192 [September, 



slightly higher, and the highest of all. The veatrals are inserted in advance of 

 the anterior margin of the dorsal, and adherent to the ventral line for more than 

 the half of their total length. The caudal is deeply furcated. The pharyngeal 

 bones are slender, especially upon their inferior limbs, which are longer than 

 the upper ones. The latter are flattened or expanded, and curved inwardly 

 downwards. The teeth are very slender, subconical, compressed at their base, 

 of the prehensile kind of the hooked type, without grinding surface. They are 

 disposed upon a double series of one and four: 1 | 4 4 | 1. Thus, equally dis- 

 tinct from both Phoxinus and Phozinellus, to which this genus bears an external 

 resemblance. 



Thus far we are acquainted with but one species. 



Mbda fuloida. The head constitutes a little more than the fifth of the total 

 length. The angle of the mouth is even with a vertical line drawn in advance 

 of the orbit. The dorsal region is reddish yellow; the middle of the flanks as 

 if painted with silver; underneath pale yellow. 



From Rio San Pedro, tributary of the Gila ; collected by John H. Clark, under 

 Col. Graham, U. S. A. 



We now bring here together, under the name of 



CLIOLA, 



some species of small cyprinoids, having the external aspect of Dionda^ but 

 difl'ering from the latter by the pharyngeal teeth, which are curved, and without 

 grinding surface. The snout is rounded, the mouth small and terminal, with 

 both jaws equal. There is a rather wide isthmus. The eyes are well developed, 

 also. The dorsal fin is about as long as high, or longer than high. The caudal 

 fin is bifurcated; the insertion of the ventrals, opposite the anterior margin of 

 the dorsal. The scales being large, and the lateral line following the middle of 

 the flanks. The pharyngeal bones are of moderate strength ; the inferior branch 

 is rather slender, and nearly straight when viewed in front; from the insertion 

 of the teeth, they gradually expand to the entire convexity which is gentle and 

 gradual. The teeth themselves are of the raptatorial kind, of the hooked type, 

 without grinding surface, compressed, curved, and disposed upon one single row 

 of four: 4 4. 



1. Cliola viGitAX. Ceratichthys vigilax, B. & G., Proc, Acad. Nat. Sc. Phila. 

 vi. 1853, 390. Leuciscus vigilax, B. & G., in 3Iarcy^s Expl. of Red Riv. of La., 

 1853, 248. Zool. PI. xxiv. figs. 14. 



From Otter Creek, a tributary to the northern fork of Red River, Ark. 



2. Cliloa velox. A very slender and elegant species, differing from C. viffi- 

 lax, by a more conical head, much larger eyes, and larger scales. A black 

 spot may be observed upon the anterior margin of the dorsal fin. The ground 

 color is olivaceous, with the middle of the flanks silvery; a black vitta follows 

 the course of the lateral line. A black spot exists also upon the base of the 

 caudal fin. 



Specimens were collected by Dr. C. B. Kennedy, under Major W. H. Emory, 

 in the San Pedro creek, a tributary of the Rio San Antonio, Texas. 



3. Cliola vivax. This species might easily be mistaken for O. velox, were it 

 not for the shortness of its head and its small eye. Besides, the body is not so 

 much elongated, and is covered with scales a great deal smaller. The color is 

 uniform light yellowish or saffron, with a black spot upon the base of the caudal 

 fin, and another upon the anterior margin of the dorsal ; the middle of the 

 flanks exhibits traces of a greyish or blackish vitta. 



Caught in Leon River, a tributary to the Rio San Antonio, Texas, by Dr. C. 

 B. Kennerly, under Lt. A. W. Whipple, U. S. A, 



