DECAPOD CRUSTACEANS OF THE WEST INDIES 3 



Guinotia (Guinotia) reflexifrons (Ortmann, 1897). This species, wliich was 

 described from the Upper Amazon, was represented in the Berlin Museum by a 

 doubtfully documented specimen from the "Antilles." 



Guinotia (Neopseudothelphusa) simoni (Rathbun, 1905). The male specimen of 

 this species from the "Antilles" received by the Smithsonian in exchange from 

 the Kiel Museum is correctly identified, but the documentation seems doubtful, 

 for the species is known otherwise only from Venezuela. 



Sarmatium curvatum (H. Milne Edwards, 1837). It is questionable whether 

 the unique type-specimen of Metagrapsus pectinatus H. Milne Edwards, 1853, a 

 synonym of this otherwise West African grapsid crab, originated in "Martinique." 



Sesarma (Chiromantes) huzardi (Desmarest, 1825). As indicated by Monod 

 (1956), the documentation of the single specimen of this species from "Barbados" 

 in the Paris Museum needs verification. 



Uca maracoani (Latreille, 1802-03). As mentioned by Holthuis (1959), "An 

 old record (by Sloaiie, 1725) of the species from Jamaica is very doubtful." 



Uca pugilator (Bosc, 1801-02). The single record of this species from Jeremie, 

 Haiti, in the Museum of Comparative Zoology at Harvard is decidedly suspect. 



Uca spinicarpa Rathbun, 1900c. The specimen from Kingston Harbor, Jamaica, 

 recorded by Rathbun (1918) as this species, proves to be U. speciosa. 



Uca tangeri (Eydoux, 1835). The record by Miers (1881b) of material of this 

 species from the "West Indies" in the British Museum seems questionable. 



We scarcely need to call attention to the lack of completeness of 

 this review. Most investigations of this kind generate questions that 

 can be answered only by further study, and this one is no exception. 

 Why do most of the freshwater slirimps on Dominica display brown 

 and blue color phases? Are the rather distinct color patterns of both 

 Jonga and Micratya determined by genetic or environmental causes? 

 How does one explain the apparent difference in mean rostral length 

 in populations of Xiphocaris inhabiting the same pool in different 

 years? Is there more than one definable taxon represented by the 

 name Macrobrachium faustinum, and what morphological characters 

 can be used to distinguish immature individuals of this species from 

 those of M. crenulatum? Is Sesarma miersii reaUy distinct from the 

 Brazihan *S'. angustipes, and is it as rare on Dominica as indicated by 

 our collections? Is S. ricordi nowhere to be found on Dominica and, 

 if not, why? How is color change effected in populations of Ocypode 

 on black beaches? Is the third species of Uca in our collections un- 

 described, or is the single specimen an aberrant example of a known 

 species? We hope that other students wiU be motivated to seek the 

 answers to these and other questions suggested by the survey. 



Most of the 7,225 specimens in the collections from Dominica 

 (including about 350 immature individuals of Macrobrachium that 

 could not be identified satisfactorily and that are therefore not Hsted 

 among the material examined of any of the species) were obtained 

 by Hobbs during two visits to that island, from January to April in 

 both 1964 and 1966, but valuable material, as weU as photographs 

 and field notes, has been gratefully received from the following 

 participants in the Dominican Survey: Donald M, Anderson, Dale F. 



