THE CANCROID CRABS OF AMERICA 251 



KEY TO THE AMERICAN SPECIES OF THE GENUS ACTAEA 



A*. Areoles covered with granules. 



B*. Areoles low, separated by narrow furrows. 



C. Marginal divisions of carapace lobiform, not angular nor dentiform. 



D'. Carapace uniformly granulate. Black color of immovable 



finger of adult male widely extended on palm. Fingers 



grooved, sharply granulate setigera, p. 251. 



D^. Granulation finer and denser than in setigera dovii, p. 254. 



C^. Marginal divisions of carapace angular or dentiform. Carapace 

 narrower than in D'. Front steeply inclined. 

 Di. Palm concealed by long thick hair. Fingers long, smooth, 



punctate, not channeled bifrons, p. 255. 



D2. Palm with longitudinal rows of granules not concealed by hair. 

 Fingers deeply channeled, ridges granulate proximally, 



angusta, p. 256. 

 B*. Areoles high, convex, widely separated. 



C. Areoles separated by short pubescence. Anterior mesogastric nodule 

 small. 

 D'. Nodules 1 F not fused with frontal margin. Marginal lobes D 



and E not remarkably small rufopunctata nodosa, p. 257. 



D^. Nodules 1 F fused with frontal margin. Marginal lobes D and 



E remarkably small sulcata, p. 259. 



C^. Areoles raspberry-like, set in a thick coat of long hair. Palms 

 shaggy. Fingers broad, smooth, sharp-edged, acutely tipped. 



palmeri, p. 260. 



A'. Carapace covered dorsally with spines or sharp tubercles. Marginal lobes 



spinous acantha, p. 261. 



ANALOGOUS SPECTES OF ACTAEA ON OPPOSITE SIDES OF THE CONTINENT 



Atlantic Pacific 



setigera. dovii. 



bifrons. angusta. 



rufopunctata nodosa. sulcata. 



ACTAEA SETIGERA (Milne Edwards) 



Plate 103 



Xantho setiger Milne Edwards, Hist. Nat. Crust., vol. 1, 1834, p. 390 (type- 

 locality, Antilles; type in Paris Mus.). 



Actaea setiger Stimpson, Ann. Lye. Nat. Hist. N. Y., vol. 7, 1859, p. 51. 



Actaea setigera A. Milne Edwakds, Nouv. Arch. Mus. Hist. Nat., Paris, vol. 1, 

 1866, p. 271, pi. 18, fig. 2.— Rathbun, BuU. U. S. Fish Comm., vol. 20 

 for 1900, pt. 2 (1901), p. 34. 



Diagnosis. — Carapace wide, uniformly granulate; lateral lobes not 

 dentiform; black color of immovable finger of male widely extended 

 on palm; fingers grooved, sharply granulate. 



Description. — Carapace wide, ovoid, covered with short, stiff 

 yellow hair and with granules; strongly lobulated anteriorly. Antero- 

 lateral border divided into four lobes, which do not project beyond 

 the general outline of the carapace. Postero-lateral borders concave* 

 Median notch of front large; each lobe has an inconspicuous outer 

 tooth. Basal antennal joint short, not prolonged into orbit. Ptery- 



