70 THE BKACHYURA. 



Outer sinus of orbit V-shaped ; tooth at inner angle thickened. 



Chehpeds strong, unequal, rough with sharp granules which are very 

 large on the wrist and hand. 



Inner angle of wrist blunt, not produced ; below it a sharp tooth ; a deep 

 sulcus parallel to distal margin. On the upper surface of the hand are two 

 deep sulci ; on the lower surface the granules are smaller and more de- 

 pressed ; inner surface with a coarsely granulated area, reaching from the 

 middle to the upper margin. Fingers deeply sulcate, dactylus granulate on 

 basal portion in large cheliped, and on basal half in small cheliped. Fingers 

 not gaping in small cheliped, slightly gaping in large one ; large dactyl with 

 a strong basal tooth. 



Legs spinulous. The merus has a single row of spinules on anterior 

 margin, the carpus and propodus each three rows, but on these joints the 

 spinules are obscured by hairs ; upper surface of merus almost smooth, of 

 next two joints more or less rough with sharp granules. 



Dimensions : — £ type, length 7 mm., width 10 mm. ; fronto-orbital width 

 5.7 mm.j frontal width 3 mm. 



Type locality : — This species inhabits Taboguilla Id., Panama. The type, a 

 £, was taken at low tide at a depth of one fathom, from coral, Oct. 31, 1904 

 (Cat. No. 32,859, U. S. N. M.). A much smaller £ was taken between tide 

 marks, Oct. 31, 1899. 



The nearest species is 31. truneatifrons Rathbun 1 from deep water in the 

 Caribbean region, which has a horizontal front, the carapace with fewer hori- 

 zontal markings and rougher behind, the inner prominences of the wrist 

 spiniform, the legs much more slender. 



Xanthodius sternberghii Stimpson. 



Xanthodius sternberghii Stimpson, Ann. Lye. Nat. Hist. N. Y., 1859, 7, 52. 



Taboguilla Id. ; between tide marks ; Oct. 31, 1899; 5 £, 7 ?. 

 Perico Id., Panama ; Oct. 26, 1901 ; 1 £ . 



Cycloxanthops vittatus (Stimpson). 



Xantho vittata Stimpson, Ann. Lye. Nat. Hist. N. Y., 1860, 7, 206. 



Cycloxanthus vittatus A. Milne Edwards, Miss. Sci. au Mexique, Zool., 1879, pt. 5, 1, 

 259, pi. 46, fig. 5. 



Perico Id., Panama, Oct. 26, 1904 ; 1 £. 



1 Bull. Lab. Nat. Hist. State Univ. Iowa, 1898, 4, 274. 



