36. HYB0RHTNCHU3. 181 



1. Pimephales promelas. 



Pimephales promelas, {Raf.) Kirtland, Bost. Jaum. Nat. Hist, iii- 



p. 475, pi. 27. tig. 2 ; Ayass. Sill. Journ. 1855, xix. p. 220. 

 ? Pimephales raaculosus, Girard, Proc. Ac. Nat. Sc. PhUacl. 1856, 



p. 180 ; or in U. S. Pac. R. R. Exped. Fish. p. 284. 

 Pimephales fasciatus, Girard, Proc. Ac. Nat. Sc. Philad. 1856, p. 180; 



or in U. S. Pac. R. R. Exped. Fish. p. 234. 

 Plargyo-us mel^uocephalus, Abbott, Proc. Ac. Nat. Sc. Philad. 1860, 



p. 325. 



D. 1/7. A. 8. V. 8. L. lat. 45-46. L. transv. 9/9. 



Similar to a Minnow in general appearance ; snout short, blunt, 

 convex, scarcely longer than the diameter of the eye, which is one- 

 fourth of the length of the head ; the latter is one-fourth of the total 

 length (without caudal). Interorbital space flattish, broad ; sub- 

 orbitals very narrow. The origin of the dorsal fin is a little behind 

 that of the ventral, and equidistant between the end of the snout 

 and the root of the caudal, or somewhat nearer to the lattei*. Ven- 

 tral fin extending to or somewhat beyond the vent ; caudal fin 

 emarginate- There are five longitudinal series of scales between the 

 lateral line and ventral fins. Head black (iu adult males) ; dorsal 

 fin with a blackish spot in front and behind. 



This species appears to vary considerably in form according to sex, 

 age, and, probably, season. Adult males are stouter than females, 

 which have a narrower tail. IMales have the snout covered with large 

 circular grooves. 



United States. 



a-d. Adult, ilankato, Minn. Pinchased of 0. Salvin, Esq. 



2. Pimephales milesii. 

 Cope, Proc. Ac. Nat. Sc. Philad. 1864, p. 282. 



D. 1/9. A. 8. L. lat. 40. L. transv. 7/ ?. 

 Mouth oblique ; the diameter of the eye is two-ninths of the 

 length of the head, which is one-fourth of the total (without caudal). 

 Ventral fijis reaching to anal ; origin of the dorsal fin a little nearer 

 to the base of the caudal than to the end of the snout. Three longi- 

 tudinal series of scales between the lateral line and base of ventral. 

 Body with a faint blackish longitudinal line. (Coj)e.) 

 Grosse Isle ; J)etroifc River. 



36. HYBORHYNCHUS. 



Hyborhynchus, Agass. Ainer. Journ. Sc. i<f- Arts, 1855, xix. p. 222. 



This genus differs from Pimephales in having thq lateral line com- 

 plete. 



United States. 



