78 BULLETIN 152, UNITED STA "ES NATIONAL MUSEUM 



the next two teeth. Five spines, proximal one small, on anterior 

 margin of arm of largest specimen, four spines only in smaller speci- 

 mens; a small spine at extremity of outer margin of arm; inner wrist 

 spine tmce as long as proximal spine of palm; outer wrist spine small, 

 slender; superior spine of palm about at distal fifth. 



In small specimens, the lateral spine is about the same relative 

 length as in large. 



Measurements. — Largest male (Mejia Island), total length of 

 carapace 21, width of same 35.5 mm. Male (18206), total length of 

 carapace 16, width of same 28, width at anterior base of lateral 

 spine 24, fronto-orbital width 13.7, width of front 4.7 mm. Male 

 (60019), total length of carapace 12.2, width of same 21, width at 

 anterior base of lateral spine 17.4, fronto-orbital width 11.3, width 

 of front 3.7 mm. 



Range. — Mexico: From Tiburon Island, Gulf of California to Tres 

 Marias Islands. 



Material examined. — See table, page 77. 



PORTUNUS (ACHELOUS) PICHILINQUEI, new specicis 



Plate 37 



Poriunus (Portunus) xantusii Rathbun, Bull. Amer. Mus. Nat. Hist., vol. 48, 

 1923, p. 620 (part). 



Type locality. — Pichilinque Bay, Lower California; holotj^pe male, 

 Cat. No. 60011, U.S.N.M. 



Diagnosis. — Front advanced. Antero-lateral teeth spiniform, 

 unequal; lateral spine long. Postero-distal margin of merus of 

 swimming feet spinulous. 



Description. — Another species allied to and easily confounded 

 with P. (P.) xantusii. It differs as follows: The carapace is nar- 

 rower; the front more prominent, its teeth flatter and blunt; antero- 

 lateral margin straighter, less arched, teeth slenderer, very unequal, 

 more spiniform and outstanding; lateral spine of good length, as 

 long as the width of the next three teeth; abdomen of male more 

 broadly triangular. 



From P. (A.) minimus, this species may be recognized by its 

 longer lateral spine, slender antero-lateral teeth and advanced front. 



Measurements. — Male (holotj^pe), total length of carapace 14.4, 

 width of same 26, width at anterior base of lateral spine 21, fronto- 

 orbital width 13.3, width of front 4 mm. 



Range. — Mexico: From Magdalena Bay to the head of Gulf of 

 California. 



Material examined. — See table, page 75. 



