Jordan and Evermann. Fishes of North America. 231 



t. Scales in a longitudinal series 52 to 60 ; lateral line well developed, nearly complete, 

 o. Snout short and very blunt ; mouth small, not reaching orbit. MARGAEITA, 380. 

 oo. Snout subconical ; maxillary about reaching front of eye. ORCUTTI, 381. 



tin. Scales in a longitudinal series 40 to 45 ; lateral line more or lees developed. 



p. Caudal with a distinct black spot. MILNERIANUS, 382. 



pp. Caudal without distinct black spot. FLAMMEUS, 383. 



IOTICHTHYS,, (iwra, the smallest letter ; ix^s, fish ; from the small size.) 

 >M/ni. Scales in a longitudinal series about 36 ; no caudal spot ; no trace of lateral line. 



PHLEUETHONTIS, 384. 



Subgenus SIBOMA, Girard. 

 363. LEUCISCUS CRASSICAUDA (Baird & Girard). 



(SACRAMENTO CHUB.) 



Head4i; depth 3; eye 5. D. 8; A. 8; scales 9-56-7; teeth 2, 5-4, 2, usually 

 without grinding surface. Body short, deep, compressed, the antedorsal 

 region arched, the caudal peduncle nearly as deep as long, about as deep 

 as the head. Head conic, the profile steep, the muzzle short and rather 

 pointed. Mouth small, oblique, the jaws nearly equal; upper lip on the 

 level of lower part of pupil ; maxillary scarcely reaching front of eye; 

 isthmus very narrow ; preorbital nearly as deep as long. Eye small, ante- 

 rior. Fins low. Dorsal fin opposite ventrals, nearer caudal than snout ; 

 caudal fin short, little forked, scarcely broader than the very deep caudal 

 peduncle, the spines of the caudal vertebrae very strong. Scales large, 

 rather closely imbricated, their exposed surfaces rather deeper than long; 

 26 scales before dorsal. Lateral line decurved. Color brownish; sides 

 white ; young spotted above ; scales everywhere with dark dots ; fins plain. 

 Length 12 inches. Rivers of California ; generally abundant in the Sac- 

 ramento and San Joaquin. (crassusj fat ; cauda, tail.) 

 Leucisciis gibboms, AYRES, Daily Placer Times and Transcript, May 30, 1854, San Francisco, not 



of Storer, 1845. 



Lavinia crassicauda, BAIRD & GIRARD, Proc. Ac. Nat. Sci. Phila., 1854, 137, San Joaquin River. 

 Tigoma crassa,* GIRARD, Proc. Ac. Nat. Sci. Phila., 1856, 207, Sacramento River. 

 Siboma crassicauda, GIRARD, Proc. Ac. Nat. Sci. Phila., 1856, 208, and Pac. K. B. Surv., x, 296^ 



1858. 



Leuciscm crassicauda, GUNTHER, Cat., vn, 243, 1868. 

 Squaliux yibbosus, JORDAN & GILBERT, Synopsis, 239, 1883. 

 Squalim crassus, JORDAN & GILBERT, Synopsis, 241, 1883. 



Subgenus TIGOMA, Girard. 

 364. LEUCISCUS CONFORMIS (Baird & Girard). 



Head 3; depth 3i; eye 5. D. 8; A. 8; scales 9-52-5. Body robust, rather 

 elevated. Head moderate, the mouth rather small, oblique ; maxillary not 

 quite reaching eye. Eye mod- rate. Dorsal fin considerably behind ven- 

 trals. Scales large; lateral line decurved. Purplish brown above, yel- 

 lowish below. Length 4 inches. Tulare Valley, California; only the 

 types known; apparently close to L. crassicauda, but with larger scales; 

 perhaps the young of the same species, (conformis, uniform.) 

 Lavinia conformis, BAIRD & GIRARD, Proc. Ac. Nat. Sci. Phila., 1854, 137 ; Poso Creek, Tulare 



County, California. (Coll. Heermann.) 

 Tigoma conformis, GIRARD, Pac. K. K. Surv., x, 289, 1858. 

 S<jnalius conformi*, JORDAN & GILBERT, Synopsis, 237, 1883. 



~*Teeth with narrow grinding surface; scales 10-57-7; head 4 ; depth 3%, in Girard's type, 

 which was 10 inches long. (Coll. Dr. J S. Newberry. ) 



