

260 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



reaching to beyoucl its middle. Caudal peduucle rather stouter than in 

 R. tergisus, and the fin not so deeply forked. Back less arched and 

 snout blunter than in the other species, the mouth larger and more 

 oblique. Pectorals longer and veutrals shorter than in H. tergisKs, 

 Belly cariuated both before and behind ventrals. Bluish ; sides silvery. 

 with golden lustre. Head 4J; depth 3.^. D. 9; A. 32; scales 6-56-7. 

 Ohio Eiver to the Saskatchawan ; common northward. 



{Ampliiodon alosoides Raf. Journ. Phys. Paris, 1819, 421: Hyodon chrympsis Richard- 

 son, Fauna Bor.-Amei'. iii, 232, 1836: Hyodon chrysopsis i or Asun, Ball. U. S. Nat. Mus. x, 

 68, 1877: Hyodon ampliiodon Raf. Iclitb. Oh. 1820, 42.) 



* Belly in front of ventrals not carinatecl; dorsal fin with 11 or 12 developed rays, 

 t Belly behind ventrals carinated, 



433. II. tergiSHS Lo Sueur. — Moon Eye ; Toothed Herring. 



Body oblong, moderately compressed. Eye large, 3 in head, the max- 

 illary barely reaching its middle. Pectoral fins not reaching ventrals, 

 the latter just short of vent. Belly behind ventrals somewhat carinate. 

 Color silvery, olive-shaded above. Head 4J; depth 3. D. 12; A. 28; 

 scales 5-55-7. L. 12 inches. Great Lakes and Mississippi Valley; 

 abundant in our larger streams. One of our handsomest fishes; not 

 valued as food. 



(Le Sueur, Journ. Acad. Nat. Sci. Phila. i, 364, 1818: Hiodon clodalus Le Sueur, 1. c. 

 367: Cyprinns (Abramis?) smithi Rich. Fauna Bor.-Amer. iii, 110; Giinther, vii, 375; 

 Jordan, BuU. U. S. Nat. Mus. s, 68, 1877.) 



H Belly nowhere carinated. 



134. H. selenops Jordan & Bean. 



Body more elongate, little compressed, not elevated. Belly nowhere 

 carinate. Eye very large, 2 J in head. Pectorals not reaching nearly 

 to ventrals. Clear silvery. Head 4^; depth 4. D. 12; A. 27; Lat. 1. 

 50. Cumberland Eiver and southward. 



(Jordan & Bean, Bull. U. S. Nat. Mus. x, 68, 1877.) 



Family XXXVI.— ELOPID^. 



{The Big-eyed Herrings.) 



Body elongate, not much compressed, covered with cycloid scales. 

 Head naked. Mouth broad, terminal, the lower jaw prominent. Pre- 

 maxillaries not protractile, short, the maxillaries forming the lateral 

 margins of the upper jaw. Maxillary composed of about three pieces, 

 extending backward beyond the eye. An elongate bony plate between 

 the branches of the lower jaw (like the gular plate in Ainia). Bands 



