94 Memoir Sears Foundation for Marine Research 



Key to Species^" 



I a. Margins of rear parts of pectorals with two rows of small papillae, partly spinous. 



mackayana Metzelaar 191 9. 

 Tropical West Africa. 

 lb. Margins of rear parts of pectorals without spinous papillae, the skin naked there, 

 as elsewhere. 



2 a. Rear end of base of first dorsal considerably posterior to rear ends of pelvic 

 fin bases. 



3 a. Dorsal surface of disc with five (occasionally one, three, or seven) large 

 and conspicuous blue-centered and pale-ringed ocelli, symmetrically 

 arranged. /or/)efrt'o (Linnaeus) 1758. 



Eastern Atlantic and Mediter- 

 ranean. 

 3 b. Dorsal surface of disc without conspicuous ocelli though sometimes 

 otherwise blotched or spotted. 

 4a. Margins of spiracles smooth. 



5 a. Disc about as broad as long. tokionis (Tanaka) 1908. 



Japan. 

 5 b. Disc appreciably shorter (less than 80 "/q) than its breadth. 

 6 a. Height of caudal fin not greater than distance from its own 

 upper origin to origin of first dorsal. 

 7a. Interspace between second dorsal and caudal little 

 longer than base of first dorsal. 



8 a. Caudal, from upper origin to midpoint of rear 

 margin, nearly or quite as long as distance from 

 its own origin to origin of first dorsal. 



nohiliana Bonaparte 1835, P- 9^- 

 8 b. Caudal, from upper origin to midpoint of rear 

 margin, only about as long as distance from its 

 own origin to rear end of base of first dorsal. 

 torpedo (Linnaeus) 1758. 

 Eastern Atlantic, Mediterranean. ^^ 

 7b. Interspace between second dorsal and caudal about 1.5 

 times as long as base of first dorsal. 



puelcha Lahille 1928. 



Argentina.*^ 



6 b. Caudal higher than distance from its own upper origin to 



origin of first dorsal by an amount about equal to length 



of base of first dorsal. 



9a. Distance between inner ends of nostrils about half as 



60. Based in part on Key by Fraser-Brunner (Ann. Mag. nat. Hist., [12] 2, 1949: 944) to species with papillate spiracles. 



61. Occasional adult specimens may be plain-colored and the spiracular knobs may be visible no longer. 



62. P'or full account with measurements and illustrations, see Lahille (An. Mus. nac. B.Aires, 34, 1928: 332, pi. 5). 



