244 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY - IV. 



trill fins. Diameter of orbit equal to length of muzzle, and 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 5i times. The 

 dorsal fin originates above a point behind the entire base of the ven- 

 trals. Radii: 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 Hat 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 ;>.re lost. Color 

 brownish olive abore, 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 I'm, where it terminates in a black spot; a reddish spot at the base 

 of the anterior dorsal rays; muzzle dark." (Cope.} L. 2i inches. Upper 

 Missouri River. " This species differs from P. neoyivus in its slender form 

 and the small number of rows of scales." 



(Cope, Amor. Nat. July, 1879, 440.) 

 "** Scales large, 35-40 in the lateral line. 

 IO6. P. pJiIegetliontis (Cope) Jor. & Gilb. 



Ilody 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 

 tin- species is a Tdcstes}. Olivaceous; abroad plumbeous lateral band; 

 a dusky dorsal line; belly golden. Head 4; depth 3i. D. 7; A. S; 

 scales 1 1-,'iT; teeth 1, 5-4, 2. L. 1 inches. Beaver River, I'tah. (Cope.} 



]>lilr!/<-tln>ntix Copi-. Proc. AIIHT. 1'liil. Sue. Phila. 1H74, 137: (lila, 

 , /<th<t fi*C<pr, /<><".]. Wheeler's Kxpl. \V. 100th Mer. v, (i~i7.) 



101. IJEUCUS Ilcck.'l. 



Roaches. 



-UH ( 'ufic: '? .llt/niisra Oiranl: not Li-urn* Kaiip. 1^J4, a nominal gcnita of 

 f.ariiln, ih<- \\unl I.ein-ux liein^ ;i niLsprinl I'ur 



Hrckr], l'ns>r^j.',.|- s ' Rrixcn, i, 103^, 1^43: tyi"- Leuoos oisaJpinus Ilerkel.) 

 Ilody stout, compressed. Mouth normal, oblique: no barbel. Teeth 

 4_.->* ,,r .-)-5, hooked, with narrow grinding siii-l'ace. tlie lower usually on 



Teeth 4-4 in tin- i\] l' J.CIU-UM tinn lla. 



