rathbun: some cuban Crustacea. 459 



Cotypes of Saussure's Cambarus consobrinus are now dispersed in 

 the Museums of Geneva, Paris, Berlin, and Washington. Belike 

 Saussure's material embraced some of the typical form of C. cubensis, 

 though his description and figures were based on the form with long 

 rostral acumen, and distinct rostral and lateral thoracic spines; 

 the type locality of consobrinus, moreover, is the central part of the 

 island. 



In the cotype in the U. S. national museum (No. 20,684), a male 

 dried and transfixed with a pin, the rostrum is abnormal, the right 

 margin being pared away toward the tip, carrying with it the right 

 marginal spine. This deformity was evidently present in the living 

 specimen. On the left side the marginal rostral tooth or spine is well 

 developed, as are also the thorns at the front end of the post-ocular 

 ridges. The lateral thoracic spines are also fairly well marked. 



Cambarus cubensis rivalis, subsp. nov. 



This form is a denizen of the mountain streams of western Cuba. 

 The extent of its distribution remains to be determined by further 

 exploration of the island. The type specimens (M. C. Z., 7,406), 

 two males of the second form and three females, were captured by Dr. 

 Barbour in a mountain stream near San Diego de los Banos, in the 

 Province of Pinar del Rio. There are also specimens in the U. S. 

 national museum from the same place (28,626, 28,627) and from 

 a mountain brook north of the town of Pinar del Rio (23,656, 

 23,657). 



It differs from the typical form of C. cubensis (which lives in the 

 low country on the coast of Cuba) in having a much shorter and 

 broader areola, a shorter, broader, and more heavily granulated chela; 

 the sides of the rostrum, too, are more nearly parallel and bear a pair 

 of distinct lateral spines at the base of the acumen. In so far as the 

 rostrum is concerned it resembles C. c. consobrinus, but it differs from 

 that form by its short and wide areola and absence of lateral thoracic 

 spines. 



The sexual parts are like those of C. cubensis. 



Length of an ovigerous female, 44 nim., length of carapace, 21 mm., 

 length of areola, 6 mm., breadth of areola, 2 mm. 



