Cope.] ^"^ [June 7, 



Scales 5-39 |, eye 4.2o to 4.5, less than length muzzle ; head wide, en- 

 tering length 4.66 times ; A. 8. H. ktjchalis. 



II. Suborbital bones long, slender ; speculum on postfrontal region 

 little marked. 



Scales 6—38—4 ; head 4.75 times in length, wide ; eye large 3 times 

 in head, larger than length muzzle ; A. 7. 



H. OSMERINUS.* 



Scales 5-6 36 3-4 ; head narrow 4.25 times in length ; eye large, 



diameter exceeding muzzle, 3.3 times in head ; A. 8. 



H. AKGYKITIS. 



58. Hybognathus argykitis, Girard. 



Proc. Acad. Nat. Sci., Phila., 1856, 182. U. S. Pac. 11. R. Surv., vol. 

 X, Tab. 



This species was described by Dr. Girard, from specimens obtained by 

 the U. S. Explorations for the Pacific Railroad route, from the Milk and 

 Arkansas Rivers. It appears to be very abundant in the Catawba River, 

 North Carolina. Specimens from it cannot be distinguished from those 

 from the Arkansas in the Museum of the Smithsonian Institution. 



CAMPOSTOMA, Agass. 

 59. Campostoma akomaltjm, Raf. 



liutilus Raf., Gampostoma, Agass. 



From the Cumberland, Clinch and French Broad Rivers, west of the 

 Alleghenies and the Catawba River east of them. 



CATOSTOMID^. 



Prof. Gill proposed to distinguish this group from the Cyprinidse as a 

 family (in Proc. Acad. Nat. Sci., Phila., 1861, p. 8), basing the latter 

 on the peculiar characters of the pharyngeal bones and teeth. This 

 course has not been followed by subseqiient writers, and the character 

 assigned does not appear to me to warrant the proposed separation. I find, 

 however, that while the premaxillary bone completes the superior arch of 

 the mouth in the Cryprinidse, in the Catostomidse, those bones form but a 

 slight portion of the same, the maxillary bones entering into it extensively 

 on each side. This feature is evidently of imjDortance sufficient to define 

 the family, and I therefore adopt it as left by Prof. Gill. 



*Hybognathus osmerin'us. Cope spec. uov. 



The characters of this species are expressed in the above table. It is very near the. H. avgyritis 

 Gir.,but has a materially shorter head and smaller anal tin. The head is relatively Avlder. The 

 preorbital bone is about as long as deep. The mandible very attenuate, and vi'ith a slight 

 symphyseal tubercle. End of maxillary not beyond line of posterior nares. Orbit large. D. I. 8. A. 

 1.7. (H. regius has II— 9 A., according to Girard.) Total length .31.2 lines; of head :5 1. ; to basis 

 dorsal 12.5 1. ; to basis caudal 12.7 1. Pectorals and ventrals very short ; flrst articulated dorsal ray 

 6 lines long. A broad silver lateral band ; bright olive above it. pale below it: no black spot on 

 basis caudal. Speculum on postfrontal region small and little visible. 



This species is abundant in the Karitan River, New Jersey, in early spring ascending the river 

 with the smelt (Osmerus). Discovered by my friend, Dr. Chas. C. Abbott, of Trenton, who is 

 investigating the ichthyology of New Jersey. 



