THE CANCROID CRABS OF AMERICA 347 



in the genus; the carapace is distinctly widest between tips of teeth 

 of this last pair. 



Chelipeds somewhat shorter than in P. purpureus; subdistal tooth 

 on merus short and broad; carpus uneven, covered with reticulating 

 rugae, a distal groove present, inner tooth short, blunt; manus shorter 

 in relation to its height than in purpureus, covered on the greater 

 part of its surface inside and out by a reticulating color pattern; 

 upper surface somewhat flattened, grooved only at proximal end. 

 Color of immovable finger running well back on hand in male, espe- 

 cially on lower margin but more restricted in female; the major 

 finger is high at base and has on the prehensile edge a well-developed 

 subbasal tooth which helps to define the sinus into which the large 

 tooth of the dactyl fits. Ambulatory legs rather broad, especially 

 propodus of last leg; dactylus of this leg only a little longer than 

 propodus. The dactyls of the other legs are longer (1)^ times) than 

 their respective propodites. The legs besides a short tomentum 

 have a marginal fringe of tubular hairs. 



Abdomen of male strongly constricted between fifth and sixth seg- 

 ments ; terminal segment with rapidly convergent sides and a rounded 

 tip. 



Color. — General color bright bottle green, mixed with yellowish 

 above. Chelipeds bluish green above, bright yellow orange below, 

 fingers brownish. Legs and lower surface of body yellowish white. 

 (Milne Edwards and Lucas.) 



Measurements. — Male (13930), length of carapace 34, width of 

 carapace 48.4, fronto-orbital width 24, width of front 11.7 mm. 



Relation. — In the shape of the carapace, the narrow front and 

 orbits and the curve of the antero-lateral teeth coinciding with the 

 direction of the margin, this species resembles P. rugosus, but the latter 

 is much rougher and hairier, and the hands and fingers deeply grooved. 



Range. — From Sinaloa, Mexico, to Chile. 



Material examined. — States of Sinaloa and Nayarit, Mexico; 2-12 

 meters; Secretaria de Agricultura y Fomento; 1 male, 3 females 

 (1 ovigerous) (60233).** 



Mazatlan, Mexico; September 29, 1922; C. R. Orcutt; 1 ovigerous 

 female (56687). 



Maria Madre Island, Mexico; March-May, 1927; from Secretaria 

 de Agricultura y Fomento, through A. L. Herrera; 1 young male, 3 

 young females (60804). 



Carbon Island, Corinto, Nicaragua; J. A. McNiel; specimen in 

 M.C.Z. 



Punta Arenas, Pacific coast of Costa Rica; January, 1907; J. F. 

 Tristan; 1 male, 3 females (39086), received from P. Biolley. 



** " Species most abundant in oyster beds. Females were found with eggs in two different seasons; first 

 from May to July, and for the second time in December and January. I could not observe whether two 

 broods were hatched per annum; or only one, the females laying eggs at different seasons." 



