1. CATOSTOMrS. 17 



Snout scarcely projecting beyond the mouth. Eye small. Scales 

 on the fore part of the trunk equal in size to those on the tail. 

 Lakes Erie and Superior. 



8. Catostomus occidentalis. 



Castostonius occidentalis, Ayres, in I'ruv. Calif. Ac. Nat. Sc. i. 18o4, 

 p. 18 ; Af/assiz, in Amcr. Junrn. Sc. i>,- Arts, xix. 18o4, p. 94 ; Girard, 

 in U. S. 'p. It E. Expcd. Fish. p. 224. 



Closely allied to C. teres. 



D. 14. A. 8-9. L. lat. 70. L. transv. i^j^. 



The height of the body is less than the length of the head, wliirh 

 is contained four times and three-fourths in the total (without 

 caudal). Lips broad, slightly papillose, the lower deeply bilobate. 

 Eye small, but little behind the middle of the length of the head ; 

 suborbital narrow, much narrower than the fleshy part of the cheek 

 below it. There are nine or ten longitudinal series of scales between 

 the lateral line and the root of the ventral. Scales on the fore part 

 of trunk much smaller than those on the tail. Origin of the dorsal fin 

 a little nearer to the end of the snout than to the root of the caudal. 



California. 



(i~h. Adult. San Francisco. Presented by W. 0. Ayres, Esq., M.D. 

 9. Catostomus bemardini. 



Catostomus bemardini, Girard, Proc. Ac. Kaf. Sc. Philad. 1856, 

 p. 17.J, and in U. St. S,- Mex. Bound. Survey, Ichthyol. p. 40, pi. 23. 

 tigs. l-o. 



This species is but little known, and very doubtful. 

 D. 14. A. 9. 



Apparently closely allied to C. teres, but with the eye larger and 

 in the middle of the length of the head (according to figure). Scales 

 apparently of the same size as in C. teres, those on the fore part of 

 the tnink being smaller than those on the tail. The height of the 

 body is nearly equal to the length of the head, and two-ninths of the 

 total (without caudal). Lips very thick, papillose, the lower deeply 

 bilobate. (Gir.) 



San Bernardino, in an afilucnt of the river Huagui, Mexico. 



10. Catostomus nigricans. 



Catostomus vigricans, Lcsiuur, I. c. p. 102; Kirtland,Bost. Jount. Nat. 

 Hist. V. p. 273, pi. 21. tig. 3. 



maculosus, Lesueur, I. c. p. 103. 



fasciolaris, flexuosus, niegiistomus, xanthopus, Pajinesque. 



Exoglossuui macropterum, Rafuicsque. 

 Hypenteliimi macropterum, Pajinesque. 

 Catostomus planiceps, Cuv. 4" Val. xvii. p. 450, pi. 'TIG. 

 Hj-lomyzon nigi-icans, Ayassiz, I. c. p. 90. 



D. 13. A. 8-9. L. lat. 48. L. transv. ^;9. 



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



