THE CANCROID CRABS OF AMERICA 15 



CARCINIDES MAENAS (LInnaens) 



GREEN CRAB; JOE ROCKER 



Cancer marinus sulcatus Rtjmph, Amboinsch. Rariteitk., 1705, pi. 6, fig. O. 

 Cancer maenas Linnaeus, Syst. Nat., ed. 10, vol. 1, 1758, p. 627 (type-localities, 



in Oceano Europaeo, Asiatico; type not extant); Fauna Suecica, 1761, 



p. 492. 

 Portunus maenas Leach, Edin. Encyc, vol. 7, 1814, p. 390. 

 Carcinus maenas Leach, Edin. Encyc, vol. 7, 1814, p. 429. — R. Rathbun, 



Fisheries and Fishery Industries of the United States, sec. 1, 1893, p. 774, 



pi. 265. 

 Portunus menoides Rafinesque, Amer. Monthlj- Mag., vol. 2, 1817, p. 42, 



(type-localities. New York, Long Island, New Jersey, etc.; types not extant). 

 Cancer granulatus Say, Journ. Acad. Nat. Sci. Philadelphia, vol. 1, Aug. 1817, 



p. 61 (type-locality, "bays and inlets near the sea" [east coast of the United 



States]; type not extant, according to Say). 

 Carcinus moenas De Kay, Nat. Hist. New York, pt. 6, Crust., 1844, p. 8, pi. 5, 



figures 5 and 6. 

 Carcinus granulatus S. I. Smith, in Verrill and Smith, Rept. Commr. of Fish 



and Fisheries, vol. 1, 1871-1872 (1873), pp. 313 [19] and 547 [253]. 

 Carcinides maenas M. J. Rathbun, Occas. Papers Boston Soc. Nat. Hist., vol. 



7, 1905, p. 8.— Sumner, Bull. Bur. Fisheries, vol. 31, 1911, part 2, 1913, 



p. 672. 



Diagnosis. — Legs of last pair partially natatory. Front three- 

 toothed. Lateral teeth six, similar. Palms and legs unarmed. 



Description. — Carapace about three-fourths as long as broad, gastric 

 region divided into 3 areolae, surface finely granular, especially in 

 anterior half. Middle lobe of front acute, antero-lateral teeth acu- 

 minate. Posterior border forming a curve with the postero-laterai 

 borders. Major diameter of orbit about half the width of interorbital 

 space. Antennal flagella about 1}^ times the length of the orbit. 



Major cheliped 1}^ times length of carapace; hand with two costae 

 on upper surface, otherwise smooth. Legs smooth and unarmed, 

 second and third pairs longest and about 1% times the length of the 

 carapace; fourth pair shorter than first pair. Sixth abdominal tergum 

 of male about twice as broad as long, with gradually convergent sides. 



Color. — Male (Woods Hole), green ground, mottled Avith black, 

 granules for the most part yellow; anterior half darker than posterior. 

 Lateral teeth tipped with yellow. Claws similar; on the palm there 

 are small black spots arranged longitudinally. Fingers and adjacent 

 portion of palm bright light blue, with black stripes in the grooves. 

 Prehensile teeth and tips of fingers flesh color. Legs green, speckled 

 with black; distal portion of dactyli light; tips horny. Under side 

 yellowish, deepest on the anterior portion. Female differs from the 

 male in having the ground color orange in place of green, granules 

 whitish. Chelae a duller blue. Under side deep orange. 



Measurements. — Male (9006), length of carapace 60, width of same 

 79.4, fronto-orbital width 33, width of front 15 mm. 



