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ARACHNIDA.-SCORPIONES. 



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PLATE VII. 





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Fig. 1. Centruroides margaritatus (Gerv,), ? , nat. size : 1 a, sternum of cephalothorax (st.), genital 



operculum (g.), pectine (pect.), and first abdominal sternum (st.abd.) showing the' 

 shallow grooves running obliquely inwards and forwards from the stigmata (to compare 

 with the same structures in Rhopalurus, Plate VIII. fig. 5a); lb, movable finger of 

 chela to show dentition ; 1 c, tarsus of fourth leg from the outer side to show the branched 



lew of the same to show the two pedal spurs (sp.) ; 



2. 



1 e } lateral view of extremity of tail. 

 ntruroides margaritatus (Gerv.), $ , 



2 b, Lateral view of extremity of tail. 



2 a, movable finger to show dentition : 



3. Centruroides gracilis, Latr., ? , nat. size, from Honduras : 3 a, lateral view of tail. 



4. 



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of tail. 



of extremity 



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view of extremity of tail. 



5 a, lateral 





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