1913.] NATURAL SCIENCES OF PHILADELPHIA. 47 



Known only from the type. Though united with Carpiodes 

 difformis by some writers, it is evidently a distinct species, as pointed 

 out by its describer. It differs chiefly in the position of the mouth, 

 which opens in front anterior to the nostrils, though its peculiar 

 snub-nosed physiognomy is very suggestive of Carpiodes difformis. 

 Carpiodes velifer (Rafinesque). 



One from the Wabash River, Indiana, and another from the 

 Blue River, Indiana?. 



Two examples from the Youghiogheny River, secured by Cope, 

 are the basis of the first definite record for the species in that stream 

 in Pennsylvania. 

 Carpiodes selene Cope. 



Proc. Amer. Philos. Soc. Phik., XI, 1870, p. 481. Root River, Michigan?. 



Nos. 6,647 (type) and 6,648, A. N. S. P., cotypes. Root River, 

 Michigan?. E. D. Cope. 



This appears to be a distinct species, and not at all identical 

 with Carpiodes thompsoni, as suggested by some writers. Its 

 affinities are with Carpiodes difformis and Carpiodes cutisanserinus, 

 as pointed out by Cope. 

 Carpiodes elongatus Meek. 



Four examples from Del Rio, Texas. These were WTongly iden- 

 tified by me as Carpiodes grayi Cope.^ 



NOTOLEPIDOMYZON subgen. nov. 

 Type Pantosteus arizonae (Gilbert) Jordan and Evermann. 

 Scales along predorsal region and back all well enlarged, less than 

 twenty between the occiput and origin of dorsal, and contrasting 

 with the small scales in the lateral line. 

 A single species, in the Gila basin. 



(/Voro?, back; ''-s-i9, scale; iJ-o'^dw^ to suck; with reference to the 

 large dorsal scales anteriorly.) 



Pantosteus arizonae (Gilbert) Jordan and Evermann. 



Eight from the Rio San Francisco in the Gila Basin, New Mexico. 



Pantosteus generosus (Girard). 



Two from the Weber River at Echo, and one from Logan, Utah. 

 Also two from "Western United States" (likely Utah?). 



Pantosteus plebeius (Baird and Girard). 



Catostomus plebeius Baird and Girard, Proc. Acad. Nat. .Sci. Phila., 1854, 

 p. 28. Rio Membres, basin of Lake Guzman, Mexico. 



No. 6,786, A. N. S. P., co-type of Catostomus plebeius Baird and 



3 Proc. Acad. Nat. Sci. Phila., 1904, p. 242. 



