122 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY lY. 
Lateral line well developed, straiglitisli. Fins generally rather small. 
First ray of dorsal nsiially about midway of body, its rays few, 0-12 
in number. Yeutrals inserted rather under posterior part of dorsal, 
their rays 10 or 0. xAiial short and high, with 7 developed rays. Cau- 
dal rather shallow-emarginate. Pectorals well developed. Air-blad- 
der with two chambers. Size rather small. Species numerous in the 
Pocky Mountain region, (-di/, all ; oario'^^ bone.) 
* Scales moderate, 80-85 in the lateral line. 
a. Scales snbequal over the body, not reduced forwards. 
123. P. 5s3ei!>eiHS (Baird & Girard) Jordan. 
Body rather stout, subfiisiform. Head slender, rather short, 4^ in 
length. Eye 5 in head. Yeutrals reaching nearly to vent. Scales 
small, scarcely crowded anteriorly, 80 in the lateral line, 20-30 in a 
cross-series. Depth 4i in length. Dorsal midway between snout and 
upper caudal rays. Caudal short, emarginate. Color dark brown, 
faintly mottled 5 sides with orange in the males. {Girard.) Lake Guz- 
man, Mexico. 
{Catostomm ideheius Baird & Girard, Proc. Acad. Nat. Sci. Pliila. 1854, 28: Catosto- 
mu8 j)lebcj us Giiather, vii, 15; Jordan, 1. c. 184.) 
124. P. deaiJEiiEttMS Cope. 
“The dorsal outline is arched, the head flat above, not elevated behind 
and niuch depressed on the muzzle. The muzzle is wide and does not 
project beyond the upper lip, which is appressed to its lower face and 
bears four rows of warts; its smooth commissural part is narrow. On 
the lower lip the tubercles advance nearly to the commissure ; this lip 
is deeply emarginate posteriorly. The eye enters the length of the head 
5 times, 2i times measuring the muzzle, and twice the interorbital re- 
gion. Head 4g times in length to end of caudal basal scales. Scales in 
30 longitudinal series, between dorsal and ventral fins. Yeutrals re- 
markably short, extending little more than half way to vent, originat- 
ing under posterior third of dorsal. Pectorals well separated. Isthmus 
wide. Color above blackish, with a strong inferior marginal shade on 
the lower part of the sides, and the lighter tint above ; a brown spot 
just above axilla is cut off from it by a band of the yellow color which 
covers the belly and head below.” {Cope.) Probably from Green Eiver. 
(dlinonms dcljjhinus Cope, Hayden’s Geol. Surv. Wyom. Terr. 1872, 436.) 
125. P.bardsas Cope. 
This species is distinguished by its very short head and marked col- 
oration, resembling in that respect the C. (juzmaniensis of Girard; with 
