74. SCOMBRID.^: SCOMBEHOMORUS. 
425 
the jaws equal. Teeth very small, mostly in a single series, on the jaws 
only. Tail very slender, depressed, with a rather large keel on each 
side. First dorsal short, separated from the second hy a considerable 
interspace. Second dorsal and anal small, each with 7 or 8 fiulets. 
Pectorals and veutrals small. No air-bladder. Branchiostegals 7. 
Pyloric coeca dendritical. Gill-rakers very long and slender, numerous. 
Vertebrae xjcculiarly modified, essentially as in Euthymius. an 
ancient name of a young tunny, from aZ^iu, to grow.) 
009. A. rocSiei (Risso) Giiuther. — Frigate Maclcerel. 
Blue, variegated with darker above, becoming i)lain with age ; belly 
silvery. Body robust, scarcely compressed, abruptly contracted at cau- 
dal peduncle. Eye as long as snout, 5 in head. Oi^ercle very broad. 
Scales of corselet and along anterior dorsal region comparatively large. 
Maxillary almost entirely concealed by preorbital. Dorsal spines rather 
stiff; space between dorsals four-fifths length of head. About 33 gill- 
rakers below angle. Pectoral reaching past middle of first dorsal. Head 
4; depth 4;^. D. X-12-VIII; A. 13-YII. Vert. 39. Mediterranean to 
the East Indies ; lately appearing in great numbers on our Atlantic 
coast. A food-fish of little value. 
(Scomber rochci Risso, Iclith. Nice, 1810, 105; Giintlier, ii, 869: Scomber' bisus Rafiu- 
esque, Caratteri, etc. I8l0, 45: Auxis vulgaris Cuv. & Val. viii, 139.) 
215.— SCOMBEISOMORUS Lacdpede. 
(Cgbium Cuvier.) 
(Lac6j)ede, Hist. Nat. Poiss. iii, 292, 1802: tyiie Scomberomorus plumierii 1^0,0. = Scom- 
ber regalis Bloch. ) 
Body elongate, naked or with rudimentary scales, which do not form 
a distinct corselet. Head iiointed, comi)aratively short and small. 
Mouth wide, the strong teeth in the jaws often compressed or knife- 
shaped; villiform or sand-like teeth on the vomer and palatines; max- 
illary not concealed by preorbital. Spinous dorsal low, of 14-18 feeble 
spines. Soft dorsal and anal short, similar, somewhat elevated and 
falcate, each followed by 7 to 10 finlets; ventrals small; pectorals moder- 
ate, near the level of the eye. Air-bladder present. Vertebrae normal. 
Fishes of the high seas; graceful iu form and beautiful in color; among 
the best of food-fishes. Scomber; opjipoi;, near.) 
670. S. coeacoBor (Lockingtou) J. & G. 
Male dark steel-blue, the sides silvery, without streaks or spots; 
female with two alternate series of brown si>ots, the silvery on sides 
