THE CANCROID CRABS OF AMERICA 345 



inward, tip similar to first tooth and equally (in the old) or nearly 

 as advanced as the first tooth. The coalesced first and second tooth 

 is uncommonly long and narrow, its width at base is equal to width 

 of fourth tooth, its extremity is narrow with a small emargination. 

 Third tooth short and broad, anterior margin concave or (in the old) 

 slightly sinuous, outer or posterior margin convex, acute, tip pointing 

 slightly inward. Fourth tooth larger than third, anterior margin 

 concave, posterior convex, acute tip pointing directly forward. Fifth 

 tooth of good size, although smaller than third, narrow, conical, 

 directed outward and slightly forward. 



Subdistal tooth of merus of chelipeds acute. Distal furrow of 

 carpus faintly indicated. Palms elongate, much higher at distal than 

 proximal end; a few low uneven tubercles on inner side of proximal 

 half of upper surface. Major propodal finger nearly horizontal, minor 

 one deflexed, tips of both upturned, color not quite covering base of 

 finger. Ambulatory legs long and narrow, propodus of last pair only 

 slightly wider than that of fourth pair. 



Abdomen of male elongate, sixth segment a little wider than its 

 greatest length, free edge of terminal segment broadly rounded. 



Color. — Carapace, dark bluish brown; upper surface of chelipeds 

 lighter violet brown; both carapace and chelipeds spotted with irreg- 

 ular blotches of dark reddish brown. Under surface of chelipeds 

 orange yellow. Fingers light brown, white at tips. 



Measurements. — Male (40427), length of carapace 35.6, width of 

 same 51.2, fronto-orbital width 30, width of front 15.7 mm. 



Relation. — Nearest to P. herbstii forma crassa which, however, has 

 more short transverse markings on the carapace, a wider coalesced 

 lateral tooth, narrower front, less prominent lower orbital margin, 

 and more extensive color on immovable fingers. 



Range. — From Mexico (Magdalena Bay and Guaymas) to Peru. 



Material examined. — Guaymas, gulf side, Mexico; under stones; 

 scarce; f'ebruary 27, 1891; P. L. Jouy; 5 males, 2 females, 1 young 

 (16080, 16081). 



Gulf of Fonseca, Salvador-Nicaragua; J. A. McNiel; specimens in 

 M.C.Z. 



Puntarenas, Pacific-Estero side, Costa Rica; inhabits mangroves; 

 February, 1905; J. F. Tristan; 2 females (32326). 



Puntarenas, Costa Rica; January 10, 1927; M. Valerio, 1 male 

 (60836). 



Canal Zone, Panama; Meek and HUdebrand, Smithsonian Biolog- 

 ical Survey: Corozal; April 20-21, 1911; 1 male (44182), 1 male 

 (Field Mus.). Balboa; tide; February 1, 1912; 1 female (59320). 



Mouth of Rio Tumbes (Boca Alamo), Peru; in casting net; January 

 15, 1908; R. E. Coker; 1 male (40427), received from Peruvian 

 Government. 



