part 1 garth: pacific oxyrhyncha 231 



E. crenulatus from E. minimus are in part to be attributed to sex: length 

 of rostrum with resultant prehepatic length, and size of chelipeds. When 

 those characters not associated with sex are considered (horizontal 

 anterior margin of hepatic lobes, size of hepatic lobe in excess of branchial, 

 and possession of tufts of setae on inferior margins of walking legs), the 

 two agree remarkably well. For this reason, and after examination of 

 photographs of the unique female holotype of E. crenulatus (U.S.N.M. 

 No. 18135) provided by Fenner A. Chace, Jr., of the U.S. National 

 Museum, the writer considers E. crenulatus Rathbun a synonym of E. 

 minimus Lockington. Any remaining doubt should be dispelled by com- 

 paring the outline figure of Rathbun with the aforementioned figure of 

 Crane, and particularly with the third specimen from the bottom in the 

 middle row. 



While none of the Zaca males had a prehepatic length greater than 

 the posthepatic, as shown by Kingsley's figure of a cotype (Rathbun, 

 1925, text-fig. 57), several of the series at hand have a rostrum pro- 

 portionately as long as, if not longer than that of the figured specimen. 

 In one of these from Espiritu Santo Island, station 510-36, the tips of 

 the rostrum diverge in a strong Y. Waldo L. Schmitt, who examined 

 this specimen, believed it to represent a new species, but in all other 

 particulars except the rostrum it is typical Epialtus minimus. A male 

 specimen without chelipeds from Acapulco, collected by E. Yale Daw- 

 son, also has a very long rostrum, slender throughout its length, but 

 without the terminal flare of the Espiritu Santo specimen. 



The presence of Epialtus minimus outside the Gulf of California, 

 as at Lagoon Head on the west coast of Lower California, at Tenacatita 

 Bay, Jalisco, and at Acapulco, Guerrero, needs confirmation by a series 

 of more nearly typical individuals from these extralimital localities. 



Epialtus sulcirostris Stimpson 

 Plate O, Fig. 6 ; Plate 26, Fig. 2 



Epialtus sulcirostris Stimpson, 1860b, p. 198. A. Milne Edwards, 1878, 

 p. 141, pi. 27, figs. 6-6b. Rathbun, 1923b, p. 634; 1924c, p. 377; 

 1925, p. 150, pi. 46, fig. 3; pi. 47, fig. 2, text-fig. 53c. 



Type: Male cotype in Paris Museum. 



Type locality: Cape San Lucas, Lower California, Mexico, John 

 Xantus, collector. 



Localities subsequently reported, with collectors: Lower California, 

 Mexico: Santa Maria Bay, with boat dredge, Albatross (Rathbun, 

 1923b) ; Gulf of California: San Marcos Island, Johnson and Baker 

 (Rathbun, 1924c). 



