382 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



168-34. Academy Bay, Indefatigable Island, shore, Jan. 20, 1934, 2 



females. 

 199-34. Black Beach, Charles Island, shore, Jan. 30, 1934, 3 males, 



5 females. 

 313-35. Black Beach, Charles Island, shore, Dec. 6, 1934, 10 males, 



7 females (6 ovig.). 

 315-35. Opposite Gordon Rocks, Indefatigable Island, coral, Dec. 8, 



1934, 3 males, 3 females. 

 333-35. James Bay, James Island, shore, Dec. 11, 1934, 1 male. 

 343-35. Sulivan Bay, James Island, shore, Dec. 12, 1934, 3 males, 3 



females. 

 350-35. South Seymour Island, shore, Dec. 13, 1934, 1 female. 

 351-35. South of Black Beach, Charles Island, shore, Dec. 14, 1934, 



1 male, 2 females. 

 359-35. Osborn Island in Gardner Bay, Hood Island, shore, Dec. 19, 



1934, 3 males, 4 females (1 ovig.). 

 784-38. Darwin Bay, Tower Island, shore, Jan. 17, 1938, 2 males, 



3 females. 

 789-38. South Seymour Island, shore, Jan. 19, 1938, 10 males (1 



photographed), 10 females. 

 796-38. Sulivan Bay, James Island, shore, Jan. 21, 1938, 10 males, 15 



females, 1 young. 

 800-38. Cartago Bay, Albemarle Island, shore, Jan. 22, 1938, 3 females 



(1 ovig.). 

 803-38. Black Beach, Charles Island, shore, Jan. 23, 1938, 3 males, 



1 female. 

 804-38. Onslow Island, off Charles Island, coral, Jan. 23, 1938, 1 



male, 1 female. 

 811-38. Barrington Island, coral, Jan. 26, 1938, 2 females, 1 young. 

 Measurements. — Largest male: length 15.8 mm, width 13.9 mm, 

 cheliped 30.0 mm, chela 15.2 mm. 



Color in life. — Chelae dusky dark brown, fingers white. Carapace 

 light bluish gray. (Petersen). General appearance pink to magenta, the 

 lightest coloring about the leg joints. Chelipeds much darker, almost 

 black, dactyls pure white. A series of 17 remarkably uniform. (Garth) 

 Habitat. — Holes in narrow rock shelf and cave. (Finnegan) 

 Depth. — Shore to 6 fms. 



Remarks. — This species, nowhere abundant, was occasionally obtained 

 from coral, but more generally from ordinary rocky shore. Its flatness and 

 slender, naked chelae serve to distinguish it from the sponge-covered 

 young of Mithrax (Mithrax) bellii Gerstaecker, the species with which 

 it is most readily confused in the field. 



