108 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
margin of eye) ; depth of head greater than length of snout plus eye (depth of head loss than 
snout plus eye) ; scales of breast obscure, imbedded forward (scales of breast regularly 
imbricated, not imbedded); margins of lower fins all well rounded, all of them shorter than 
ill tj’pical catostomus (margins of lower fins all more angular, some of the rays being longer 
than others). Distance of end of superciliary mucous canal from transverse nuchal canal twice 
as great as in the typical form. Such differences would be considered of no value for pur- 
poses of classification in specimens from the same river system, and indeed I am not able to 
find any tangilile differences between specimens 190 mm. long from the Columbia at EeveL 
stoke and the Bow at Calgary or the Swift Current. The larger specimen has the back and 
sides quite dark, centers of the scales toward the belly white; belly entirely white. A red- 
dish baud along the lateral line. The young from all localities are mottleil gray. 
9. Catostomus griseus (Girard). Swift Current, Jlediciue Hat, Craig. One siiecimen, 116 ram. 
long, was taken at Swift Current. Caudal as long as head. If in the length. D. ii, 10|. 
Sides to ventral surface dark-grayish, variously mottled. Lower surfaces, white. A number 
of specimens w'ere taken at Medicine Hat, the largest 90 mm. long. These smaller specimens 
can readily be elistiugnished from C. catosiomus of the same size bj' their much larger mouth, 
which very much resemldes that of I’aiiiosteiis. The jaws are provided Avith horny or carti- 
laginous sheaths, making the resemblance to Paiifosteiis still greater. 
10. Cato.stomus macrocheilus Girard. Sicainous, Kamloops, Umatilla, La Grande, Caldwell, and 
Idaho Falls. I saw a species of this genus in Griffin Lake, but was unable to secure it. In 
all probability it rvas C. macrocheUns, since this species was obtained a few miles farther Avest, 
at the month of the outlet of this lake. The largest specimen was obtained at La Grande, and 
measured 380 mm. It is quite dark to beloAv the lateral line, Avhere, from a line from just 
above the upper lip to the loAver part of the caudal, the color abruptly changes to white. The 
pectorals, A'cntrals, and part of the anal are dusky, and a dusky bar extends Tipward from the 
base of the pectoral. The local Auariation in dorsal rays is Avell marked. Aside from the two 
undivided rays at the beginning of the fin the rays are as follows: 
Locality. 
Dorsal rays. 
11* 
12* 
13* 
11* 
154 
164 
1 
1 
3 
9 
3 
4^ 
34 
s 
1 
9 
9 
1 
3 
3 
1 
3 
1 
These last sjAecimeus approach Catosiomus ardens. 
11. Catostomus commersoni (Laciipede). Winnipeg, Westbourne, Qu’Appelle, Regina, Moose Jaw,, 
SAvift Current, Maple Creek, IMedicine Hat, Calgary, Poplar. Very abundant everywhere. 
Scales, 55-69. 
12. Moxostoma aureolum (Le Sueur). Winnipeg, Westbourne, Brandon, Poplar. Lower fins, and 
e.specially the caudal, red. D. to 16t. Specimens 240 mm., from Winnipeg, have the head 
5 in the length. 
13. Moxostoma anisurum Rafinesque. Winnipeg, Brandon. This species is much less abundant 
at Winnipeg than the preceding. The specimens measure from 90 to 285 mm. Head, 34 to 4. 
D. 164 or 174, counting all the rays. A. 8-f. Tipper caudal lobe little longer than loAver in the 
largest specimen. The largest specimen differs little from one obtained at Toledo, Ohio. 
Scales, 6-39 to 43-5. Color lighter than in the preceding species, no red on the tins. 
14. Hybognathus placita Girard. Abundant at Poplar, Init not seen elseAvhere. 
15. Acrocheilus alutaceus Agassiz & Pickering. Umatilla, CaldAvell. 
16. Pimephales proiiielas Rafinesque. Winni[)eg, Westbourne, Brandon, Qu’Apipelle, Regina, 
Swift Current, Maple Creek, Medicine Hat. Very abundant eAmrywhere, especially so at 
Regina and Swift Cmrent; least so at Qu’Appelle. 
