8 BULLETIN OF THE UNITED STATES FISH COMMISSION. 
Color dusky above, silvery below, the middle and lower part of sides darkened by numerous 
coarse, black specks, which are also numerous on opercles and upper portion of cheeks. Dorsal and 
caudal dusky. Basal portion of anterior anal rays and inner face of pectorals dusky, the inner face 
of ventrals sometimes minutely black-punctate in adults. The sharp division of color between tipper 
and lower parts, which suggested the name bicolor, is usually not very evident. 
Tho following table gives proportionate measurements in hundredths of the length from tip of 
snout to base of caudal, in four specimens from Klamath Lake: 
Itutilus bicolor (Girard).— Drawn by Anna L. Brown from a specimen from Upper Klamath Lake. 
9. Rutilus bicolor (Girard). 
Algansea bicolor Girard, Proc. Ac. Nat. Sci. Pliila. 1856, 183. Klamath Lake. 
Myloleucus parovanus Cope, Proc. Ac. Nat. Sci. Phila. 1893, 143. Klamath and Goose lakes. 
Myloleucus thalassinus Cope, 1. c., 144. Goose Lake. 
? Myloleucus formosus Cope, 1. c., 144. Silver, Chewaucan, and Warner lakes. Not Algansea 
formosa Girard. 
f Leucos bicolor Jordan & Henshaw, Report Chief of Engineers, Geogr. Surv. W. 100th Mer., 193, 
1878. Warner Lake. 
This species is very similar in appearance to Ji. obesus from the Truckee and Humboldt rivers and 
their connecting lakes, differing only in the larger scales and the additional ray in the dorsal fin. Tho 
body is robust, the mouth oblique, the snout not obtuse. The maxillary reaches the vertical from 
front of eye in adults and is shorter in the young. Snout 3| to 4 in head; eye 5£ in adults; interor- 
bital width 2| to 3£. Head 3J- to 3j in length; depth 3§- to 4. Teeth 4-5, the cutting edge broad and 
deeply channeled in young and adults, the hook largely obsolete in the latter. 
Scales marked with strong concentric lines and radiating ridges. In fifteen specimens examined, 
there were 47 to 52 pores in the lateral line, 10 or 11 scales in an oblique series running from median lino 
Measurements. 
No. L 
I No. 2. 
No. 3. 
No. 4. 
Total length in millimeters 
250 
175 
120 
92 
Length of head 
27 
20 
24 
Length of snout 
g 
7 
7 
6 
Diameter of eye 
5 
5 
6 
6 
Interorbital width 
9 
g 
g 
8 ! 
Length of maxillary 
8 
g 
7 
7 ! 
Greatest depth 
27 
27 
26 
22 
Least depth of caudal peduncle... 
10 
10 
11 
9 
Length of caudal peduncle 
23 
23 
23 
23 
Distance snout to front of dorsal. - 
54 
54 
50 
52 
Snout to ventrals 
51 
50 
48 
50 ! 
Base of dorsal 
13 
13 
13 I 
Base of anal 
10 
9 
11 
11 ! 
Height of anal 
15 
14 
1G 
io ! 
1 Height of dorsal 
19 
18 
19 
19 ! 
1 Length of pectoral 
18 
17 
20 
18 | 
! Length of ventral 
15 
15 
10 
15 | 
1 Length of caudal 
23 
22 
25 

