THE CANCROID CRABS OF AMERICA 13 



Color. — Carapace tawny-olive lighter in the center; chelipeds and 

 legs wood brown. (After Milne Edwards and Lucas, fig.) 



Measurements. — Male (54212), length of carapace 52.4, width of 

 same 47.8, fronto-orbital width 19.5, width of front just anterior to 

 supraorbital eave 6.6 mm. 



Range. — West coast of South America, from Independencia Bay, 

 Peru, to Straits of Magellan. 



Material examined. — Independencia Bay, Peru; November 1919; 

 Robert Cushman Murphy; 1 male (54212), received from Brooklyn 

 Mus. 



Valparaiso, Chile: Gay; 1 female, cotype of P. armatus Milne 

 Edwards (20276), received from Paris Mus. 1 male (Copenhagen 

 Mus.). 



Chile; 1 ovigerous female, lent by Sao Paulo Mus. 



Family PORTUNIDAE 



SWIMMING CRABS 

 Portunidae Miers, Challenger Rept., Zool., vol. 17, 1886, p. 169. 



Carapace depressed, moderately transverse, and usually widest at 

 the last antero-lateral marginal spine. Front horizontal. Orbits and 

 eye-stalks nearly always of moderate length. Lateral teeth usually 

 from five to nine. Last trunk legs usually adapted for swimming, 

 with terminal joint ovate, flatly expanded. 



KEY TO THE SUBFAMILIES AND GENERA OF THE GENUS PORTUNIDAE 



A^ Eye-stalks of normal size. 



B'. No swimming paddles. Carapace with five antero-lateral teeth. 



Subfamily Carcinidinae, p. 14. 

 Carcinides. p. 14. 

 B-. The last pair of legs are swimming paddles. 



C Carapace not very broad, antero-lateral teeth 3 to 5. 



Subfamily Liocarcininae, p. 18. 

 D'. Antero-lateral teeth five. Front dentate. Antenna not excluded 

 from orbit. 

 EK Antero-lateral teeth similar, dentiform. Dactylus of 

 swimming paddles broadly oval. Male abdomen ob- 

 long Ovalipes, p. 18. 



W. A long spine at lateral angle of carapace instead of a tooth. 

 Dactylus of swimming paddles broadly lanceolate, 



pointed. Male abdomen triangular Bathynectes, p. 27. 



D'. Antero-lateral teeth three. Front subentire. Antenna excluded 



from orbit Coenophthalmus, p. 30. 



C^. Carapace usually very broad, antero-lateral teeth 9. 



Subfamily Thalamitinae, p. 33. 

 D'. Movable portion of antenna not excluded from orbit. 

 E'. A longitudinal ridge on the palate. 



F'. Outer maxillipeds not remarkably advanced; segments 

 of palp subcylindrical. 

 C. Abdomen of male triangular Portunus, p. 33. 



