40 PROCEEDINGS OF THE NATIONAL MUSEUM vol. lu 



are now necessary for the recognition of species in Mestosoma and 

 related genera; therefore, this opportunity is taken to provide more 

 adequate illustrations. It will be noticed that the gonopods in 

 Mestosoma, as well as in some related genera of the Andean region, 

 are quite similar to those found in oriental genera such as Orthomor- 

 phella. The telopodite is bent into nearly a complete circle, with 

 the postfemoral region set off by a distinct cingulum, and modified 

 into laminae medialis and lateralis that sheath the long slender sole- 

 nomerite 



The South American diplopod fauna is still very poorly known, 

 and it is thus enth-ely possible that seinirugosum was introduced into 

 Dominica from a mainland population. But this species does not seem 

 to be identical with any species known from the more civilized parts of 

 the continent, whence one would logically expect the species to have 

 been transported. So far no other species of this genus have been 

 found elsewhere in the West Indies or on the fairly well explored 

 island of Trinidad, and it may be that semirugosum is the result of 

 introduction by rafting or some other natural means from a remote 

 interior species. 



Literature Cited 



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 Brolemann, Henri W. 



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