244 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 
tral fius. Diameter of orbit equal to length of muzzle, aud entering 
length of head 3^ times. The latter enters the length to origin of the 
caudal tin 4 times. The greatest depth enters the same oi times. The 
dorsal fin originates above a point behind the entire base of the ven- 
trals. Eadii : D. I, 8 ; A. I, 8. The mouth is rather large, the extrem- 
ity of the maxillary bone extending nearly to the line of the pupil of the 
eye. The head is rather flat above and wide, the parietal width being 
about one- third the length between the last dorsal ray and the base of 
the caudal. The distance to which the lateral line extends is unknown, 
because the scales of the posterior part of the body are lost. Color 
brownish olive above, below silvery; a black band, not well defined on 
the borders, extends from the end of the muzzle to the base of the cau- 
dal fin, where it terminates in a black spot; a reddish spot at the base 
of the anterior dorsal rays ; muzzle dark.” ( Cope.) L. 24 inches. Upper 
^Missouri Eiver. “ This species ditters from P. neotjwus in its slender form 
and the small number of rows of scales.” 
(Cope, Araer. Nat. July, 1879, 440.) 
Scales large, 35-40 iii the lateral line. 
406. P. pSilegefhoHtis (Cope) Jor. &, Gilb. 
Body short and deep. Mouth very oblique, the jaws even, the maxil- 
lary reaching front of the eye, which is rather large. Dorsal behind ven- 
trals. Lateral line entirely wanting (in the typical examples; probably 
more or less developed in the adult, perhaps complete, in which case 
the species is a Telestes). Olivaceous; a broad plumbeous lateral baud; 
a dusky dorsal line; belly golden. Head 4; depth 3^. D. 7; A. 8; 
scales 11-37; teeth 1, 5-4, 2. L. 14 inches. Beaver Eiver, Utah. {Cope.) 
(Clinofitomus phlef/ethonUn Cope, Proc. Araer. Pliil. Soc. Pliila. 1874, 137: Gila 
phlcgeth on t is Copo,, Zool. Wheeler’s Expl. W. 100th ^ler. v, 6.57.) 
104.— LEUCUS Heckel. 
Eoaches. 
{Mplolencus Cope; ?Ahjansea Girard; not Lenciis Kaup, 1824, a iioininal genus of 
Laridw, the word Lencus being a misprint for Leucus.) 
{Lexicon Heckel, Russeggers’ Reiseu, i, 1038, 1843: type Lcucos cisalpinns Heckel.) 
Body stout, compressed. Mouth normal, oblique; no barbel. Teeth 
4-5 * or 5-5, hooked, with narrow grinding surface, the lower usually on 
Teeth 4-4 in the type of Leucus tincella. 
