31. CYPRINID.E - LEUCUS. 245 



/ 



a prominent raised prominence of the bone. Scales moderate. Lateral 

 line continuous, decurVed. Anal basis short. Abdomen not compressed. 

 Intestinal canal not elongate. Species numerous in Europe, Asia, and 

 America. This genus is very closely allied to the European Leuciscus 

 Cuvier, differing in the presence of teeth 5-5 or 5-4, instead of G-5 or 

 C-0. The name finally to be adopted for this group, if admitted as dis- 

 tinct, is uncertain, (l-uxoz, white.) 



a. Teeth 4-4,* with entire edges. (Algansea Girard.t) 



407. L. tincella (Val.) J. & G. 



Body stoutish. Head heavy. Mouth moderate, oblique, the maxil- 

 lary not reaching to the eye. Jaws about equal. Eye rather small. 

 Caudal peduncle thick. Fins small, the caudal short. Dorsal just over 

 ventrals. Scales quite small, firmly attached and not closely imbricated, 

 as in MylochiluSj etc. Coloration dark, plain; fins unspotted. Head3f; 

 depth 3f j scales 17-70-9; teeth 4-4. L. 6 inches. City of Mexico. 



(Leuciscus tincella, C. it V. xvii, 323; Giiuther, vii, 244.) 

 aa. Teeth 4-5, with entire edges. (Myloleucus Cope.t) 



408. L. obesus (Grd.) Jor. 



Body stout. Head short, the muzzle not decurved. Mouth small, 

 oblique, terminal, the lower jaw somewhat projecting, maxillary nearly 

 reaching to orbit. Eye 4| in head ; preorbital deeper than long. Color 

 dark ; the belly silvery ; the scales everywhere dusted with black specks ; 

 a dusky lateral baud. Head 3|; depth 3. D. 9; A. 8; scales 12-58-7 

 (13-58-9, Cope) ; teeth 5-4. L. inches. Utah Basin; abundant. 



(Algansea olesa Girard, Proc. Acad. Nat. Sci. Phila. 1856, 183, and U. S. Pac. R. R. 

 Surv. Fish. 239: Leuciscus obesus Giinther, vii, 244: Mylolcuctis pulverulentns Cope, 

 Hayden's Geol. Surv. Mont. 1871, 475, 1872; Jordan & Henshaw, Rept. Chief Eng. 

 1878, App. NN. 192.) 



409. L,. formosus (Grd.) Jor. 



Very close to the next, and perhaps identical with it. Body a little 

 more slender, the scales smaller, and profusely dotted with black as in 

 L. obesus. Head 3f ; depth 4. D. 8; A. 8; scales 10-53-6; teeth 5-4. 

 L. 4 inches. California. 



(Algansea formosa Girard, Proc. Acad. Nat. Sci. Phila. 1856, 183: Leuciscus formosus 

 Giinther, vii, 245; Jordan & Henshaw, 1. c. 193.) 



* In specimens examined ; the normal numher is probably 5-4. If permanently 4-4, 

 Algansea may be regarded as a distinct genus. 



t Girard, Proc. Acad. Nat. Sci. Phila. 1856, 184 : type Leuciscus tincella Val. (A coined 

 name.) 



tCope, Hayden's Geol. Surv. Mont. 1871, 475, 1872: type Myloleucus pulverulentus 

 Cope = Algansea olesa Girard. (yUvAoS, grinder; /letwd?, Leucus.) 



