, first about twice 

 as long as wide, third about three times as long as wide ; the surface very finely coriaceous, all the keels 

 on segments 1-4 normally granulate ; fifth segment almost smooth, with the superior edges widely rounded, 

 the keels at most represented by very minute granules, the lower keels weak ; vesicle ovato-cylindrate, 

 about twice as long as wide ; a slender conical subaculear tooth. Chelce normally keeled, very finely 

 granular above ; hand wider than brachium, the keels granular; movable finger with eight rows of teeth. 



Pectinal teeth 26-27. 

 Measurements in mm.— Total length 79*5, carapace 6-5 ; tail 51-5, its first segment 7, second 8-5, fifth 10'3 ; 



vesicle and aculeus 6*5. 



Eab. Mexico 1 . 



Judging by the description, this species, of which the male alone has been described, 

 differs from the rest of the uniformly-coloured Mexican forms in the extreme length 

 of its tail, which is almost eight times as long as the carapace, with its first segment 



the latter in length. In some respects it approaches C. margaritatus, but is 

 smaller, has the granules of the carapace not serially arranged, and the tail longer and 

 paler at the posterior end, instead of darker ; nor can the hand of C. margaritatus be 

 said to be furnished above with three granular keels running on to the immovable finger. 



According to Kraepelin, C. bertholdi is based upon the male of C. granosus, Thorell. 

 There appear to me to be grave reasons for doubting this. At all events, no great 

 weight can be attached to Kraepelin's opinion on this point, considering that the male 

 of the species from Curacoa he determined as C. granosus $ + C. bertholdi differs from 

 C bertholdi) Thor., in having no subaculear toothy the carapace longer than the first 



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