COMPLETE HAIG: EASTERN PACIFIC PORCELLANIDAE 85 



and gaping. Gape with a thick, fine pubescence, extending nearly to 

 tip of fingers, completely filling gape but not produced into a tuft. 



Walking legs finely granulate or punctate. Merus unarmed, with 

 long scattered setae near posterior margin and a few on dorsal surface 

 and anterior margin, that of leg 3 not inflated ; carpus, propodus and 

 dactylus thickly covered with long and short scattered setae. 



Measurements: Holotype male: length 10.2 mm, width 10.1 mm. 

 Paratypes: males, 4.0 to 8.9 mm; non-ovigerous females, 3.9 to 7.0 

 mm ; ovigerous females, 4.4 to 7.2 mm. The specimen recorded by 

 Boone (1932) as Petrolisthes eriomerus was reported to be 13 mm in 

 length. 



Color: No trace of color remained on any of the specimens exam- 

 ined. 



Ecology: Hancock Expeditions specimens were taken in the inter- 

 tidal zone under stones, where they were frequently found with Pet- 

 rolisthes tonsorius, new species. The specimen reported by Boone from 

 the Arcturus Expedition was recovered in 2^ fathoms from a coral 

 rock bottom. 



Ovigerous females were collected in December, January, and Feb- 

 ruary. 



Remarks: The specimen reported by Boone (1932) as Petrolisthes 

 eriomerus Stimpson was not examined by the writer, but may readily 

 be identified with P. galapagensis from the accompanying photograph. 



Range: Known only from the Galapagos Archipelago, at Islas Albe- 

 marle, Bartolome, James, Indefatigable, Charles, and Hood. 



Petrolisthes tonsorius, new species 

 Plate 3 ; plate 26, fig. 1 



Petrolisthes cinctipes, Boone, 1932, p. 49, text-fig. 15. Not P. cinctipes 



(Randall). 

 Petrolisthes near cinctipes, Schmitt, 1939, p. 11. 



Previous records: 

 Mexico. Bahia de Braithwaite, Isla Socorro: Presidential Cruise of 



1938 (Schmitt). 

 Galapagos Islands. Bahia de Gardner, Isla Hood: W. Beebe on 

 Arcturus (Boone). 



Types: Holotype, male, U. S. National Museum Cat. No. 102404, 

 from south of Cabo Berkeley, Isla Albemarle, Galapagos Islands, rocky 



