Genus Callinectes. 577 



This species is entirely distinct from any of those of the 

 eastern coast of North America. In the abdomen of the 

 male and its intromittent organs, it bears a resemblance 

 to the hastatus, but is easily distinguished from that species 

 by the dilferent curvature of those organs and the flatness 

 of the abdomen, as well as in the characters of the front, 

 which has four equal teeth. The narrowness of the car- 

 diac and intra-medial region, and the lobation of the 

 former, are also quite characteristic. 



Locality, Cape St. Lucas. Collected by John Xantus, 

 Esq. Museum of the Smithsonian Institution. 



It is one of the largest species known, equalling even 

 the hastatus in size. 



CALLINECTES BELLICOSUS Ordway. 



Lupa bellicosa, (Sloat MS.) Stimpson, Notes on North 

 American Crustacea, p. 11. 



The carapax is quite smooth and evenly convex, the 

 areoiations not being^rominent, and the granulation quite 

 fine. The front has two outer slender and sharp teeth, 

 with the faint traces of two median ones. The teeth of 

 the antero-lateral border are rather broad and sharp, with 

 somewhat concave sides. The sternum is rather flat and 

 broad, and has scattered punctures on its surface. The 

 abdomen of the male is broad, broader even than in /las- 

 tatus ; its penultimate segment is not narrowed near its 

 base, as in that species, but has a broad base, and is con- 

 tracted near the centre. The meros of the chelipeds, in 

 the only specimen that I have seen, has four spines on the 

 anterior border. There are two small spines on the car- 

 pus, one at the outer border, the other at its point of artic- 

 ulation with the manus, with a slight rudiment of one 

 between them. There is one very prominent granulated 

 ridge on the carpus, and two or three granulated tubercles. 

 One quite prominent spine on the carpus of the first three 



JOUKNAL B. a. K. II. 73 



