FAMILY SCOMBRIDAE — SCHULTZ 415 



tip of snout to rear of maxillary 2.5 to 2.6; interorbital space 2.8 to 

 3.2; length of pectoral fin 1.0 to 1.1; longest (first) dorsal spine 2.3 

 to 2.4; longest soft dorsal ray 2.4, soft anal ray 2.3 to 3.2; longest 

 pelvic ray 3.0; all in length of the head to rear edge of fleshy operculum. 



Body fusiform, skin with very fine scales, head naked; teeth in both 

 jaws small, conical, somewhat hooked inward; vomer with a patch of 

 villiform teeth, those of palatines in a narrow row; tongue naked, 

 with a low cutaneous fold on each side, space between concave; 

 lateral line running a slanting, even course from above pectoral to 

 midside of caudal peduncle; posterior margin of preopercle truncate 

 with lower corner rounded; maxillary reaches to about opposite front 

 of pupil; interorbital space strongly convex; diameter of eye along 

 lengthwise axis of body 5 to 6}^ times in length of pectoral fin and 

 2.0 to 5.8 in maxillaries. 



Color in alcohol. — Back and upper sides dark bluish or black, lower 

 sides dusky to whitish; numerous more oi* less distinct, narrow, pale, 

 slightly oblique lines or a series of white dots. 



Color when alive.— Eye yellow, spiny dorsal grayish yellow; soft 

 dorsal and anal and all finlets bright yellow ; inside of pectorals black, 

 outer side blackish tinged with yellow; pel vies yellowish, tipped with 

 blackish. 



Genus EUTHYNNUS Lutken 



Euthynnus LUtken, in Jordan and Gilbert, U. S. Nat. Mus. Bull. 16, p. 429, 

 1882 (type species, Thynnus thunnina Cuvier and Valenciennes) . 



EUTHYNNUS AFFINIS YAITO Eishinonye 



Plate 123,C 



Euthynnus yaito Kishinouye, Suisan Gakkwai Ho (Proc. Sci. Fish. Assoc.) vol. 

 1, p. 22, pi. 1, fig. 15, 1915 (Japan). 



SPECIMENS STUDIED 



Bikini Atoll: Lagoon and Enyu Channel, trolling, March 11-31, S-46-2, 

 Brock, Marr, and Schultz, 1 specimen USNM 140981, 350 mm. to fork of tail, 

 a female bulging with mature eggs; lagoon and channels on leeward side, April 

 1-24, S-46-72, crew of U. S. S. Bowditch and Schultz, 2 specimens USNM 140982, 

 355 and 520 mm.; western half of lagoon, troUing, April 13, S-46-93, Schultz, 2 

 specimens USNM 140983, 360 and 550 mm. 



In addition we have discarded several specimens in various stages of disinte- 

 gration rescued from the ship wrecked in Half moon Bay, Calif, (see vol. 1, p. 

 xxi), but saved a few dried ones useful for skeletons; these bear the number 

 USNM 111429. 



Description.— BoTs&l rays XV-III,8 or 9-8; anal 111,10-7; pectoral 

 ii,26 or 27; pelvic 1,5; gill rakers on first gill arch about 7 or 8+1+24 

 or 25; greatest depth 3.8 to 4.0; length of head 3.6 to 3.7; length of 

 pectoral fin 6.0 to 6.3; length of base of first dorsal 3.9 to 4.1; snout 



