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<br />1
<br />
<br />158
<br />
<br />Utah A[(Idl'1J1Y of Scicl/ces. Arls and I>ctltrs
<br />
<br />[Vol. XIlT 1936]
<br />
<br />Key to the Genera and Species of the above native families.
<br />
<br />(I) SALMONIDAE
<br />
<br />Three genera have been reported from Utah.
<br />
<br />A. Mouth deeply cleft; dentation strong and complete; scales vary froml
<br />large 140 to ISO, to small 170 to 200.
<br />
<br />(1) Genus SalolO L., 1758.
<br />
<br />The two species may be separated as follows:
<br />
<br />a. Scales 140 to ISO; spots sparse, pale color; Lake Bonne-
<br />ville Basin. Salmo utah Suckley...............,.. .p. 161
<br />aa. Scales 170 to 200; spots numerous, especially on posterior
<br />part; Colorado Basin. Sarmo plellritiws Cope..... p. 164
<br />
<br />AA, Similar to Prosopium but mouth is larger and longer jaws; the pre-
<br />maxillaries are vertical in position.
<br />
<br />(2) Genus Leucicbthys Dybowski, 1874.
<br />
<br />This genus is found only in Bear Lake in Utah and Idaho
<br />where it is represented by one species L, gemmifer Snyder. p. 164
<br />
<br />Tanner: /1 Study of the Fishes of Utah
<br />
<br />159
<br />
<br />a. Scales moderate, 80 to 90; mouth and lips moderate;
<br />dorsal rays usually 9. Lake Bonneville Basin. P. platyr-
<br />hynchus (Cope) ................................. p. 165
<br />Scales very small. 90 to 100 in lateral line, mouth large,
<br />with full lips; head short; tail slender; dorsal rays 9 to
<br />12. Colorado River Basin. P. vire sails Cope..... p. 165
<br />
<br />aa.
<br />
<br />Cc. Hinder division of air bladder broad.
<br />
<br />D. No hump back of head.
<br />
<br />E. Mouth inferior, with thick papillose lips; dorsal 11 or
<br />12; scales 9-64-74-8.
<br />
<br />(6) Genus Catostomus LeSueur, 1817.
<br />
<br />We are able to recognize but one species in this genus in Utah;
<br />hence C. ardens Jordan and Gilbert; also Chasmistes liorus
<br />Jordan are considered as synonyms for the present. Catostomus
<br />feeumius Cope and Yarrow.. .. .. .. .. .. .. .. .. .. . .. .. . .. p. 166
<br />
<br />DD. A high hump back of the head.
<br />
<br />(7) Genus Xyrauchen Eigenmann and Kirsch, 1888.
<br />Only one species. X. te.ronlls (Abbott)................ p, 167
<br />
<br />AAA, Mouth not deeply cleft; dentation feeble or incomplete; scales 78 to 87, (3) CYPRINIDAE
<br />
<br />(3) Genus Prosopium Milner, 1878.
<br />
<br />Three Utah species are known.
<br />
<br />a. Scales 74 to 81; head long; maxillary 4.1. P. spilonotus
<br />(Snyder) (Bear Lake only)....................., .p. 164
<br />aa, Scales 69 to i8; head shorter; maxillary 3.2. P. abyssieola
<br />(Snyder) (Bear Lake only)...................... p. 16
<br />aaa. Scales 8J to 90; head short, blunt; maxillary 2.8, broad.
<br />P. williamsoni Girard........ .................. .p. 164
<br />
<br />(2) CA TOSTOllIDAE
<br />Four genera have been reported from Utah,
<br />A, Dorsal fin with 9 to 18 rays.
<br />B. Scales small, 50 or more in the lateral lir.e; air bladder in two parts,
<br />C. Small species in the Rocky Mountain region; hinder division of
<br />the air bladder slender.
<br />
<br />(4) Genus Notolepidom)'%on Fowler, 1913.
<br />ON,. ODe .,ecia in this genus, N, utGhnuit Tanner.,., ,p. 165
<br />(5) Genus Panto.tea. Cope, 1875.
<br />Two species in this genus.
<br />
<br />Eight genera have been reported from Utah.
<br />
<br />A. Dorsal fin short, without developed spine; no anal spine.
<br />
<br />B. Maxillary without barbel; teeth 2-rowed, usually 2 teeth in the lesser
<br />row; teeth subconical, scarcely hooked, sharp-edged, wide apart, body
<br />elongate; mouth large; lateral line complete.
<br />
<br />(8) Genus Ptychocheilus Agassiz, 1855.
<br />
<br />This genus is represented by one species in the Green and Colo-
<br />rado Rivers. P. lueius Girard....................... .p. 168
<br />
<br />C. Teeth compressed, close-set, strongly hooked, ca,udal peduncle
<br />slender and elongate, the caudal fin widely forked; scales very
<br />small; head compressed in the adult.
<br />
<br />(9) Genus Gila Baird and Girard, 1853.
<br />
<br />One species of this genus from Utah in the University collection.
<br />
<br />a. Belly more or less fully scaled ; caudal peduncle not very
<br />slender, its depth 1 ~ in maxillary; scales of back and belly
<br />moder&tely reduced, G. ,.obtlsta Baird and Girard". .p, 168
<br />
<br />Cc. Teeth 1 rowed, 4-5- or 5-5; mouth of moderate size; teeth en-
<br />tire; body not much compressed; anal fin short in American
<br />species.
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