ETHEOSTOMATIDiE. 7 



Boleosoma they are separated by the uou-protractile upper jaw, and 

 they seem to have little relatiou with the species referred to yothonoius. 



Na7wstonia, then, appears to be a distinct genus, or at least a 

 strongly marked section, and I propose to accept the name and to se- 

 lect, as the type of the group, P. zonalis Cope (=jV. jnctum Tutnam, 

 MSS.). Nanostoma bears souewhatthe same relatiou to J^othonotus that 

 Boleichthys does to Poecilichthys. 



Generic characters. — Body fusiform, little compressed, entirely scaly, 

 without enlarged ventral plates. Mouth small, subinferior, the upper 

 jaw not protractile ; vomerine teeth ; scales large ; lateral line complete ; 

 cheeks and opercles scaly ; dorsals well separated, the second much 

 larger than anal, higher but rather shorter than spinous dorsal. The 

 separation of the dorsals, the form of the body, the small size of the 

 mouth, and the large size of the scales separate Ilanostoma from No- 

 iJionotus. The scaliness of the cheeks, neck, and throat are dittereuces 

 of some importance. 



4. HADROPTERUS TESSELLATUS, up, nov. 



? Boleosoma tesseUatim, TnOMPSON, Appendix Hist. Vt. p. 31, ld53 (not of De Kay, 



1842). 

 ? Cottogaster tessellatus, Putnam, Bull. Mus. Comp. Zool. i, 1863, 5. 

 ? Boleosoma tese?/a/!tm, Thompson, wee De Kay, Jordan & Copeland, Bull. Buff. Soc. 



Nat. Hist. 1876, 135, 163.— Jordan, Man. Vert. 1876, 222. 



A specimen of an Etheostomoid in the United States National 'Mn- 

 seum, labelled Cottogaster, has the characters assigned by Prof. 

 Putnam to his genus of that name, and is presumably the species which 

 he catalogues, without description, as C. tessellatus. Prof. Putnam ac- 

 cepted the specific name from Thompson, who seems to have supposed, 

 erroneously, that he was describing De Kay's Boleosoma tessellatum. 

 Prof. Putnam states that his Cottogaster tessellatus is a species of 

 Boleosoma, but the species now under consideration is certainly a Ea- 

 dropteriis, as I understand the latter genus. I therefore propose for my 

 species the name of Hadropterus tessellatus Jordan. If Prof. Putnam's 

 species proves different, it should be renamed, as there has been al- 

 ready a tessellatum in Boleosoma, and mine will keep its name. If the 

 two are, as I suspect, identical, then we will write Hadropterus tessella- 

 tus (Putnam) Jordan, and no confusion in nomenclature need arise. 



H. tessellatus has the form of Imostoma shumardii, fusiform, with a 

 broad, heavy head; mouth wide, the upper jaw rather longest, not pro- 

 tractile; cheeks and opercles naked (Hn life); chest naked; neck 



