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ARACHNIDA-SCORPIONES. 







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PLATE I. 

















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Fig. 1. Opisthacanthus Upturns, Pal. de Beauv., £, nat. size: la, carapace; lb, extremity of 







chelicera from below ; 1 c, lower side of posterior end of cephalothorax and of anterior 



end of abdomen of <$ ($t. } sternum ; g., genital operculum ; pect., pecten) ; 1 d, ditto 





of $ , with lettering as above ; 1 e, lateral view of tail ; 1 /, anterior side of tarsus of 

 fourth leg with single pedal spur (sp.) ; 1 g, inferior view of same. 



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2. Diplocentrus whitei, Gerv., ? , from San Diego, Texas, nat. size : 2 a, extremity of chelicera 



from below ; 2 b, movable finger of chela ; 2 c, sternum, genital operculum, and pectines ; 

 2 d, lateral aspect of tail ; 2 e, lateral view of tarsus of fourth leg [sp., pedal spur) ; 



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2 f, lower view of same (sp., pedal spur). 

 3. Diplocentrus whitei (Gervais), £ , from San Diego, Texas, nat. size: 3 a, carapace and 



chela ; 3 b, sternum, genital operculum, and pectines ; 3 c, lateral view of tail; 3d, lower 









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side of the same. 

 4. Diplocentrus keyserlingi, Karsch, <J , nat. size (specimen from Mexico) : 4 a, carapace and 



chela ; 4 6, lateral view of tail ; 4 c, ditto from below. 

















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