968 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



Page 156. Professor Hay (Proc. U. S. Nat. Mus. 1882) distinguishes 

 Hyhognathus argyritis from the less common H. nuchalis by the follow- 

 ing characters: 



a. Eye small, shorter thau snout; mouth small, horizontal, the lower jaw short and 

 included; suborbitals broad, the anterior suborbital twice as long as wide; intes; 

 tinal canal 7 to 10 times length of body Nuchalis. 



aa. Eye large, longer than snout; mouth small, oblique, the jaws equal; suborbitals 

 very narrow, the anterior thrice as long as broad; intestinal canal 4^ to 7| times 

 length of body Argyritis. 



Page 160. After HyhorJiynchus sttpcrciliosus add: 

 §0 (6).— TIKOKO^ Hay. 



(Hay, Proc. U. S. Nat. Mus. 1882: type Tirodon amnigenus Hay.) 



Pharyngeal teeth 2, 4-4, 2, compressed, not hooked, and with a broad 

 grinding surface 5 lower pharnygeal bones broad, sharply curved. 

 Otherwise as in HyhogvMthus. [rstpcu, to wear away; oduuq, tooth.) 



194 (h). T. aiiMBiiiigeimis Hay. 



Yellowish green, silvery below; upper parts dotted with black; these 

 dots forming posteriorly a dark streak along lateral line, and one along 

 each side of anal; tins pale. Form and appearance of Ilyhognathus 

 argyritis. Jaws thin, the lower slightly included; mouth small, rather 

 oblique, the maxillary not reaching front of eye; eye 3 in head, equal to 

 snout. Lateral line decurved, complete. Dorsal inserted slightly before 

 ventrals, a little nearer base of caudal than snout ; anal small. Head 3^ ; 

 D. 8; A. 7; scales 5-38-3. Teeth 2, 4-4, 2, formed as in Ryhognathus. 

 Intestinal canal 3 J times length of body. L. 1^ inches. Pearl River, 

 Mississippi. {Say-) 



(Hay, Proc. U. S. Nat. Mus. 1882.) 



Page 261. Under Elops saurus the gular plate is about 3 times as 

 long as broad. 



Page 296. In Hyphalonedrus clialybe'ms the interorbital width is one- 

 fourth the eye, not "4 times." 



Page 297. Coregonus couesi is identical with Coregonus uHlliamsoni, 

 and may be suppressed. 



Page 318. Salvelinus naresi seems to be indistinguishable from Salve- 

 linns oquassa. It may therefore be erased. 



