1856.] 175 



By a singular coincidence, this species received the same specific name from 

 two authors at a few weeks interval. 

 San Francisco, Cal. Dr. Newberry. 



4. Catostomus labiatcs, Ayres, Proc. Cal. Acad. Nat. Sc. i. 1855, 32. 

 Klamath Lake, 0. T. Dr. Newberry. 



5. Catostomus macrocheilus. This species is very different from both of the 

 preceding ones by a larger and more elongated head, a larger mouth, and hence 

 much larger lips, covered with large papillse. The scales which cover the body 

 are larger than in C. occidentalism and smaller than in C. labiatus. The head con- 

 stitutes the fifth of the total length ; the horizontal diameter of the eye is con- 

 tained nearly six times in the length of the side of the head. The head itself is 

 subquadrangularly pyramidal, truncated anteriorly with the upper edge of the 

 snout projecting. The anterior margin of the dorsal is a little nearer the end 

 of the snout than the insertion of the caudal fin. Its upper margin is concave. 

 The anal is well developed, for its tip extends beyond the base of the caudal. 

 The ventrals are inserted opposite the middle of the dorsal. The pectorals are 

 large and long. 



D 17 ; A 9 ; C 5, 1, 8, 8, 1, 6 ; V 10 ; P 18. 



Bluish black above ; yellowish golden on the sides and whitish beneath. 



Collected at Astoria, 0. T., by Lieut. W. P. Trowbridge, U. S. A. 



6. Catostomus sucklii. The head, as usual, forms the fifth of the entire 

 length. It is subquadrangular, the upper surface rather sloping towards the 

 blunt snout. The eye is small and subelliptical ; its horizontal diameter being 

 contained somewhat over five times in the length of the side of the head. The 

 anterior margin of the dorsal fin is equidistant between the tip of the snout and 

 the insertion of the caudal. Its height is equal to its length, and its upper 

 margin is slightly concave. The posterior margin of the caudal is deeply emar- 

 ginated, crescentic. The insertion of the ventrals is a little in advance of the 

 middle of the dorsal fin. 



D 14 : A 10 ; C 5, 1, 8, 8, 1, 4 ; V 10 ; P 18. 



The scales are large and but a little smaller anteriorly than posteriorly; they 

 are subelliptical in shape, longer than deep, with their anterior and posterior 

 margins irregiilar. 



Specimens of this species were collected by Dr. Geo. Suckley, under Governor 

 I. I. Stevens, in Milk River, an affluent of the upper Missouri. 



1. Catostomus bernardini. A specimen of seven inches and a half, slender 

 and graceful. The head forms a little less than the fifth of the total length. 

 The eye is large and subcircular ; its horizontal diameter entering a little over 

 four times in the length of the side of the head. The upper margin of the dorsal 

 is subconvex, the tips of the posterior rays reaching a vertical line which would 

 intersect the anus. The caudal is subcrescentic posteriorly. The ventrals and 

 pectorals are well developed. 



D 15 ; A 10 ; C 5, 1, 8, 8, 1, 5 ; V 10 ; P 16. 



Uniform purplish black above, yellowish white beneath. 



Specimens of this species were collected by Dr. C. B. Kennerly, under Major 

 W. H. Emory, at San Bernardino, in the upper waters of the Rio Huagui, west 

 of the Sierra Madre, Mexico. 



CHONDROSTOMI. 



This group must include a much greater number of genera and species than was 

 formerly anticipated. But, as a group, it must be based upon characters very 

 different from those derived from the structure of the mouth. Indeed, those 

 cartilaginous maxillary sheathes so prominent in Chondrostoma, Chondrochylus, 

 Chondrorhynchus and Lavinia, gradually become less and less conspicuous, until 

 we find but a thin pellicle, such as occurs in other groups of the same family. 

 The characters of Chondrostomi, as derived chiefly from the American representa- 

 tives, consist in the absence of barbels ; in the position of the mouth, which is 



