FAMILY SCOMBRIDAE — SCHULTZ 413 



was not possible to compare A. cybium with A. forbesi Seale from the Philippines 

 and determine if it represents another species. 



Marianas Islands, Rota Island, off Sosan Isthmus, October 1945, Markley, 

 1 specimen, USNM 123740, 930 mm. 



Description. — (Rota Island specimen): Dorsal rays XXIV,III,8-9; 

 anal 111,8-9; pectoral ii,20; pelvics 1,5; gill rakers on first gill arch 

 undeveloped. 



Greatest depth 6.7; length of head 4.6; length of pectoral fin 9.7; 

 length of base of first dorsal 2.8; snout tip to soft dorsal origin 1.6; 

 all in length from tip of snout to fork of caudal fin, or "crutch." Eye 

 9.2; snout 2.0; tip of snout to rear of maxillary 2.0; interorbital space 

 3.8; length of pectoral fin 2.2; longest dorsal (second) spine 3.3; 

 longest soft ray of dorsal 4.5; and of anal 4.5; longest pelvic ray 3.8; 

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



Body greatly elongate, fusiform, skin with extremely minute scales, 

 corselet around pectoral fin and on back; both jaws with strong, close- 

 set triangular teeth; vomer and palatines each with an elongate patch 

 of villiform teeth; tongue flat, broad, without teeth; lateral line single, 

 abruptly decurved behind pectoral fin, thence extending along mid- 

 axis of body in a more or less wavy course; dorsal spines not abruptly 

 shorter posteriorly; the second or longest is only a little longer than 

 sixth from last; posterior margin of preopercle truncate and coarsely 

 fringed; maxillary reaches to under front of eye; interorbital strongly 

 convex; diameter of eye along the lengthwise axis of body 4.0 in the 

 length of pectoral fin and 4.7 in length of maxillaries. 



Color in alcohol. — Back blackish to bluish black ; sides with numerous 

 pale or whitish vertical bars, fading dorsally. 



Genus KATSUWONUS Kishinouye 



Katsuwonus Kishinouye, Suisan Gakkwai Ho (Proc. Sci. Fish. Assoc.) vol. 1, 

 p. 21, 1915 (type species, Scomber pelamis Linnaeus). 



KATSUWONUS PELAMIS (Linnaeus) 



Plate 122,B 



Scomber pelamis Linnaeus, Systema naturae, ed. 10, p. 297, 1758 (type locality, 



tropical seas). 



SPECIMENS STUDIED 



Although numerous specimens of this species were taken, all but one were lost 

 in the ship wrecked in Halfmoon Bay, Calif. (See vol. 1, p. xxi), and that speci- 

 men was so badly disintegrated that it was destroyed. 



Description. — (Based on a specimen from Japan) : Dorsal rays 

 XV,III,12-8; anal 111,12-7; pectoral ii,26; pelvics 1,5; gill rakers on 

 first gill arch 18+1 + 37. Greatest depth 4.0; length of head 3.7; 

 length of pectoral fin 8.0; length of base of first dorsal fin 4.0; snout 

 tip to soft dorsal origin 1.7; all in length to fork of tail. Eye 6.5; 



