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SCOEPIONES. 



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The median rows of teeth on the digits of the chelce not overlapping at the apices and flanked on each side 



by rows of more scattered teeth, which occupy the interspaces between the large lateral teeth. Pechnes 

 narrow, only gradually attenuate from base to tip ; without enlarged basal lobe. Sternum of first 

 abdominal segment with an ill-defined shallow depression, not a distinct groove, on each side running 

 forwards from the inner extremity of the stigma and with no definite depressed lateral area beneath the 

 pectines. Tail without median lateral keel on the second and third segments, always narrowed posteriorly 

 in the female and generally also in the male, and always longer and not broader in the male than in the 

 female. 



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Type C. exilicauda (Wood). 











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Distribution. Southern States of North America (California, Texas, Florida) ; West 











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Indies, Bahamas, and the islands of the Caribbean Sea; Central America as far 

 south as Panama, whence one species spreads along the Andean Chain through 



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Colombia and Ecuador as far as Chile. 





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Synopsis of the Species. 













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a. Fingers of the chelae furnished with eight rows of teeth along the middle 



line (or seven when the two proximal rows are coalesced), without 

 including the apical row. 

 a 1 . Fingers black, at least on the basal half, and sharply contrasted with 



the pale- coloured hand. 

 a 2 . Terga with broad, median, and lateral pale bands; hands very wide, 



in female equalling, in male much exceeding width of second 

 caudal segment; subaculear tooth minute or absent . . . . . 



b 2 . Terga with narrow median and lateral pale bands ; hands in female 



much narrower than second caudal segment, in male a little 

 narrower ; subaculear tooth large ........... 



b l . Fingers practically the same colour as the hand. 



a 3 . Upperside of trunk, chelae, legs, tail, and the abdominal sterna 



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marbled with black and yellow ; pectinal teeth 13-15 . . . . 

 b z . At least the first four abdominal sterna uniformly pale; pectinal 



teeth not less than 16. 



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a\ Upperside of abdomen ornamented with a pair of black bands 





nitidus, Thor. 























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flavopictus, Poc. 



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thorelli, Kraep. 



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separated from each other and from the lateral border by yellow 

 bands. 



a\ Carapace yellow only at the sides, the whole of the interocular 



triangle and the area behind the tubercle fuscous. 

 a\ Subaculear tooth close to base of aculeus ; black bands on 



terga hardly or not wider than median and lateral pale 

 bands ; tail in male very long and slender; the vesicle more 







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than twice as long as high ........... 



b\ Subaculear tooth remote from base of aculeus; black bands 



vitlatus, Say. 



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on trunk quite twice as wide as the yellow bands ; vesicle 



in male less than twice as long as high . . . # . ■ • . . 

 b\ Carapace rarely uniformly yellow, more usually marked with 



ornatus, sp. n. 



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