30. HTBORnYNCnUS. 181 



1. Pimephales promelas, 



Pimephales promelas, (Jicf.) Kirtlmul, Host. Jmtrn. Kat. Hist, iii- 



p. 475, pi. 27. fig. 2 ; Aijnss. Sill. Joi/rn. 18o5, xix. p. 220. 

 ? Pimephales maculosua, Girard, I'roc. Ac. Nat. Sc. Philad. 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. E.rpcd. Fish. p. 234. 

 Plargvrus melanocephalus, 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 eciuidistant between the end of the snout 

 and the root of the caudal, or somewhat nearer to the latter. Yen- 

 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 (in 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, probablj', season. Adidt males are stouter than females, 

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

 circular grooves. 



United States. 



a-<.L Adult. Mankato, Minn. Purchased 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 (Avithout caudal ). 

 Ventral fins reacliing 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 lino. {Co2)e.) 

 Grosse Isle ; Detroit River. 



3G. HYBORHYNCHUS. 

 Ilyborhvnchus, Ar/ass. Aiitcr. Jourii. Sc. iV Arts, 1855, xix. p. 222. 

 This genus difi'ers from Pinu'phalcs ui having the lateral line com- 

 plete. 



United States. 



