374 ME. E. I. POCOCK ON THE 



Contributions to our Knowledge of the Arthropod Fauna of the 

 "West Indies. — Part I. Scorpiones and Pedipalpi ; with a 

 Supplementary Note upon the Freshwater Decapoda of 

 St. Vincent. By E. I. Pocock, of the Natural History 

 Museum. (Communicated by W. Peecy Sladen, Sec. 

 Linn. Soe.) 



[Eead 16tti March, 1893.] 



(Plates XXIX. & XXX.) 



Tke following report upon the above-mentioned groups of 

 Arthropoda is based upon the material obtained by the collectors 

 in the employ of the Committee for the Exploration of the 

 Fauna and Flora of the Lesser Antilles. But to render the 

 report as complete as possible and of greater use to naturalists 

 resident in the West Indies, descriptions are given of all the 

 species that have been recorded from or that are otherwise known 

 to exist in any of these islands. Trinidad, as being politic- 

 ally one of the "West-Indian groups, has been here included, 

 although zoologically ^ this island is but a portion of the main- 

 land of Venezuela. 



It is a noticeable fact with regard to the Scorpion fauna of 

 these islands, that whereas the species that are found in Cuba, 

 Hayti, Jamaica, and Porto Eico occur also in Central or South 

 America, those that are found in the Lesser Antilles are appa- 

 rently peculiar to those islands. 



Owing to the unsatisfactory state of our knowledge of the 

 families of Scorpions, I have not in this paper adopted any 

 names for groups of this rank. The synoptical table, however, 

 that has been supplied of the genera will, it is hoped, remove all 

 difficulties in the way of determining the genus of any speciea 

 that may require a name. 



The species that I have not seen are marked with an asterisk. 



SCORPIONES. 

 Synopsis of the Genera of West- In dian Scorpions. 



4i. The sternum of the cephalothorax laterally 



compressed, minute and triangular. 



a^. The intervals between the large teeth 



forming the lateral series on the digits 



of the chelae not occupied by denticles. 



