THE CANCROID CRABS OF AMERICA 397 



outer surface. Fingers of large claw gaping, dactylus with a large 

 basal tooth, thumb a little deflexed, that of smaller claw more strongly 

 so. Fingers almost white in alcohol, color line oblique but not 

 extended noticeably on palm. Upper margins of ambulatory legs 

 granulate, carpal crests unevenly so; last two articles densely hairy. 



First segment of male abdomen with a transverse granulated crest; 

 penult segment much broader than long, and broader at anterior than 

 posterior margin; terminal segment broadly sub triangular. 



Measurements. — Male holotype, length of carapace 8.7, width of 

 same 13, width of front 3.5 mm. 



Range. — West coast of Nicaragua. 



Material examined. — Known only from the type-specimen from 

 Realejo; Oersted collector; one male (Copenhagen Mus.). 



HEXAPANOPEUS ORCUTTI, new species 



Plate 170, Figures 3 and 4 



Type-locality. — Near Modesto, Sinaloa, Mexico; September 29, 

 1922; 1 male holotype (Cat. No. 56688, U.S.N.M.). 



Diagnosis. — Lateral teeth with tuberculiform tips. Carpal furrow 

 turning backward at a right angle. Major manus with a furrow on 

 upper part of outer surface. Color of immovable finger prolonged 

 obliquely backward from interdigital sinus. 



Description. — Striae of dorsal surface ill defined, regional furrows 

 shallow. Margin of front slightly arched, as far as the well marked 

 outer teeth; median emargination minute. Upper orbital border 

 between fissures lobiform. Antero-lateral teeth similar, triangular, 

 shallow, and with thick tuberculiform tips; first tooth equilaterally 

 triangular and so deeply and widely separated from the second that 

 they do not appear coalesced; third tooth with a short anterior margin 

 directed a little forward and the posterior margin directed well out- 

 ward and backward; fourth tooth widest, its anterior margin running 

 slightly back to the tip, posterior margin longer, a little convex and 

 directed backward and inward to the small and narrow fifth tooth, 

 which points obliquely forward. 



Carpus of cheliped very lumpy, its distal furrow continued back- 

 ward at the outer end in a right angle. Upper part of major manus 

 compressed so that a longitudinal furrow is formed on the outer 

 surface. Color of both propodal fingers continued moderately on 

 palm, the terminal line beginning in the sinus at base of finger and 

 continued obliquely down and back in a sinuous line. The major 

 dactyl lacks a large basal tooth ; this may be an accidental rather than 

 a specific character. 



Sixth segment of male abdomen broader than long, sides mostly 

 parallel but curve inward a little at distal end. Terminal segment 

 very short and rounded at tip. 



