llg BULLETIN 366, UNITED STATES NATIONAL MUSEUM 



Carpus of cheliped much broader than long; a large, blunt, triangular 

 tooth on outer surface; a more prominent, rectangular plate projecting 

 inward from inner surface. Chelae heavy; palms widening distally, 

 slightly convex in outline below; upper surface at right angles to outer 

 and marked by a low blunt ridge with a small tooth at either end; a 

 similar ridge below on outer surface. Fingers stout, fitting together 

 when closed; fixed finger triangular, curved slightly downward. 



Ovigerous females much smaller than males. Carpus with a 

 triangular inner tooth similar to the outer tooth and thereby widening 

 the carpus perceptibly toward distal end. 



CoZor.— Ovigerous female (69185), reddish specMed; others of this 

 haul gray, brownish, or white. 



Measurements. — Male (69221), length of carapace 4.5, width 5 mm. 

 Female, ovigerous, same locality, length 2.7, width 3.3 mm. 



Range. — Mexico to the Galapagos Islands. 



Material examined. — See table 37, page 117. 



CLYTHROCERUS DECORUS Rathbun 



Figure 30; Plate 34, Figures 3, 4 



Clythrocerus sp. Rathbun, Harriman Alaska Expedition, vol. 10, p. 169, pi. 9, 



fig. 5, 1904. 

 Clythrocerus decorus Rathbun, Proc. Biol. Soc. Washington, vol. 46, p. 185, 1933 



(type locality, off Santa Rosa Island, Calif., male holotype, U.S.N.M. no. 



67435) . 



Diagnosis. — Two lateral teeth or spines, the distance between them 

 less than between the foremost tooth and the orbital tooth. Two 

 frontal teeth with long, cylindrical tips. 



Description. — Carapace equally long and broad, depressed, regions 

 plainly marked, coarsely granulate, the granules disposed in groups 



Figure ZO.—Clylhrocerus decorus, male (67435): Carapace, dorsal view, X U. 



on the regions, furrows smooth. Front divided into two broad teeth 

 which terminate in blunt widely separated spines with parallel sides. 

 Orbit with a triangular notch above and an outer subacute spine. 

 Two stout, denticulate teeth or spines on anterolateral margin, the 

 interspace shorter than that between the anterior one and the orbital 

 spine. Lateral margin finely denticulate. Lower surface more 



