196 
BULLETIN OF THE UNITED STATES FISH COMMISSION. 
interorbital width a little greater than snout; snout decurved; mouth wide, oblique, lower 
jaw verj^ slightly projecting; maxillary reaching to within front of orbit; caudal peduncle 
long, the distance between anal tin and base of caudal about 1^ in head, least depth of caudal 
l)eduucle 2| in head. Fins small; height of dorsal It in head, its free edge slightly convex; 
origin of dorsal somewhat behind ventrals, a little nearer base of caudal than ti^i of snout; 
anal about size of dorsal; length of pectoral equal to height of dorsal, their tips rarely 
reaching base of ventrals; ventrals short, equal to snout and eye. Lateral line somewhat 
interrupted, little decurved ; scales crowded anteriorly. 
21. Leuciscus balteatus (Richardson). 
Cyjyrinus (Abramis) balteatus Richardson, Fauna Boreali-Americaua, iii, 301, 1836. Type locality: 
Columbia River, presumably at Fort Vancouver, IVashiugton. 
Ixichurdsoiiius lateralis GivAul. Proc. Acad. Nat. Sci. Phila. 1856, 202. Type locality: Fort Steil- 
acoom, Puget Sound. 
This is one of the most abundant species of the Columbia and Lower Snake River, but 
appears not to occur in the Upper Snake, where it is replaced by L. liydropblox. The accom- 
panying table shows the stations at which this species was taken, together with the number of 
individuals from each locality, and the number of rays in the anal fin. It will be seen that 
the latter vary, in our siiecimens, from 11 to 22 in number, the averages in the counts from 
the different localities ranging from 13 to 18. 
In a recent paper,* Dr. Eigeninann announces the discovery that in this species the 
number of anal rays decreases with increasing altitude or that “the higher the altitude 
the fewer the number of rays and the narrower the limits of variation.” To successfully 
establish such a generalization a very large amount of evidence would be necessary. As a 
contribution to this question we append the following table, which can not, we think, be 
interpreted as showing the truth of the theory. In this table we give, (1) the localities from 
which sjiecimens were examined; (2) the range in variation in anal rays among the 
individuals; (3) the total number examined from ei^ch locality; (4) the average number of 
anal rays for each locality, and (5) the approximate altitude of each place. Fractions of 4 or 
more are included in the next higher number: 
Number of .aual ravs. 
Locality. 
11 12 13 ! 14 15 
Little S])otane River, Dart’s Mill 
Colville River, Meyers Falls 
Spolcane River, Spokane 
Revelstoke, B. C. a 
Browns Gulch, Silver Bow 
Diiiatilla River, Pendleton 
Lake AVashiiifftou, Seattle 
Flathead Lake 
Gritliu Lake, B. C. n 
Small Creek at Sand Point, Idaho 
Pend d’Oreillo River, Newport 
Hangman Creek, Spokane 
Natchess River, North Yakima 
Newaukum River, Chehalis ... 
Post Creek, Flathead L.ake 
Golden, B. C.a 
Boise River, Caldwell 
Skookunichuck River, Chehalis 
Payette Ri\er, Payette 
La Grande, Oreaon a 
Potlatch Creek, Lewiston 
Sicamous, B. C. (t 
Walla AValla River, AVallula . . - 
Caldwell, Idaho a 
Clearwater River, Lewiston . . . 
Columbia River, Pasco 
Fniatilla River, TTmatilla 
Snake River, Payette 
TTmatilla River, Umatilla a 
Mission, B. C. a 
Kamlooxis, B. C. a 
14 
30 ; 19 
17 
18 
19 
20 
21 
22 
23 
24 
1 
1 
1 
1 
C 
1 
1 
4 
12 
2 
28 
4 
1 
28 
2 
7 
5 
1 
2 
1 
1 
7 
1 
8 
1 
25 
4 
2 
\2 
3 
2 
2 
8 
’ s' 
4 
1 
2 
4 
5 
13 
5 
2 
7 
4 
1 
5 
3 
1 
25 
2 
1 
1 
1 
2 
18 
1 
1 
8 
1 
2 
2 
2 
A ver- 
age No. 
anal 
Approx- 
Total 
No. ex- 
imate 
eleva- 
amiued. 
tion in 
rays. 
feet. 
70 
13 
1, 850 
21 
14 
1,200 
11 
14 
1, 910 
1 
15 
1,475 
14 
14 
5, 344 
2B 
14 
1, 070 
47 
14 
1 
11 
15 
3, 100 
14 
15 
1, 990 
6’ 
15 
2, 100 
8 
15 
2, 000 
11 
15 
1,910 
8 
15 
1,078 
3 
15 
20i 
6 
15J 
3, 100 
18 
16 
2,550 
65 
16 
2,372 
13 
16 
204 
154 
16 
2, 1.50 
23 
16 
2, 786 
4 
17 
1,200 
58 
17 
1,300 
e 
17 
326 
34 
18 
2, 372 
16 
18 
750 
3 
IS 
375 
« 12 
18 
300 
10 
18 
2,150 
10 
19 
300 
79 
19 
1 
204 
1, 158 
ff These are the localities from which specimens were examined by Dr. Eigenmaim. The data are those given by him. 
* Results of Explorations in Western Canada and the Northwestern United States. Bull. U. S. F. C. 1894, 131. 
