414 tr.S. NATIONAL MUSEUM BULLETIN 202 Vol. 2 



snout 3.5; tip of snout to rear of maxillary 2.7; interorbital space 3.9 

 length of pectoral fin 2.2; longest (first or second) dorsal spine 2.2 

 longest soft dorsal ray 3.9, soft anal ray 4.1; longest pelvic ray 2.5 

 all in length of head to rear edge of fleshy operculum. 



Body fusiform, skin smooth, naked except for corselet, which 

 occurs on breast, around pectoral fin to spiny dorsal, thence to front 

 of soft dorsal; teeth in jaws small numerous, hooked inward; vomer 

 toothless; palatines with tiny teeth in a single row or a very narrow 

 band; tongue toothless, with a low cutaneous fold on each side, 

 space between concave; lateral line arched and curving to midlength- 

 wise axis of body opposite base of soft dorsal; margin of preopercle 

 rounded; maxillary reaches nearly to opposite front of pupil; inter- 

 orbital space strongly convex; diameter of eye 3.0 in pectoral fin and 

 2.5 in maxillaries. 



Color in alcohol. — Back bluish black, with some light-colored 

 vertical bars; lower sides silvery with a few lengthwise dark streaks 

 or bands slanting dorsally towards caudal peduncle. 



Genus NEOTHUNNUS Kishinouye 



Neotkunnus Kishinouye, Journ. Coll. Agr. Imp. Univ., Tokj'o, vol. 8, No. 3, 

 p. 445, 1923 (type species, Thynnus macropterus Temminck and Schlegel). 



NEOTHUNNUS ALBACORA MACROPTERUS (Temminck and Schlegel) 



Plate 122,A 



Thynnus albacora Lowe, Proc. Zool. Soc. London, p. 77, 1839 (Madeira). 

 Thynnus macropterus Temminck and Schlegel, Fauna Japonica, pt. 3, p.] 98, 

 pi. 51, 1844 (type locality, Nagasaki). 



; SPECIMENS STUDIED 



Tropical North Pacific Ocean, lat. 20°17'45" N., long. 162°28'45" W., March 

 2, 1946, S-46-1, commercial fishermen on U.S.S. Bowditch, 1 specimen USNM 

 140984, 450 mm. to fork of caudal fin, or "crutch." 



Bikini Atoll, Lagoon and leeward channels, April 1-24, S-46-72 crew of U.S.S. 

 Bowditch and Schultz, 1 specimen USNM 140985, 600 mm. 



Marianas Islands, Rota Island, November 15, 1945, Frey, 1 specimen USNM 

 139875, 610 mm. 



A few specimens were rescued from the ship wrecked in Halfmoon Bay, Calif., 

 (see vol. 1, p. xxi). Most were discarded in various stages of disintegration, but 

 several, useful for skeletons, were saved and these bear the number USNM 

 111430. 



Description.—Dorsal rays XIII-111,11 or 12-9; anal 111,10-8; 

 pectoral ii,33 to 35; pelvic 1,5; gill rakers on first gill arch 8 + 1+21 

 or 22. Greatest depth 4.0 to 4.3; length of head 3.6 to 3.7; length of 

 pectoral fin 3.5 to 3.8; length of base of first dorsal fin 4.4 to 4.5; 

 snout tip to soft dorsal origin 1.7 to 1.8; all in length from tip of snout 

 to fork of caudal fin, or "crutch." Eye 5.6 to 6.7; snout 3.0 to 3.1; 



