THE CANCROID CRABS OF AMERICA 155 



Albatross; 3 males (33459). Shore; June 19, 1906; Albatross; 2 males 

 (47965). 



Rakovaya Bay, Avatcha Bay, Kamchatka; August 13, 1896; 

 Albatross; 4 males, 2 females (32219). 



Tareinski Harbor, Kamchatka; 9 fathoms; taken in crab net; June 

 21, 1900; Albatross; 3 males, 1 female (32229). 



JAPAN. — Shana Bay, Yatorup Island, Kurile Islands; September 

 4, 1896; Albatross; 6 specimens (20124). 



Nemoro, Hokkaido; August, 1914; Fred Baker; 2 males (48846). 



Mororan, Hokkaido; 1900; Jordan and Snyder; 2 males, 5 females, 8 



young (26247); from Stanford University. 



Genus ERIMACRUS Benedict 



HORSE CRABS 



Podacanthus Brandt, Bull. Phys.-Math. Acad. St. Petersbourg, vol. 7, 1848, p. 



180; subgenus of Platycorystes Brandt; type, Plaiycorystes (Podacanthus) 



iscnbeckii Brandt. Podacanthus used by Gray in 1833 for a genus of 



Orthoptera. 

 Erimacrus Benedict, Proc. U. S. Nat. Mus., vol. 15, 1892, p. 229; substituted 



for Podacanthus. 



Carapace longer than broad, oblong-oval. Lateral margins 

 arcuate, armed with seven teeth. Front between the antennae cut 

 into two teeth. A tooth at inner angle of orbit. Antennae as in 

 Telmessus. Epistome with a nearly straight anterior margin. 

 Chelipeds stout; ambulatory legs very broad and spinous. The 

 genital openings of the female occupy the posterior wall of a deep 

 depression in the sternum and are not covered by the abdomen. The 

 side margins of the sixth segment of the abdomen are not deeply 

 incised. Abdomen of male triangular from the third segment. 



Contains only ouq species. 



ERIMACUS ISENBECKU (Brandt) 



Plate 68 

 Platycorystes (Podacanthus) iscnbeckii Brandt, Bull. Phys.-Math. Acad. Imper. 



Sci. St. Peterbourg, vol. 7, 1848, p. 180 (type-locality, Unalaska; type, Mus. 



St. Petersburg [Leningrad]). 

 Platycorystes isenbeckii Brandt, Middendorff's Sibirische Reise, vol. 2, pt. 1, 1951, 



p. 83. — RiCHTERS, Abh. Senck. Natur. Gesell., Frankfurt, vol. 13, part 4, 



1884, p. 402, plate, figs. 1 and 2. 

 Cheiragonus isenbeckii Brandt, Middendorff's Sibirische Reise, vol. 2, pt. 1, 1851, 



p. 147. 

 Erimacrus isenbeckii Benedict, Proc U. S. Nat. Mus., vol. 15, 1892, p. 229, 



pi. 26, figs. 5-7, and pi. 27. 



Diagnosis. — Carapace longer than broad. Epistome with nearly 

 straight anterior margin. Lateral margins of sixth segment of female 

 abdomen not deeply incised. Lateral teeth of carapace seven. 



Description. — Carapace covered with short bristles and acute 

 tubercles which form also about nine small elevations, 5 gastric. 



