446 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 5 



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



1934, 1 female. 

 333-35. James Bay, James Island, shore, Dec. 11, 1934, 7 specimens. 

 343-35. Sulivan Bay, James Island, shore, Dec. 12, 1934, 2 males, 2 



ovig. females. 

 354-35. Wreck Bay, Chatham Island, shore, Dec. 15, 1934, fragment. 

 782-38. Darwin Bay, Tower Island, shore, Jan. 16, 1938, 1 male. 

 796-38. Sulivan Bay, James Island, shore, Jan. 21, 1938, 3 males. 

 800-38. Cartago Bay, Albemarle Island, shore, Jan. 22, 1938, 1 male. 

 811-38. Barrington Island, coral, Jan. 26, 1938, 2 males, 1 female, 2 

 young. 

 811a-38. Barrington Island, Pavona coral, Jan. 26, 1938, 1 young male. 

 Measurements. — Largest specimen, male: length 16.3 mm, width 

 21.6 mm, cheliped 23.0 mm, chela 12.8 mm, dactyl 7.0 mm. 



Color in life. — Carapace white overcast with tiny pale orange to red 

 spots more intense in grooves separating areolations and more numerous 

 on gastric and intestinal regions. Cheliped white, fingers dull clay color. 

 Ambulatory legs white. Eyestalks streaked with pale orange, eye very 

 light. (Petersen) A young specimen: carapace grayish olive with laven- 

 der tint. Chelae show more lavender. Fingers yellowish dusky drab. 

 (Garth) 



Habitat. — In coarse gravel at high tide level ; larger individuals under 

 rocks at low tide level. 



Depth. — Shore ; occasionally to 30 fms. 



Remarks. — Small specimens of the "Cameo Crab," as C. vittatus is 

 called^ were encountered in coarse gravel near the high tide line in 

 company with Leptodius cooksoni Miers and Lophoxanthus lamellipes 

 (Stimpson). Larger individuals were found among the bright coralline- 

 and bryozoan-encrusted rocks of the low tide level. In each case the crab 

 matched the coloration of its surroundings. 



Genus LEPTODIUS A. Milne Edwards, 1863 

 Key to the Galapagos Species of the Genus Leptodius 



A^ Anterolateral margins of carapace thick and lobed L. cooksoni 



A^ Anterolateral margins of carapace thin and denticulate 



B^ Hand with external transverse ridges . L. snodgrassi 

 B^ Hand without external transverse ridges . L. occidentalis 



Leptodius occidentalis (Stimpson) 



Chlorodius occidentalis Stimpson, Ann. Lye. Nat. Hist. New York, vol. 

 10,p. 108, 1871. 



