THE SPIDER CRABS OF AMERICA 123 



with dentate margins and a small tooth or spine at anterior ex- 

 tremity. Postorbital tooth or spine small, close to eye. Mcrus of 

 outer maxillipeds broad, with prominent outer and inner front 

 angles. Last two segments of abdomen in male and last three in 

 female anchylosed. Ambulatory legs of first pair very long in male, 

 more than twice as long as those of second pair; posterior pairs very 

 short. In the female all the ambulatory legs are short. Dactyli 

 rather long. 



This genus is very closely allied to Collodes, from which it differs 

 chiefly in its carapace, broader posteriorly, its smaller postorbital 

 tooth, in the shape of the hepatic region, which is angular in outline 

 instead of rounded, the anterior margin being at right angles to 

 median line, in the merus of the maxillipeds, which has the inner lobe 

 more produced and transverse than in Collodes, and in the great 

 length of the first ambulatory legs of the male. 



Found only in American waters, between Cape Hatteras, North 

 Carolina, and Rio de Janeiro, Brazil, on the Atlantic side, and on 

 the coasts of Lower California, Mexico, on the Pacific side. 



KEY TO THE SPECIES OF THE GENUS BATRACH0N0TU8 



A^ Postorbital tooth small, not nearly reaching end of eye. A large tooth on 

 immovable finger of male fragosus, p. 123 . 



A-. Postorbital tooth larger, reaching or nearly reaching end of eye. No large 

 tooth on immovable finger of male nicholsi, p. 127. 



Analogous species on opposite sides of the continent: fragosus 

 (Atlantic); nicholsi (Pacific). 



BATRACHONOTUS FRAGOSUS Stimpson 



Plate 39, figs. 1-4. 



Gripus januarii Kr0yer, nomen nudum, on label in Copenhagen Museum. 



Batrachonotus fragosus Stimpson, Bull. Mus. Comp. Zool., vol. 2, 1871, p. 122 

 (type-locality, south of Tortugas, lat. 24° 36' 40" N., long. 83° 02' 20" W., 

 16 fathoms; type not extant). — A. Milne Edwards, Crust. Reg. Mex., 

 1878, p. 180.— Rathbun, Proc. U. S. Nat. Mus., vol. 17, 1894, p. 54; 

 Bull. U. S. Fish Comm., vol. 20, for 1900, pt. 2 (1901), p. 57. 



Batrachonotus brasiliensis Rathbun, Proe. U. S. Nat. Mus., vol. 17, 1894, 

 p. 54 (type-locality, Rio de Janeiro; holotype, Cat. No. 19943, U. S. N. M.) ; 

 Bull. U. S. Fish Comm., vol. 20, for 1900, pt. 2 (1901), p. 57. 



Diagnosis. — Postorbital tooth small, not nearly reaching end of 

 eye. A large tooth at middle of immovable finger of male. Anten- 

 nal spines subparallel. 



Description. — Male: Carapace coarsely granulate, especially on 

 protuberant portions. Cardiac, gastric, and branchial regions and 

 first segment of abdomen each surmounted by a stout spine or 

 large tubercle. Two small tubercles on intestinal region just above 

 posterior margin, and one enlarged tubercle on the margin of the 



