Jordan and ETcrmann. — Fishes of North America. 233 



fishes, especially to young trout. Varies greatly with age and surround- 

 ings. The present description is taken primarily from Utah Lake speci- 

 mens, typical of L. atrarins. We have examined specimens from Utah 

 Lake, Provo River, Bear River, Jordan River, Sevier River, Heart Lake, 

 and Jackson Lake, Wyoming, and other streams tributary to Snake River.* 

 {lineatus, streaked, a character usually not conspicuous, and produced by 

 the paler centers of the scales contrasting with the dotted edges.) 



Tigoma lineala, Giraro, Proc. Ac. Nat. Sci. Phila., 1856, 200 ; locality unknown, type lost. 



(Coll. Bockwith.) 

 Tigamaobesa, GiRARn, Proc. Ac. Nat. Sci. Phila., 185G, 206, Salt Lake Valley; anil Pac. R. R. 



Surv., X, 290, 1858 ; the name (iheaii.i preoccupied in Leiiciiciis. (Type, No. 2773. Coll. Bow- 

 man.) 

 Siboma atraria, Giraro, Proc. Ac. Nat. Sci. Phila., 1S5G, 208, Utah District near the Desert, 



(Coll. IJeckwitb) ; and Pac. II. R. Surv., x, 297, 1858. 

 Tigoma sgnamata, Gii.i,, Proc. Bost. Soc. Nat. Ilist., 1861, 42; and Ichth. Capt. Simpson's Expl., 



1876, 405, Salt Lake Basin ; a very deep-bodied example; scales 10-50-3. (Type, No. 2607. 



Coll. C. S. JlcCarthy.) 

 P)-otoporits doiniiiuns, CoPE, Hayden's Geol. Surv. Mont, for 1871, 473, 1872, Snake River, Fort 



Hall, Idaho, (Coll. Carrington); a very young example with incomplete lateral line and 



teeth 2,4-4, I; scales 9-56-0; Jordan AGilrert, Synopsis, 203, 1883. 

 HijbopsishiviUalus, Cope, Hayden's Geol. Surv. Mont, for 1871, 1872, 474, Warm Springs, Utah, 



(Coll. Carrington); young with teeth 2, 4-4, 2 ; scales 12-53-11. 

 Hybopsis liiiiptmrigeiiKis, CoPE, Proc. Anur. Philos. Soc. Phila., 1874, 134, Timpanogos, Utah; 



young with incomplete lateral line ; scales 13-52-2, and teeth 2, 4-4, 2. (Type, No. 15769. 



Coll. F. Klett); Cope & Yarrow, Zoiil. Wheeler Surv., 654, 1875. 

 Sihoma alraria, and variety hmyicepx,\ Cope, Zoiil. Wheeler Surv., 607, 1875, (1876), Snake Creek 



Valley, Nevada, near the Utah line, and near the Sevier Basin, belonging to 



the drainage of Lake Bonneville. (Type, Nos. 12910, 15770, 15782. Coll. Yarrow; 



C. G. Newberry.) 

 ' Squaliiis rhomaleiis, Jordan & Gilbert, Proc. U. S. Nat. Mus., 1880, 461, very old; scales 10-55-5, 



Utah Lake. (Coll. Jordan.) 

 Sqiialiiis oHorfd.'i, Jordan & Gilbert, I. c, 400, 1880, Provo River; scales 11-50-G ; young. 



(Type, No. 30806. Coll. Madsen.) 

 Miuuiliis birittatiis, Jordan & Gilisert, Synopsis, 195, 1883. 

 Miimiltis iimpunogensis, Jordan & Gilbert, Synopsis, 190, 1883. 

 Squalitis ci-uorem and rlionudevs, Jordan & Gilbert, Synopsis, 234, 240, 1883. 

 Sqiialius lineatus, Jordan & Gilbert, Synoi),sis, 230, 1883. 

 Squalitis obesus, Jordan & Gilbert, Synopsis, 237, 1883. 



Squalim atrarim, Jordan & Gilbert, Synopsis, 241, 1883 ; Jordan, Bull. U. S. Fish Comm., 1889, 33. 

 Squalius squamattis, Jordan & Gilbert, Synopsis, 241, 1883. 



367. LEUCISCUS NIGBESCENS (Girard). 

 (Pescadito; Chub of the Rio Grande.) 



Head 4i; depth 4|; eye about 6. D. 8; A. 8; scales 15-67 (60 to 67)-10; 

 teeth 1, 4-4, 1, or 1, 4-5, 2, usually without grinding surface. Body rather 

 slender, little compressed. Head rather long and pointed. Mouth moder- 

 ate, oblique, terminal, the jaws about equal, the maxillary about reach- 

 ing front of eye. Eye rather small. Scales moderate. Lateral line 

 decurved. Fins large; dorsal behind veutrals, its tip when depressed 

 reaching the posterior base of the anal; pectorals nearly reaching ventrals. 



♦This species has been attributed to Lake Tahoe, apparently by error, RulHus olivacetts having 

 probably been mistaken for it. 



fThis variety is said to differ fnim tlic typical form in liaviiit; the head lunger and the scales 

 larger. Scales 12-56-5. 



