62 



BULLETIN 129^ UNITED STATES NATIONAL MUSEUM 



The basal segment of the antenna has on its margins two ridges 

 which anteriorly converge, and at its external angle an oblique spine 

 or tooth visible from above; the marginal ridges may be smooth to 

 the naked eye or more or less denticulate or spinulous. 



The maxillipeds have a longitudinal, denticulate ridge on the outer 

 part of the ischium ; antero-internal corner of merus projects sharply 

 and obliquely forwards. 



Chelipeds of male long and heavy in comparison to the body; 

 merus subcylindrical ; palm stouter, increasing distally, margins 

 convex, surface sparingly spinulous, spinules arranged more or less 

 in rows, especially along the margins of the inner surface; both fingers 

 curved, a larger tooth at base of the fixed finger, which is strongly 

 bent down in male, leaving a narrow, oval gape. 



Fig. 17.— Inachoides laevis, male (43023), right chela, 6.3 mm. long. a. inner side. 6. outer 



SIDE. 



The second, third, and fourth ambulatory legs are nearly the same 

 length, the carpus and propodus are subequal to each other, and the 

 dactylus falciform; first leg not much longer but slenderer, dactylus 

 straighter. 



Sternum of male with a large tubercle on either side in front of 

 the abdomen. 



Variations. — A most variable species. Differs in proportion of 

 length to breadth of carapace, in length of rostrum, smoothness of 

 carapace, in roughness of margins of basal article of antenna and 

 size of tubercles on hand. See notes under "Material examined." 



Measurements. — Male, cotype, length of carapace 10.7, width 8.2, 

 length of cheliped 22.8 mm. 



Range. — From west coast of Florida to Desterro, Brazil; from 

 Magdalena Bay, Mexico, to Panama. 



