272 Field Museum of Natural History — Zoology, Vol. VII. 



length of body; peritoneum silvery; origin of dorsal slightly in ad- 

 vance of ventrals, nearer tip of snout than base of caudal ; lateral line 

 usually complete; scales 15 or 18 in series before dorsal. 



Color pale olivaceous, silvery below; a dark lateral band, usually 

 a large caudal spot. 



Length 4 to 6 inches. 



This fish occurs in the larger streams and lakes from North Da- 

 kota to Quebec and Missouri. 



Fox River, McHenry, Illinois; Lake Michigan, Chicago, Illinois; 

 Des Plaines River, Berwyn, Illinois; Wolf Lake, Roby, Indiana; 

 Lake Michigan, Pine, Indiana; Lake Michigan, Edgemoor, Indiana. 



Notropis whipplii (Girard). Steel-colored Mixnow; Silverfin. 



Head 3.9 to 4.2 ; depth 3.6 to 4.4; D. 8; A. 8 or 9; scales 36 to 39. 



Body elongate, considerably compressed; head small, subconic; 

 mouth moderate, terminal, oblique, the tip of upper lip on level with 

 lower margin of the pupil ; maxillary scarcely reaching eye ; its length 

 3.1 to 3.6 in head; snout pointed, 2.8 to 3.2; diameter of eye 3.9 to 

 4.8; teeth 4-4 or i, 4-4, i, the edges crenate; alimentary canal shorter 

 than the body; peritoneum silvery; origin of dorsal fin a little behind 

 ventrals, a little nearer base of caudal than tip of snout; 14 or 16 

 scales in series before dorsal fin ; lateral line complete, decurved 

 anteriorly. 



Color olivaceous, bluish above and on sides, silvery below; two 

 dark blotches on posterior membranes of dorsal fin. Breeding males 

 with tips of caudal and anal satin white; lower fins lemon- yellow. 



Length 3 to 4 inches. 



This minnow inhabits clear water from Minnesota to the St. Law- 

 rence, Virginia, and Arkansas. 



Notropis cornutus (Mitchill). Common Shiner. 



Head 3.8 to 4.2 ; depth 3.3 to 4.4; D. 8; A. 9 or 10; scales 37 to 40. 



Body elongate, compressed; head large, snout pointed to bluntish; 

 mouth large, oblique, the tip of upper lip above lower margin of orbit; 

 maxillary scarcely reaching front of orbit, its length 2.9 to 3.2 in head ; 

 snOut 2.8 to T,.;^; teeth 2, 4-4, 2, with narrow grinding surface; ali- 

 mentary canal i.o to 1.5 times length of the body; dorsal fin slightly 

 in advance, of ventrals and nearer tip of snout than base of caudal ; 

 lateral line complete; scales on sides much deeper than long, about 

 16 to 25 in a series before dorsal fin. 



Color olivaceous above, silverv below; a faint lateral band, no 



