90 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



legs with patterns and striations light tan to dark brown, propodus with 

 a broad center band of yellowish tan ; dactyl with center band of dark 

 brown, tip bright purple, general appearance dark dusky green. Ven- 

 tral side pale dull yellow with darker patterns on abdomen." (Glassell, 

 1945, from notes by Petersen on a live specimen) 



Ecology: "Occupies the midtidal zone under shelter of rocks and 

 is more tolerant of sand and muddy water than any of the other Cali- 

 fornia species of this genus." (Glassell) It may occasionally be found 

 on wharf pilings or seeking shelter in mussel beds. 



Ovigerous females are recorded for February, April, May, October, 

 and November. 



Remarks: Lockington's (1878) record of Petrolisthes ruptcolus 

 from Isla Asuncion, Baja California, was probably based on material 

 of P. cabrilloi; the same is probably true of Holmes's (1900) records 

 of P. cinctipes from Santa Catalina Island and San Diego, California. 

 Baker (1912) reported P. cinctipes from Laguna Beach, a record re- 

 peated by Hilton (1916); specimens on which this record may have 

 been based were seen by the writer in the U. S. National Museum and 

 identified as P. cabrilloi. 



Glassell's spelling cabrilloa is hereby emended to cabrilloi to con- 

 form with the rules of the International Commission of Zoological 

 Nomenclature for the formation of specific names based on modern 

 surnames. 



Range: Morro Bay, California, south to Bahia de la Magdalena, 

 Baja California; Santa Cruz and Santa Catalina Islands off the Cali- 

 fornia coast. 



Petrolisthes cinctipes (Randall) 

 Plate 28, fig. 3 



Porcellana cinctipes Randall, 1839, p. 136 (type locality. Sandwich 

 [Hawaiian] Islands, in error for western America). 



Porcellana rupicola Stimpson, 1857a, p. 85 (type locality, coast of 

 California) ; 1857b, p. 480, pi. 20 (not pi. 19 as stated in text), 

 fig. 2 (type localities restricted to Farallones, San Luis Obispo, 

 and Monterey, California). Lockington, 1874, p. 383. Boas, 1880, 

 pp. 127, 196, pi. 2, fig. 62; pi. 3, fig. 93. 



Petrolisthes rtipicoliis, Stimpson, 1858, p. 227. Lockington, 1878, pp. 

 395, 396 (part). Newcombe, 1893, p. 30 (part). 



[Petrolisthes] cinctipes f, Stimpson, 1858, p. 228. 



