1. CATOSTOMUS. 15 



fin extending beyond the vertical from the origin of the dorsal (in 

 male specimens ?) (Gir.) 



Rio San Pedro, tributary of the llio Gila. 



4. Catostomus guzmaniensis. 



Catostomus (Acomus) guzmaniensis, Girard, Proc. Ac. Nat. Sc, 

 Philad. 1850, p. 173, and in U. St. S)- Mex. Bowid. Survey, Ich- 

 thyol. p. 39, pi. 23. figs. (>-10. 



D. 14. A. 9. 



Scales very small. The height of the body is equal to the length of 

 the head, and contained four times and two -thirds in the total (with- 

 out caudal). Lips veiy thick, papillose, the lower bilobed. Eye small, 

 in the middle of the length of the head. The pectoral fu\ extends to, 

 or nearly to, the vertical from the origin of the dorsal. Back and 

 sides dark-coloured, with an orange lougitixdinal band. {Gir.) 



Janos River, tributary of Lake Guzman, Chihuahua. 



5. Catostomus plebejus. 



Catostomus plebejus, Baird Sf Girard, Proc. Ac. Nat. Sc. Philad. 



1854, p. '28. 

 Minomus plebejus, Girard, in U. St. ^- Mex. Bound. Survey, Ich- 



thyol. p. 38, pi. 22. figs. 1-4. 



D. 11. A. 8. L. lat. ca 80. 



The height of the body is nearly equal to the length of the head, 

 ■which is contained four times and two-thirds in the total (■«'ithout 

 caudal). Lower lip moderately bilobed. Eye of moderate size, a 

 little behind the middle of the length of the head. Snout elongate. 

 There are twenty-eight or thirty longitudinal series of scales between 

 the dorsal and ventral fins. Origin of the dorsal fin nearly midway 

 between the end of the snout and the root of the caudal. [Girard.) 



Rio Mimbres, tributaiy of Lake Guzman. 



6. Catostomus teres. 



Cypvinus catostomus, Peck, Mem. Amer. Acad. ii. pt. 2. p. 55, pi. 2, 



fig. 4 (not Forster). 

 ? Cj'prinus commersonnii, Lacep. v. pp. 606, 610. 

 CjT)rinus teres, Mitch. Lit. df Phil. Trans. New York, i. p. 458 



'tLesueur, Jo/urn. Ac. Nat. Sc. Philad. i. 1817, p. 108. 

 Catostomus communis, Lcsucur, Journ. Ac. Nat. Sc. Philad. i. 1817 



p. 95 ; C'uv.\4- Val. xvii. p. 426 ; Dekay, New York Fauna, Fish 



p. 190, pi. 33. fig. 106 ; Kirtland, Bost. Journ. Nat. Hist. v. p. 265 



pi. 19. fig 1. 

 bostouiensis, Lcsuerir, I.e. p. 106; Cue. &■ Val. xvii. p. 432. 



Storer, Peport Ichthi/ol. Massach. p. 84, and 3Ie>n. Amer. Acad. 



V. 1855, p. 290, pi. 22. fig. 3. 

 Cj'prinus (Catostomus) hudsonius, Richards. Faun. Bor.-Amer. Pise. 



p. 112 (uot sTOon.). 



( ) reticulatus, Richards. I. c. p. ,30.3. 



Catostomus palUdus, JJckay, I. c. p. 200, pi. 33. fig. 10-1. 



