INVESTIGATIONS IN THE COLUMBIA RIVER BASIN. 
189 
3. Pantosteus jorclani Evermaim. 
rautosteiis Jordani Erermnim, Bull. U. S. Fish. Comiu. for 1892, .laiiuary 27, 1893, 51. Type locality : 
Red Rock River, Red Rock, Moutaiia. 
Faiitosteas columhianus Eigenmanu &. Eigemuauii, American Naturalist, February 4, 1893, 151. 
Type locality : Boise River, Caldwell, Idaho. 
Recent explorations of the Fish Commission have shown this sucker to be an abundant 
species iu the region a))Out the Black Hills in South Dakota and Wyoming. Dr. Eigenmanu 
was the first to oiitain it in the Columbia Basin, he having found it at Caldwell, Idaho, iu 
18i>2. During our investigations we found this to be au abundant and widely distributed 
species in the Columbia Basin. S])ecimens were obtained liy us at the following places; 
Snake River at Idaho Falls, 1; Ross Fork near Pocatello, 49; Boise River at Caldwell, 4; 
Payette River at Payette, 13; Umatilla River at Pendleton, 3; Columbia River at Umatilla, 
1; Natchess River near North Yakima, 9. A comparison of these specimens with a large 
series from various places in the ^Missouri River Basin shows them to be specifically identical. 
Y^oung examples from Payette, Caldwell, and elsewhere, agree jierfeotly with Dr. Eigenmanu’s 
description of P. coJnmhianus. The. dorsal rays vary from 10 to 13; the scales from 82 to 107. 
4. Catostomus catostomnn (Forster). 
Cyprinus catosfomiis Foi'ster, Philos. Trans., 1773, 155. Type locality : Streams about Hudson Bay. 
Sjieciiuens from Little Wood River, Shoshone, Idaho, 25; Ross Fork near Pocatello, Idaho, 
10; Payette River, Payette, Idalio, 2; Cmur d'Alene Lake, Cceur d’Alene, Idaho, 7; Lhuatilla 
River, Pendleton, Oreg., 4; Columbia River, Umatilla, Oreg., 1; Pataha River, Starbuck, 
Wash., 3; Mill Creek, Walla Walla, 81; Creek at Sand Point, Idaho, 38. 
D. 11 or 12; scales, 90 to 104. 
I'his species differs from laiqniinis, yriseiis, and catostomus (Everinanu; Eigenmanu) iu its 
thin and rather narrow lower lip, which is incised for but little over half its depth. Two well- 
separated series of large papilhe cross the lip between base of incision and sheath. 
5. Catostomus pocatello sp. nov. ^loo-yad-ee of the Fort Hall Indians. (PI. 21.) 
Type locality : Ross Fork of Snake River near Pocatello, Idaho, where 18 specimens were 
collected August 4, 1893. Type, No. 45385, U. S. Nat. Mus. Co-types, No. 45386, U. S. Nat. 
Mus., and Nos. 1135 to 1141, Aluseum Leland Stanford Junior University. 
Related to Catostomus catostomus (Forster). 
Description: Head, 4; depth, 5; eye, 44; snout, 2^; interorbital width, 2f; D. 10; A. 7; 
scales, 19-95-14, about 50 before the dorsal. Body moderately stout ; head heavy ; snout not 
very ])ointed; eye rather large — larger than in any related species, its diameter 2J iu snout 
or 21 in interorljital width; eye placed high; middle of i)upil a little nearer posterior edge of 
oi)ercle than to tip of snout. Mouth narrow; upper lip rather thick, but not pendent, with 
three deliuite rows of papilhe ; lower lip incised nearly to base, a single series of small papillm 
between sheath and base of incision; lobes of lower liji short and rounded; cartilaginous 
sheath of lips rather strongly developed. Scales small, crowded, and very much reduced in 
size on anterior part of body; lateral line imperfect. Origin of dorsal fin midway between 
tip of snout and base of caudal rays; greatest height of dorsal tin 14 in head, its free edge 
very slightly concave. Height of anal a little greater than that of dorsal, 1| in head ; pointed, 
reaching base of caudal tin. Pectoral about equal to anal ; ventral 1| in head. Peritoneum 
silvery, with dark punctulatious. Air-hhidder large. 
Color 111 alcohol, dark olivaceous above, and on sides to below lateral line somewhat 
mottled with darker ; under parts pale. Length, 150 millimeters. 
Au examination of the series of eighteen specimens shows some variation. Head, 3§ to 4; 
depth, 5 to 5-0 ; eye, 4-4 to 5-4 in young ; snout, 24 to 2|-2^ in young. The number of dorsal rays 
is usually 10, but in one example there are but 9. There is considerable variation iu number 
of scales in the lateral line, the number iu eleven examples counted being 90, 93, 93, 95, 96, 96, 
100, 101, 105, 106, 107, and 108, respectively ; the lateral line is frequently' irregular and inqier- 
fectly developed. 
From Catostomus catostomus, which this species resembles, it differs in its larger eye, fuller 
lower lip, and somewhat larger head. These characters may all prove unreliable, however. 
From C. griseus and C. Jatipiuiiis of the same size it differs iu its narrower upper lip and larger 
eye, as well as in other minor characters. 
