Bull. U. S. B. F., 1912. 
Plate XL 
19. — Coho scale, X 40 . From yearling, 4 ^ inches long, taken at 
Swanton, Cal., April 23, 1910, during seaward migration. 
Fig. 20. — Coho scale, X 40- From immature female, 9^ inches long, 
in second year. Kverett, Wash., August 16, 1910. 
