440 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



1815, 383: Argyriosus vomer Giiutbcr, ii, 458'i Selene argenfea Lac^pfede, iv, 560: 

 Argyreinsiis pacijicus Lockington, Proc. Cal. Acad. Nat. Sci. 1876 : Selene argentea (adult) 

 and Argyriosus vomer (partly grown) of most recent writers. Liitkeu, Spolia Atlantica, 

 1880, 547, in which memoir the stages of growth of this and other species are fully 

 described.) 



aa. All the fins very low, none of the rays produced or filamentous in the adult. ( Vo- 

 mer* Ouvier.) 



0i>4. S. setipiaiMBS (Milch.) Liitkeu. — Rorsc Fish. 



Greenish above, below golden or silvery. Young with a black blotch 

 at origin of straight part of lateral line. Body oblong, rhombic, less 

 elevated than in the other species ; profile anteriorly nearly vertical, 

 highest above the eye, snout somewhat protruding, belly most arched 

 in the young ; mouth oblique ; maxillary reaching vertical from front of 

 orbit. Ventral fins minute; dorsal and anal very low, esijecially in the 

 adult, the long rays disappearing very early; pectorals falcate, about as 

 long as head. Head 3^ in length; depth 1|. D. YIII-I, 21; A. II-I, 

 17. Tropical America, north to Cape Cod ; not very common on our 

 coasts. 



(Zeus setajnnnis Mitch. Trans. Lit. & Phil. Soc. N. Y. 1815, 384 : Argyreiosus setipin- 

 nis Giiuther, ii, 459 : Vomer hrowni Cuv. & Val. ix, 189 : Vomer browni Dekay, New York 

 Fauna, Fish. 127; Liitkeu, Spolia Atlantica, 1880, 543: Vomer curtus Cope, Proc. Acad. 

 Nat. Sci. Phila. 1870, 119: A7-gy7'tiosus miimaculalus Batchelder.) 



224.— CHLOKOSCOMBRUS Girard. 

 {Micropteryx Agassiz, preoccupied.) 



(Girard, Proc. Acad. Nat. Sci. Phila. 1858, 168: type Seriola cosmopoUta Cuv. & Val. 

 = Scomber chrysurus L. ) 



Body oblong ovate, closely compressed, but not elevated ; the abdomen 

 prominent anteriorly, its curve being much greater than the curve of the 

 back. Occiput and thoracic region trenchant. Caudal peduncle very 

 narrow, the fin widely forked. Scales small, smooth. Lateral line arched 

 in front, unarmed. Head nearly naked. Preorbital low. Mouth rather 

 small, oblique, lower jaw scarcely projecting; upper jaw protractile; 

 maxillary broad, emarginate behind, with a large sui)plemental bone. 

 Jaws, vomer, and palatines with feeble teeth, mostly in single series. 

 First dorsal of feeble spines, connected by membrane; second dorsal 

 and anal long and low, similar, much longer than the short abdomen. 

 No finlets. Anal spines strong. Ventrals small; jjectorals falcate. 

 Gill-rakers long. {'/XiDpn<;j green ; ay.oiifipoq, mackerel.) 



* Cuvier, Regue Anim. ii, 1817: type Vomer hrowni Cuv. ^^Zeus selipinuis Mitchill: 

 (Latin vomer, a plowshare.) 



