31. CYPRINHLE HYBORHYJS'CHUS. 151) 



milesi Cope, Proc. Acad. Nat. Sci. Pliila. 18G4, 282 (from Michigan, may be a distinct 

 species ; the scales said to be Lat. 1. 40, only three series between the lateral line 

 and the veutrals ; 5-7 usually in P. promelas) : Pimeplialcs agassizii Cope, Cypr. Penn. 

 394; Guuther, viij 181 : Pimephalcs milesil Giinther, vii, 181; Jordan, 288.) 



0. IIYBORHTNCHUS Agassiz. 

 (Agassiz, Amer. Jouru. Sci. Arts, 1855, 222: type Minnilus notatus Raf.) 



This genus differs from Pimepliales only in having the lateral line 

 complete. The maxillary is often provided with a rudimentary or obso- 

 lete barbel. (<5/?<5?, gibbous ; ^6770?, snout.) 



* Angle of mouth without trace of barbel. 



192. H. confertus Grd. 



Aspect of Pimepliales promelas. Body stout, the back moderately 

 convex. Head wide, formed as in the preceding species. Mouth term- 

 inal, very small, oblique. Eye 4 in head. Fins small. Lateral line 

 usually wanting on some of the scales along the sides. Color essentially 

 as in Pimepliales promelas, the males even darker ; the head black ; a 

 bread black band across the dorsal; borders of anal and border of 

 ventrals and pectorals black ; the lower fins said to be edged with white 

 in life; body somewhat mottled. Females more elongate, plainly 

 colored. Head 3f ; depth 3f. D. I, 8 ; A. 7 5 Lat. 1. 43; teeth 4-4. L. 

 2 inches. Arkansas Eiver to the Bio Grande; abundant. This species 

 is intermediate between Hyborhynclms and Pimepliales. 



(Hyborhynchus confertus ( 9 ) and Pimepliales maculosus ( $ ) Grd. Proc. Acad. Nat. 

 Sci. 1856, 180: Hyborhynchus nigellus Cope, Zool. Wheeler's Espl. W. 100th Mer. v, G71.) 



193. H. notaius * (Raf.) Ag. Blunt-nosed Minnow. 



Body rather elongate, not elevated, moderately compressed. Head 

 moderate ; the muzzle blunt and convex ; top of the head depressed. 

 Cheeks vertical. Mouth small, inferior, horizontal. Fins small ; the 

 dorsal moderate, the first ray distinct and spine-like in the male, slender 

 in the female. Anal small. Caudal fin short. Scales moderate, deep, 

 closely iubricated. Scales in front of dorsal small and crowded. Eye 

 moderate. Color olivaceous, little silvery; sides bluish; a black spot on 

 the dorsal fin in front, near the base ; a dusky shade at base of caudal ; 

 males in spring with the black on the dorsal more extended and the 

 head wholly black ; snout with about 14 disproportionately large tuber- 

 cles. Head 4 ; depth 5. D. I, 8 ; A. 7 ; scales 6-45-4 ; teeth 4-4. L. 

 4 inches. New York to Arkansas; generally abundant. 



(Minnilus notatus Raf. Ichth. Oh. 47; Giinther, vii, 182; Jordan, 238: Catostomus 



* Specimens agreeing closely with this species, but having the intestines no longer 

 than the body (as in Cochlognathus), have been lately sent us from Illinois River by 

 Professor Forbes. 



