122 coxTKir.rnnxs TO NORTH AMERICAN ICHTHYOLOGY iv. 



Lateral line well developed, straightish. Fins generally rather small. 

 First ray .if dorsal usually about midway of body, its rays few, 9-12 

 in number. Yeiitrals inserted rather under posterior part of dorsal, 

 their rays 10 or 0. Anal short and high. with 7 developed rays. Cau- 

 dal rather shallow-emargiuate. Pectorals well developed. Air-blad- 

 der with two chambers. Size rather small. Species numerous in the 

 Rocky Mountain region, (-^, all; o0roy, bone.) 



Sralrs Kindi-rati-, ,-il-S,-, ill 



nal nvrr tin' liody, nut reduced forwards. 



Iii3. P. plcfocillS (I)aird & Giranl) Jordan. 



1'xidy rather stout, subfusiform. Head slender, rather short, 4VJ in 

 length. I\ve ~> in head. Ventrals reaching nearly to vent. Scales 

 small, scarcely crowded anteriorly, 80 in the lateral line, 20-.'.U) in a 

 cross-series. Depth 4 in length. Dorsal midway between snout and 

 upper caudal rays. Caudal short, emarginate. Color dark brown, 

 faintly mottled ; sides with orange in the males. (Girard.) Lake Guz- 

 man, Mexico. 



(Catostomua plebeius Baird & Girard, Proc. Acad. Nat. Sci. Phila. !;-."< 1, :2- : (.'utvxto- 

 mus j>l( bijun Giiutla-r, vii, 15; Jordan, 1. c. l^l.) 



I C 1. P. dclpEiiiaus Cope. 



"The dorsal outline is arched, the head flat above, not elevated behind 

 and much depressed ou the muzzle. The muzzle is wide and does not 

 project beyond the upper lip, which is appressed to its lower lace and 

 bears four rows of warts; its smooth commissural part is narrow. Ou 

 the lower lip the tubercles advance nearly to the commissure; this lip 

 i> decph emar-iiiate posteriorly. The eye enters the length of the head 

 r> times, l'?, times measuring the muzzle, and twice the interorbital re- 

 gion. Head I:; times in length to end of caudal basal scales. Scales in 

 :10 longitudinal series, between dorsal and ventral (ins. AVntrals re- 

 markably short, extending little more than half way to vent, originat- 

 ing under posterior third of dorsal. Pectorals well separated. Isthmus 



^ide. Color abo\e blackish, with a st rong inferior marginal shade on 

 the lower part of the sides, ;uid the lighter tint above; a brown spot 

 just abo\e axilla is cut oil' from il by a band of the yellow color which 

 cover, the belly and head below." (Cope.) Probably from C reen River. 

 (.l/i'i/.tmir, tliliiliiiui* Cope, ll:i\ili-n'.s Cml. Sui-v. Wynm. Terr. 1672, 430.) 



/5. I*. Imrdeas ('upr. 



This >pc-i-s is distinguished by its \.-ry short head and marked col- 

 , resembling in that resjx-ct the C. ////.:/// n imsix of Girard; with 



