244 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



tral fius. Diameter of orbit equal to length of muzzle, aud entering 

 length of head 3i times. The latter enters the length to origin of the 

 caudal fin 4 times. The greatest depth enters the same 5^ times. The 

 dorsal tin 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 iiosterior 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 

 ofthe anterior dorsal rays; muzzle dark." (Cope.) L. 2 J inches. Upper 

 Missouri Eiver. " This species diflers from P. neogceus in its slender form 

 and the small number of rows of scales." 



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



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



400. P. pBiSes^etBiontis (Cope) Jot. & 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 band; 

 a dusky dorsal line; belly golden. Head 4; depth 3^. D. 7; A. 8; 

 scales 11-37 ; teeth 1, 5-4, 2. L. 1| inches. Beaver River, Utah. ( Cope.) 



(CUnostomus pldefictUontis Cope. Proc. Araer. Phil. Soc. Phila. 1B74, 137: Gila 

 phlefjethonti-i Cope, Zool. Wheeler's Expl. ^Y. 100th Mer. v, 657.) 



104.— L,EUCUS Heckel. 

 Roaches. 



(Mi/Ioleucus Cope; ?Alfjansea Girard; not Lencus Kaup, 1824, a nominal genus of 

 Laridiv, the word Lencus being a misprint for Leucus. ) 



{Leucos Heckel, Russeggers' Reiseu, i, 1038, 1843: type Lcucos cisaljnnus 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 Leucvs tincella. 



