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<br />160
<br />
<br />Utah /icade11l)' of Seu.nces, Arts and Letters
<br />
<br />[Vol. Xlii 1936J
<br />
<br />(10) Genus Hesperoleucus Snydcr, 1912.
<br />H. symmctriClIS (Baird and Girard.) Onc species. . . . . . p. 170
<br />
<br />D. Anal base long, or 9 to 22 rays; the fins all high; body
<br />more or less compressed; head blulltish, with large eyes;
<br />scales modcrate, not closely imbricated, 55 to (,S in lateral
<br />line.
<br />
<br />(11) Genus Richarrlsonius Girard, 1856.
<br />
<br />The two species of this genus may be separat~d as follows:
<br />
<br />a. Scales very small, 80 in the lateral line; head not de-
<br />pressed; species of small size, form the Lake Bonneville
<br />Basin. C. cope; (Jordan and Gilbert) . . . . . . .. . . . . . . p. 16
<br />aa. Scales moderate, 55 to 64 in lateral line; body moderately
<br />elongate; annal rays usually 11 to 12; one dark lateral
<br />stripe, forking anteriorly. C. hydrophlox (Cope)... p. I~
<br />
<br />DO. Scales in a longitudinal series about 36; no caudal spots;
<br />no trace of lateral line.
<br />
<br />(12)
<br />
<br />Genus Iotichthys Jordan and Evermann, 1896.
<br />
<br />J, phlegethontis (Cope).............................. p. 170
<br />~
<br />ODD. Anal base short, its rays 7 or 8, rarely 9, fills low; I
<br />caudal peduncle very deep and compressed, dorsal in_j
<br />serted above ventrals; scales comparatively large and..
<br />well imbricated, about 56.
<br />
<br />Genus Siooma Girard, 1856.
<br />
<br />
<br />Iwj
<br />
<br />(13)
<br />
<br />BE.
<br />
<br />S. otraria Girard. Single species.. . . . . . . . . . . . . . . . . . . . p.
<br />Barbels present, scales small, 60 to 90 in lateral line.
<br />
<br />E.
<br />
<br />Premaxillaries not protractile.
<br />
<br />(14) Genus Rhinichthys Agassiz, 1842.
<br />R. dulcis (Girard). Single species................... .p. 170
<br />EE. Premaxillaries propractile.
<br />
<br />(15) Gentls Apocope Cope, 1872.
<br />
<br />Three species from this genus have been recorded from Utah.
<br />
<br />a. Scales small, usually more than 70 in lateral line' head 4'
<br />snout 4; scales about 89 in lateral line. A. osc~la oscul~
<br />(Girard) ...................................... .p. 171
<br />aa. Scales larger, fewer than 70 in lateral line' snout 2 2/3'
<br />eye S to Sy,. A. adobe (Jordan and Everm'ann).. .p. 17i
<br />b. ScaIes la!"K"e, usually 52 to .65; body more slender, depth
<br />3~ to 5 In length. A. carnngtollii Cope.......... .p. 170
<br />
<br />Tanner: A Stud). of tlzr Fishes of Utah
<br />
<br />161
<br />
<br />(4) MEDIDAE
<br />
<br />The singlc gcnus in this family may be characteri~'ed as follows:
<br />
<br />A. Dorsal fin short, posterior, with a strong spine, composed of 2, the poste-
<br />rior receivcd into a longitudinal groove of the anterior; inner border of
<br />the ventral fins adherent to the body; teeth hooked, without grinding
<br />surface in 2 rows; body with small scales; teeth 2, 4-4, 2; no barbels.
<br />
<br />(If:) Genus Lepidomeda Cope, 1874.
<br />L. 7!ittata Cope. Single species in Virgin River draihage, p. 171
<br />
<br />(5) COTTIDAc,
<br />
<br />In this hmily we havc one genus in which we find:
<br />
<br />a. Preopercle with a spine at its angle and 2 or 3 spines below it; ventral
<br />fins with 4 soft rays.
<br />
<br />(1;) Genus Cottus Linn., 1758. .
<br />
<br />The two species may be separated by:
<br />
<br />a. \Vestern, intermountain species.
<br />b. Skin smooth; snout blunt ; caudal peduncle slender;
<br />anal rays II to 13. C. punctulatus (Gill)...... p. 172
<br />bb. Skin with prickles, especially about the pectorals;
<br />caudal peduncle deep. C. semiscaber (Cope).. .p. 172
<br />
<br />Illustrations
<br />
<br />Drawings and photographs are included for the purpose of assisting in
<br />the determination of the Utah species. If the Figures 1 and 2, Plate I, are
<br />studied in connection with the use of the keys, much time may be saved and
<br />most of the terms used in the keys will be explained.
<br />All species in Plate III have been introduced, all others are native species.
<br />
<br />Distributional List of the Native Species of Utah Fishes.
<br />
<br />In this list of species I have attempted-<< include many of the synonyms
<br />in order that the species may be followed in the older reports. The Jordan
<br />check list number is given, as this publication is indispesable in dealing with
<br />the fishes. The locality records are drawn only from the Brigham Young
<br />University collection. Various comments concerning taxonomic questions and
<br />interesting points relating to the species are included under remarks.
<br />
<br />. (1)
<br />
<br />FAMILY SALMONIDAE
<br />
<br />I. Genus Salmo Linnaeus (Trout)
<br />
<br />(341) Salmo utah Suckley. Utah Lake Trout.
<br />Plate I, Fig. 3.
<br />Salmo .tab Suckley, Monogr. Salmo, 1861 (1874), 136, Utah
<br />Lake; "Pale specimen from the Lake."
<br />
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