THE CANCROID CRABS OF AMERICA 269 



Upper and outer surface of wrist lobulated like the carapace but 

 without hairy tufts. The same surface of hand and dactylus covered 

 with more or less conical tubercles. Upper part of inner surface of 

 wrist and hand covered with a mosaic of flat markings; a similar 

 mosaic occurs on outer surface of arm and merus of legs, but on the 

 dactyli and propodites of the legs the tubercles are either spiny or 

 acute. Fingers pointed, cutting edges dentate in both chelae. 

 Lower edge and surface of merus of legs somewhat excavate to 

 receive the bulging of carpus and propodus in flexion. Upper edge 

 of legs down to the propodus fringed with hair which partially conceals 

 their sculpture. A few brushes of hair on under side of propodus 

 and dactylus. 



Color. — Specimens in alcohol are shaded brown, darker anteriorly. 



Measurements. — Female (5768), total length of carapace 26, 

 width 37 mm. 



Range. — Lower Cahfornia [" California," A. Milne Edwards] to Ecua- 

 dor (Nobili). 



Material examined. — Cape St. Lucas, Lower California, Mexico; 

 John Xantus; 1 male, type (1275, M. C. Z.). Socorro Island, Mexico; 

 Hanna and Jordan, California Acad. Sci. ; 1 young female, returned. 

 Panama; Capt. John M. Dow; 2 females, 1 young (5768). 



Genus CARPOPORUS Stimpson 



Carpoporus Stimpson, Bull. Mus. Comp. Zool., vol. 2, 1871, p. 138; type, C. 

 papulosus Stimpson. 



Carapace subhexagonal, nearly as long as broad; antero-lateral 

 margin in a line w^hich conducts beneath the orbit anteriorly, armed 

 with about three small teeth and drawn in posteriorly, the greatest 

 breadth of the carapace being at the penultimate tooth; postero- 

 lateral about as long as posterior margin; facial region very broad; 

 front prominent. Orbit circular. Basal article of antennae narrowing 

 forwards, reaching the front, and the hiatus of the orbit; movable 

 part of peduncle very small; flagellum about as long as eye. CheHpeds 

 when retracted having a large hole above between the carpus and 

 manus for the passage of water to the aflferent branchial apertures. 

 Third, fourth, and fifth segments of the male abdomen fused; ter- 

 minal segment as broad as long. 



Contains only one species. 



CARPOPORUS PAPULOSUS Stimpson 



Plate 110, Figures 3-6; Plate 111 



Carpoporus papulosus Stimpson, Bull. Mus. Comp. Zool., vol. 2, 1871, p. 139 

 (type-localities, SW. of Tortugas, 25 fathoms, and ofif Carysfort Reef, 52 

 fathoms; types not extant). — A. Milne Edwards, Crust. R6g. Mex., 1879, 

 p. 247, pi. 44, figs. 1-ld, 



