104 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL. 24 



Ecology: All Hancock Foundation material was taken under rocks 

 in the littoral. Ovigerous females were taken in January, February, 

 and March. 



Remarks: Until recently, the species was known only from the three 

 type specimens collected by Enrico Festa at Isla Flamenco, Panama, 

 and reported by Nobili. Haig (1957b) reported one additional speci- 

 men from Isla Pacheca, Islas de las Perlas, taken by the Askoy Ex- 

 pedition in 1941. Specimens collected in 1934 and 1935 by the Velero 

 III, and in 1937 by Woodbridge Williams, show that it is distributed 

 throughout a large part of the Panamic Province. 



Range: Bahia de Salinas, Costa Rica, south to La Libertad, 

 Ecuador. 



Petrolisthes schmitti Glassell 

 Plate 29, fig. 1 



?Petrolisthes rupicolus, Lockington, 1878, pp. 395, 396 (part). Not 

 P. rupicolus (Stimpson) = P. cinctipes (Randall). 



Petrolisthes schmitti Glassell, 1936, p. 280 (type locality, San Fe- 

 lipe, Gulf of California) ; 1938a, p. 444. 



Previous records: Gulf of California. San Felipe: S. A. Glassell 

 (Glassell 1936). Bahia de las Animas; Puerto Escondido: Fisher 

 (Lockington) [probably this species]. 



Diagnosis: Carapace finely granular, regions distinct; no epibran- 

 chial spine; front sinuously triangular; carpus less than twice as long 

 as wide, anterior margin with enlarged granules or spinules, margins 

 slightly converging distally ; manus somewhat swollen on dorsal surface, 

 outer margin with a crest defined by a distinct groove ; merus of walk- 

 ing legs unarmed. 



Description: Carapace finely and evenly granular, regions distinct. 

 Front sinuously triangular, with a deep median groove extending to be- 

 tween protogastric lobes; no supraocular spine; inner orbital angle pro- 

 duced into a small, narrow, rounded lobe, sometimes quite strongly 

 projecting. Outer orbital angle only slightly produced. No epibran- 

 chial spine. Carapace lightly pubescent. 



First movable segment of antenna with a strongly projecting, gran- 

 ular lobe on anterior margin; second and third roughly granular; fla- 

 gellum with vestigial hairs visible only under magnification. Outer 

 maxillipeds lightly rugose. 



Chelipeds covered with small, rough granules, naked or with a fine 

 pubescence. Merus with a strongly projecting, distally directed, pointed 



