X. PROCAMr.ARUS, A NEW SUBGENUS OF THE 

 CxENUS CAMBARUS. 



By a. E. Ortmaxn, Ph.D. 



In a i)aper just published (Proc. Anicr. Pliil. Soc, vol. 44, 1905, 

 p. 91), the i)resent writer has divided the genus Cambarus into four 

 subgenera : Cambarus (se/is. strict.), Cambarellits, Faxoniiis, and Bar- 

 toniiis. The first of these {Cambarus') is framed to receive the first 

 and second group of this genus, as distinguished by Faxon (excluding 

 C. f<cllucidus, which I refer to Faxonius). 



In the paper referred to (p. 99), the writer has indicated, that the 

 association of Faxon's first and second group into one subgenus might 

 possibly not be entirely correct, but, that a division according to the 

 number of legs which possess hooks on the ischiopodite, as introduced 

 by Faxon, does not exactly correspond to the natural affinities. He 

 also pointed out, that possibly the shape of the copulatory organs of 

 the males of certain Mexican and Cuban species is more important in 

 this respect. 



The Carnegie Museum has lately purchased fr(5m Professor J. S. 

 Hine, Columbus, O., a number of specimens of a new species of G?;//- 

 /;ar//j- from Guatemala (Ace. No. 2778; Cat. Nos. 74,56oand 74,561), 

 belonging in this group, which, in the paper referred to, has been 

 designated as the digueti-gxowi^ (of the section of C. digueti), con- 

 taining hitherto three species {digueti, mexicauus, cubensis). An 

 examination of the copulatory organs of this new form, and their com- 

 parison with the figures of these organs of C. carinaius, = digueti and 

 cubensis, with the description of these organs in C. mexicauus, and 

 with a male cotype of C. digueti, kindly presented by Professor 1*^. 

 Bouvier. of Paris, has led to the conclusion, that all these species, as 

 w^ell as the new one to be described herein, possess a type of male 

 copulatory organs, which is (juite peculiar, and differs considerably 

 from that seen in other si)ecies of the subgenus Cambarus (type: C. 

 b/andiiigi). 



The description of this organ, as given by Faxon for his first and 

 second groups, and by the pre.sent writer for the subgenus Cambarus, 

 does not ap])ly at all to these Central American and Cuban species. 



435 



