INVESTIGATIONS IN THE COLUMBIA RIVER BASIN. 
197 
lu the preceding table we have arranged the data lieginniug with the lowest average number of 
anal rays (13), and proceeded from that to the highest (201). In the table which follows we 
have arranged the localities in order of elevation, beginning with the lowest. 
Table showing ike reiaiion of aUitnde io number of anal fin rays in Lenciscns balteatus. 
Localities. 
Approxi- 
mate alti- 
tude. 
Average 
No. (if 
anal rays. 
No. of 
speci- 
mens on 
which 
averages 
are based. 
Lake Wasliington 
1 
14 
47 
Mission a 
1 
19 
79 
Newaukum River 
204 
15 
3 
Skookumcliuck River : 
204 
16 
13 
Umatilla ft 
300 
19 
10 
Umatilla 
300 
18 
12 
Wallula 
326 
17 
C 
I’asco 
375 
IS 
3 
Lewiston 
750 
18 
16 
Pendleton 
1, 070 
14 
26 
Raniloops a 
1, 158 
20t 
2 
Potlatch Creek at Le'^vistou 
1,200 
17 
i 
Meyers Falls 
1,200 
14 
21 
Sicamous a 
1, 300 
17 
58 
Revelstokea 
1,475 
14 
1 
Dart’s Milts 
1,850 
13 
70 
Gridin naked 
1, 900 
15 
14 
Snokaue River, Spokane 
1, 910 
14 
11 
ftangman Creek, Spokane 
1,910 
15 
11 
New])ort 
2, 000 
15 
8 
Sand Point 
2, 100 
15 
67 
Snake River, Pavetto 
2, 150 
18 
10 
Payette Kirer, Payette 
2, 150 
16 
154 
CaUlwellft 
2, 372 
18 
34 
Caldwell 
2, 372 
16 
65 
Golden a 
2, 550 
16 
18 
La Gramled 
2,786 
16 
23 
Flathead Lake 
3, 100 
15 
11 
Poster ek 
3,1 00 
1.54 
6 
Silver Row 
5,344 
14 
14 
a These data are from Dr. Eigeiimainrs yiaper. 
Comparing these wdth Eigeumann’s results, it will bo seen that the average number of 
rays from our lowest elevation (11 at Lake Washington) is fewer by 2 than the average from 
his highest elevation (16 at La Gr.inde) and that our average for Newaukum River (201 feet 
elevation) is fewer tliau any average found by him except at Eevelstoke (1,175 feet), where 
his average is 15-^, and at Griffin Lake (1,900 feet), where it is 15. The average found by us at 
sea level (Lake Washington) is identical with that found at Silver Bow,'* whose elevation is 
5,311 feet, the greatest elevation from which specimens have been examined. When there is 
absolutelj'' no difference between the aver,ages for the lowest and the highest elevations it is 
not possible for us to see any reason for the generalization, “the higher the altitude the fewer 
the numlier of raj^s.” If the figures show anything, they show that the number of anal tin 
raj^s does not decrease ivith increasing altitude. It is also stated that the greatest range of 
variation is at the lowest altitudes, but further on it is stated that the “ greatest variation 
in this [the Columbia] system was not at the lowest altitude, but at an elevation of 2, .372 feet. ’ 
The range here was found by him to be through 10, or from 12 to 21. We find the same range 
of variation (from 13 to 21) in our specimens from Payette (2,1.50 feet.) The range found at 
the point nearest sea level in the Columbia basin (at Umatilla, 300 feet) w as only through 6 
(15 to 20), and the average for that place is nearly identical -with that at Caldivell. The vari- 
ation found by Eigenmann among his Mission specimens is through 9 (16 to 24), while that of 
our Lake Washington specimens is through 7 (12 to 18). The averages for these two places, 
both of 'which are at sea level, are 19 and 14, respectively. 
We consider Lenciscns lateralis (Girard) a simx)le synonym of L. balteatus. f)nr mat<'rial 
covers well the type loc.alities of both (Columbia River at Fort Vancouver and Fort Steila- 
coom on Puget Sound) and indicates but one form. We are certainly not prepared to consider 
lateralis a subspecies of balteatus, occupying the same brook 'wdth its parent form, as indicated 
by Eigenmann, 
L. giUi. ]irob.'il)ly a good species. 
