1420 Dullethi 47, United States National Museinn. 



notably enlarged; dorsal spines slender, the highest 2f in head; pectoral 

 If in head; ventrals If; scales all ctenoid. Color grayish above, silvery 

 below; upper vertical fins punctate; lower fins yellowish; axil dark. 

 (Steiudachner.) Kivers of Guiana, Venezuela, and Colombia; not seen 

 by us. 



Pseudoscicvna surinainemig, Bleeker, Arch. Neeil. Sci. Exact, et Nat., vni, 1873, 458, 



Surinam. 

 Scuv7ia tiiagdalena; Steindaciiner, Zur FischFauna de.s MagdalencnStromes, 6, ]878, 



Magdalena Bay, Venezuela. 

 Scimna survnaiiiensis, Steind.\chneh, Fiacli-rauna ties Cauca, 4, 1880. 



576. LARIMUS, Cuvier & Valenciennes. 



Larimns, Cuvier & Valenciennes, Hist. Nat. Poias., v, 145, 1830 (hrevieeps). 

 Amblyscion, Gill, Proc. Ac. Nat. Sci. Phila. 1863, 165 (argenteus). 

 Monosira, Poey, Analea do Hist. Nat. Esp. 1881, 326 (stahli). 



Body rather elongate, compressed; skull firm, not greatly cavernous; 

 interorbital space rather narrow; preorbital flattish, not turgid; upper 

 jaw with the usual slits and pores little developed; no barbels; no canines; 

 snout very short, mouth large, terminal, very oblique or even vertical, the 

 lower jaw projecting; teeth minute, equal, uniserial or partly biserial 

 above; preopercle entire or nearly so, without bony teeth. Scales mod- 

 erate, subequal. r8eudol)ranchi;e well developed. Fins essentially as in 

 Bairdiella, the second dorsal long, the anal short, its spines moderate or 

 small; fins not thickened by accessory scales. Gill rakers long and slen- 

 der. Vertebne 10-|-14. Silvery fishes, all American. (Larimus, a name 

 used by Oppien for some fish, "sans signification precise.") 



(Amblyscion dfi(3Aus, blunt; trKiov, Scicuna.): 

 a. Moutli large, the cleft «iuite vertical ; profile slightly convex, nearly horizontal ; no 

 traces of dark stripes along the rows of scales ; maxillary not extending beyond 

 anterior margin of pupil, 2 in head; snout very short, 5J in head; ventrals a 

 little shorter than pectorals which are as long as head. D. X-I, 27; A. II, 6. 



ARGENTEUS, 1800. 

 LaRIMUS : 



aa. Mouth more or less oblique, not quite vertical ; upper part.s with dark streaks along 

 the rows of scales ; profile slightly convex, a little oblique ; maxillary extending 

 to below front of orbit, 2 in head. 

 b. Dorsal rays 27 to 30; mouth notably oblique. 



c. Upper parts silvery, without dark streaks or cross bands; pectorals long 

 and narrow, jV longer than head. D. X-I, 28 to 30. 



EFFULGENS, 1801. 



cc. Upper parts with distinct dark streaks alonj; the rows of scales. 



d. Second anal spine 1| to 2J in head, not reaching tips of soft rays; 



dark streaks very distinct ; mouth less oblique ; gill cavity largely 



black. ACCLivis, 1802. 



dd. Second anal spine If in head, reaching tips of soft rays ; dark streaks 



on sides not very distinct; mouth very oblique ; gill cavity pale. 



BKEVICEPS, 1803. 



66. Dorsal rays 24 to 27; mouth still less oblique, the snout more convex, the pro- 

 file descending forward. 

 e. Color silvery, with more or less distinct streaks along the rows of scales ; 

 no dark cross bars. 

 /. Second anal spine rather short, 3 in head; stripes very distinct; pec- 

 torals IJ in head, reaching vent. D. X-I, 27; A. II, 6. 



PACIFICUS, 1804. 



