PLECTOSPONDYLI CYPE1NIDAE M. TPJSIGNATUM. 



679 



fishermen, but they meet with a ready sale in winter at an average price of 

 2 cents per pound. 



CATOSTOMUS GUZMANIENSE, Girard. 



Catostomus (Acomus) guzmanicnsis, Gin., Proc. Acad. Nat. Sci. Phila., viii, 1856, 173. 

 Acomus guzmanicnsis, GIE., U. S. & Mex. Bound. Surv., ii, pt. ii, 1859, Ichthyology, 39. 



We find in the collection a specimen which corresponds with Girard's 

 species known as Acomus gusmaniensis, the type of which was procured in 

 the Janos River, a tributary of Lake Guzman, Chihuahua. The specimen 

 under consideration was procured at Lake Utah, Utah, in 1872, and has 

 been overlooked until lately. This species has a fontanelle, and is conse- 

 quently a true Catostomus. It resembles C. latipinnis, Gir., but has -larger 

 scales, especially on the dorsal region. 



MOXOSTOMA, Raf. 

 MOXOSTOMA TEISIGNATDM, Cope, sp. nov. 



Represented by numerous specimens from the Upper Arkansas River, 

 none of which are mature. It is therefore possible that in adults the lateral 

 line of tubes may be developed, in which case this species will be referred 

 to the genus Catostomus. 



The head is rather large, as in other Moxostonuc, and is wide above and 

 square. The dorsal outline is very little arched, although the body is not 

 slender. Head 3.4, depth 4 times in length without caudal fin ; muzzle 

 not produced ; mouth small ; lips full, tubercular ; scales a little smaller 



