5G, LEtJciscua. 247 



bb. Lateral line complete; phan/in/eal teeth 3 . 1—1 . 3 [?] (Tiarooa). 



54. Leuciscus cobitis. 



Tiarof.'a cobitis, Gu-arcl, Proc. Ac. Nat. So. Philad. 185G, p. 204: and 

 U. At. i,- Me.c: Pound. Ichthyol. p. UO, pi. 28. figs. 11-M. 



"Head sinaU, subconical, depressed. Mouth obliquely termiual, 

 of moderate size, and witliout barbels of any kind. Upper iaw 

 slightly loi'ger than the lower. Eye of medium size. Isthmus very 

 wide. Eody slender, subfusiform, compressed. Fins arc well deve- 

 loped; dorsal and anal narrow and high; caudal bifurcated. The 

 insertion of the ventrals takes place in advance of the anterior mar- 

 gin of the dorsal. The scales are smaU; the lateral line, medial. 

 Ihe pharyngeals are similar to those in Gohio. The teeth are like- 

 wise of the same character : slender, subcyhndiical upon their base 

 compressed above, of the raptatorial kind of the hooked type with- 

 out grinding siu-face, 1 . 3—3 .1. 



"About two inches and a half in total length, the head formiii- 

 about the fifth of it. The eyes approximate the upper surface of the 

 head which is rounded. The upper regions are brownish, ^ith 

 smaU blackish spots ; the inferior regions are unicolor of a yeUowish 

 tint._ A black spot upon the base of the caudal fin." 



llio San Pedro, a tributary of the Eio Gila. 



cc. Lateral line incomplete (Phoxiuus, sp.). 

 55. Phoxiuus neogaeus. 



Clirosomus eos, Cope, Proc. Ac. Nat. 8c. Philad. 1864, p. 281 Cnot 



iobl, p. 523). ^ ^ 



Phoxiuus neogtbus, Cope, Trans. Am. Phil. Soc. xiii. p. 875. 

 D. 8. A. 8. V. 8. L. lat. 77. 

 The height of the body is a little less than the length of the head 

 which IS one-fourth of the total (without caudal). Origin of the 

 dorsal fin nearer to the root of the caudal than to the end of the 

 snout. Snout shorter than the diameter of the eye, \vliich is two- 

 sevenths of the length of the head; mouth oblique, reaching to the 

 vertical from the orbit. Lateral line incomplete. Pectoral fins ter- 

 minating at a great distance from the ventral. A blackish band 

 along the lateral line, terminating in a black caudal spot. 

 Pharyngeal teeth 5 . 2—2 . 4. (Cojjc.) 

 New Hudson (Michigan). 



b. PharynfjeaHeeth in a single series (Pseudophoxinus, sp.). 

 56. Leuciscus erythrogaster, 



Luxilus erythrogaster, (Pajin.) Kirtland, Bod. Joiirn. Kat. IL'xf iv, 



1844, p. 23, pi. 2. fig-. 2. 

 Chrosomus erythrogaster, Cope, Trans. Am. Phil. Soc. xiii. p. 301. 

 D. 10. A. 9. y. S. 

 Scales minute. Upper jaw slightly overlapping the lower; max- 

 illary extending to below the front margin of the orbit : body tliick, 



