18 ALLAN HANCOCK ATLANTIC EXPEDITION REPORT 



Petrolisthes quadratus Benedict 



Petrolisthes quadratus Benedict, 1901, p. 134, pi. 3, figs. 4, 4a (type 

 locality. Ponce, Puerto Rico). Schmitt, 1924a, p. 73; 1935, pp. 

 185, 187. 

 ^Petrolisthes near quadratus Schmitt, 1939, p. 28. 



Previous records. — 

 Puerto Rico, Ponce: Fish Hawk (Benedict). ? Isla Vieja Providencia: 

 Presidential Cruise of 1938 (Schmitt, 1939). Curagao: C. J. van der 

 Horet (Schmitt, 1942a). 



Material examined. — 

 A50-39. Bahia Caledonia, Panama; Apr 26, 1939; shore. l$ov. 

 A16-39. Punt Basora, Aruba: Apr 10, 1939; shore. 2cf , 1?, 1 young. 

 A46-39. Vista Alegre, Curagao ; Apr 23, 1939 ; shore. 1?. 

 A30-39. Isla Cubagua, Venezuela; Apr 15, 1939; shore. l?ov. 



Measurements. — Males, 3.9 and 4.0 mm; non-ovigerous females, 

 4.2 and 4.5 mm ; ovigerous females, 3.7 and 7.4 mm ; young, 2.9 mm. 



Remarks. — Known from the littoral. The female from Bahia 

 Caledonia differs from the rest of the material examined in having a 

 brush of pubescence on the outer surface of the left hand. The right 

 cheliped is missing. 



Petrolisthes tridentatus Stimpson 



Petrolisthes tridentatus Stimpson, 1858, p. 227 {nomcn nudum) ; 1859, 

 p. 75, pi. 1, fig. 4 (type locality, Barbados). Rankin, 1898, p. 

 238. Young, 1900, p. 394. Benedict, 1901, p. 134, pi. 3, fig. 2. 

 A. Milne Edwards and Bouvier, 1923, p. 291. Schmitt, 1924b, 

 p. 88; 1935, pp. 185, 187, text-fig. 47; 1939, p. 28. 

 Previous records. — 

 Bahamas, New Providence Island and Salt Cay: Northrop (Rankin). 

 St. Thomas: A. H. Riise (Stimpson, 1859) ; (A. Milne Edwards and 

 Bouvier). Antigua: Univ. Iowa Barbados-Antigua Exped. (Schmitt, 

 1924b). Barbados: T. Gill (Stimpson, 1859); Univ. Iowa Barbados- 

 Antigua Exped, (Schmitt, 1924b). Trinidad: (Benedict). Isla Vieja 

 Providencia: Presidential Cruise of 1938 (Schmitt, 1939). 



Material examined. — 

 A50-39. Bahia Caledonia, Panama; Apr 26, 1939; shore. l?ov. 

 A25-39. Isla Cubagua, Venezuela; Apr 14, 1939; shore. 1?. 

 A30-39. Isla Cubagua, Venezuela; Apr 15, 1939; shore, l^. 



Measurements. — Male, 6.5 mm; female, 3.9 mm; ovigerous female, 

 4.1 mm. 



