234 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



Range: Pacific Ocean from Santa Catalina Island, California, to 

 Punta Entrada, Lower California; Guadalupe Island; and Gulf of 

 California from Punta Cholla, Sonora, to Maria Magdalena Island, 

 Mexico; Gorgona Island, Colombia; La Plata Island, Ecuador. Atlantic 

 Ocean: Florida, exact locality unknown. Shore to 13 fathoms. 



Key to the Pacific American Species of Epialtoides 

 (Males with five free abdominal somites) 



la. Posterior third of carapace eroded; anterior margins of hepatic 



lobes horizontal and minutely dentate .... murphyi 



lb. Posterior third of carapace smooth; anterior margins of hepatic 



lobes inclining forward and entire 



2a. Hepatic lobes directed strongly outward; male chelipeds 



massive paradigmus 



2b. Hepatic lobes directed obliquely forward ; male chelipeds of 

 moderate size hiltoni 



Epialtoides hiltoni (Rathbun), new combination 

 Plate O, Fig. 7 ; Plate 26, Fig. 3 



Epialtus bituberculatus, Rathbun, 1894, p. 67; 1904, p. 173 (part) ; 

 1910, p. 571 (part). Weymouth, 1910, p. 28. Nininger, 1918, p. 39, 

 fig. 15. Schmitt, 1921, p. 203 (the California specimen), not text- 

 fig. 126. (Not E. bituberculatus Milne Edwards.) 

 Epialtus bituberculatus forma minima, Hilton, 1916, p. 69, fig. 17. (Not 



E. bituberculatus Milne Edwards; not E. minimus Lockington.) 

 Epialtus hiltoni Rathbun, 1923a, p. 72; 1925, p. 156, pi. 46, figs. 1, 2; 

 text-figs. 53m, n. 



Type: Male holotype, U.S.N.M. No. 50599, length 14 mm, hepatic 

 width 12.2 mm, branchial width 12.4 mm. 



Type locality: Laguna Beach, California, William A. Hilton, col- 

 lector. 



Localities subsequently recorded, with collectors: California: Catalina 

 Harbor, Santa Catalina Island, W. H. Dall (Rathbun, 1894, as 

 Epialtus bituberculatus) ; Laguna Beach, William A. Hilton (Rathbun, 

 1925 ; Hilton, 1916, as E. bituberculatus forma minima). 



Diagnosis: Rostrum oblong, tip bilobed. Hepatic lobe broad, ad- 

 vanced, a tooth on anterior margin ; branchial lobe narrow, acute. Pre- 

 orbital tooth outstanding, postorbital tooth inconspicuous. Manus of 

 male elongate, usually with a superior tubercle, fingers short, deflexed. 

 Male first pleopod with convex margin sharply angled below opening, 

 concave margin bordered with setae, tip slender, pointed. 



