FISHES OF COLORADO 79 



f. Spots numerous, many below the lateral line; a pink or red lateral band usually 

 present; in some specimens the head and region in front of the dorsal fin may be 

 quite free from spots. 



g. Scales rather prominent, about i6o cross-rows; general color light, often silvery, 

 darker dorsally; sides iridescent, with a light pink band which may be quite 

 red and prominent or almost wanting; spots more abundant back of the dorsal 

 fin than in front of it . . 5. clarkii spilurus (Cope), "Rio Grande Trout" 

 gg. Scales smaller than the preceding form, about 185 cross-rows; general color 

 greenish to dusky; a distinct, red, lateral band; black spots usually rather large 

 and quite numerous over the entire body, both in front of and posterior to the 

 dorsal fin; lower fins bright red; some individuals with the fins and lateral 

 band orange-red; many specimens with a brassy luster. 



S. clarkii pleurilicus (Cope), "Colorado River Trout" 

 ff. Spots large and not numerous except on the caudal peduncle, few if any below the 

 lateral line and in the region in front of the dorsal fin; general color green, quite 

 dark to almost black dorsally; lateral red band wanting or represented by but a few 

 red clouds; pectoral, ventral and anal fins reddish, in breeding males bright red; 

 red on the throat quite prominent; flesh usually red or pink; about 180 cross- 

 rows of scales. . . 5. c/ar/^M 5/oOTJa5 (Cope), "Green-backed Trout" 

 ee. Pectoral, ventral and anal fins bright yellow; a broad, yellowish area along the lateral 

 line; no red on the head, fins or body excepting the red mark on each side of the throat 

 near the inner margin of the lower jaw; black spots small, almost confined to the 

 posterior half of the body above the lateral line. S. clarkii macdonaldi (Jordan 



and Evermann), "Yellow-finned Trout of Twin Lakes" 

 hb.'^Sides of the body with red spots, which are more or less ocellated with white; tail without 

 black spots. 



h. Adipose fin edged with orange-yellow; general color brownish; red spots numerous; black 

 spots large and margined with light gray or white; sides of the body somewhat silvery. 



S.fario Linnaeus, "Brown or Von Behr Trout" 

 hh. Adipose fin very slightly if at all edged with orange yellow; red spots few or rarely entirely 

 wanting; black spots few; general color brownish, sides quite silvery. 



S.fario levenensis (Walker), "Loch Leven Trout" 



Salmo sebago Girard 

 Landlocked Salmon, Sebago Salmon 



Salmo sebago Girard, Proc. Acad. Nat. Sci. Phila., p. 380, 1853 (Sebago Lake, Maine); Juday, 

 Bull. U.S. Fish Com., Vol. XXVI, p. 162, 1906 (Twin Lakes). 



Salmo salar sebago (Girard)— Jordan, Bull. U.S. Fish Com., Vol. IX, p. 16, 1889 (Twin 

 Lakes). 



The Landlocked Salmon is a native of the lakes of northern Maine, Lake 

 Sebago, and other lakes, although it is derived, by becoming permanently land- 

 locked, from the Atlantic Salmon, Salmo salar Linnaeus, of the eastern coast. 

 The differences between the Sebago Salmon and the Atlantic Salmon are so slight 

 that the former is often regarded as but a variety of the latter. The Landlocked 

 or Sebago Salmon was introduced into Twin Lakes about 1885 and other ship- 

 ments of this fish have been planted there subsequently, one of the largest being 

 made in 1902. It has become established in the two lakes but is not very abun- 

 dant. Juday' states that "one was caught weighing 6 and another 45 pounds" in 



• Bull. U.S. Fish Com., Vol. XXVI, p. 162, iqo6. 



