THE CANCROID CRABS OF AMERICA 515 



and young males it is more restricted, from a little less than half to a 

 little more than half in the major palm, and a small spot at base of 

 propodal finger in the minor palm. A few tubercles on dactylus 

 near articulation. Fingers of male with shallow grooves indicated by 

 lines of punctae, of female with deep grooves in minor chela and in 

 propodal finger of major chela. Ambulatory legs pubescent and 

 bordered with fringes of club-shaped setae mixed with long fine hair. 



Color. — Carapace under pubescence bright red as is also the bare 

 part of the palms. (A. Milne Edwards.) 



Measurements. — Male (11192), entire length of carapace 8.8, entire 

 width of same 12, fronto-orbital w4dth 7.8, width of front 3.8 mm. 



Range. — North Carolina; Bahama Banks and coasts of Florida to 

 Virgin Islands. 



Material examined. — See table, pages 516-518. 



PILUMNUS PYGMAEUS Boone 



Plate 207, Figures 4 and 5 



Pilumnus pygmaeus Boone, Zoologica, vol. 8, 1927, p. 221, text-fig. 81 (type- 

 locality, off Hood Island, Galapagos, 15 feet; holotype female in Mus. New 

 York Zool. Soc). 



Diagnosis. — Carapace and chelipeds granulate, not spinous. Lat- 

 eral teeth obscure, edge denticulate. Size small. 



Description. — Carapace transversely suboval, posteriorly narrow- 

 ing rapidly; convex, especially antero-posteriorly ; regions feebly 

 indicated except the anterior part of the gastric region which is 

 plainly marked; surface irregularly hairy, anterior two-thirds granu- 

 late. Anterior margins also granulate. Front cut by a large median 

 V-shaped emargination into two oblique, subentire, and slightly 

 convex lobes; median notch not visible in dorsal view. Lateral 

 margin having three (not counting orbital angle) long, shallow, 

 scarcely projecting and equally spaced teeth, the edges of which are 

 unequally and bluntly denticulate. 



Chelipeds very unequal, stout, hairy, granulate; palms swollen; 

 fingers rather short, tips light colored. In the major chela the pre- 

 hensile teeth are unequal, the largest one near base of fixed finger. 

 Ambulatory legs with margins granulate and hairy. 



Measurements. — Ovigerous female, paratype, total length of cara- 

 pace 2.6, width of same 3.5, fronto-orbital width 2.5, width of 

 front 1.4 mm. 



Range. — Galapagos Islands. 



Material examined. — Off Hood Island, 15 feet; station 54, Arcturus 

 Oceanographic Expedition; 1 ovigerous female, paratype (Mus. New 

 York Zool. Soc). 



