652 ZOOLOGY— FISHES. 



head, 1.5 times in muzzle, and 1.75 in interorbital width. Length of head 

 3.6 in total length without caudal fin ; greatest depth nearly five times in 



the same. Caudal peduncle stout, Scales, ^ ; 23 rows in front of dorsal 



4 



tin. Radii: D. I. 8 ; A. I. 8 ; V. 8. The dorsal fin originates in front of 

 the line of the ventrals ; the latter nearly reached the anal, but are not 

 reached by the pectoral fins. Isthmus moderately wide. Color olive 

 above, white below ; a lead-colored band extending from the end of the 

 muzzle to the base of the caudal fin ; no basal caudal sj>ot. Fins unicolor. 

 Length, 2 inches. 



No. 



Locality. 



Date. 



Collector. 



361 



Arkansas River, at Pueblo 



Oct., 1S74 



C. E. Aiken. 



CEKATICHTHYS STEKLETUS, Cope, sp. nov. 



Plate XXVH, Figs. 3, 3a. 



A large-scaled species, well distinguished by its projecting muzzle, 

 slender caudal peduncle, and large fins. The general form is slender, the 

 greatest depth entering the total length six times ; the length of the head 

 entering nearly five times, or nearly four times without the caudal fin. 

 The least depth of the caudal peduncle enters that of the body nearly three 

 times. Teeth, 4-4. Barbels conspicuous. Muzzle very protuberant and 

 broadly rounded; end of maxillary bone not reaching line of orbit, Isth- 

 mus moderately narrow. Orbit 4.5 times in length of head ; 1.5 times in 



c 

 length of muzzle; 1.2 times in interorbital width. Scales, ra. Radii: D. I 



8 ; A. I. 7 ; V. I. 8. Ventrals reaching line of first dorsal ray, but not the 

 ventrals ; the latter reach the anal. Caudal long and deeply forked. 



In life this fish is silvery, with a few dusky scales ; no color bands 

 visible ; top of head from orbits forward pink. Length, m .075 ; length to 

 base of dorsal fin, ra .030 ; to basis of caudal, m .060. Not uncommon in 

 the Rio Grande at San Ildefonso. Taken by H. C Yarrow and E. D. Cope. 

 It is to lie compared with the C. (csiivalis (Gobio cestivalis, Grir.), from 

 Nuevo Leon, Mexico. 



