38 PRELIMINARY REPORT 



Notropis rubrifrons (Cope). 



Olivaceous above; the sides silver}' ; scales with dark edges; 

 a dark dorsal stripe; a dark dotted line at the base of the anal fin; 

 head of the spring males tuberculate; the top and sides of the head 

 and base of the dorsal fin red. Body long, the back not elevated. 

 Head pointed, the mouth rather large and very oblique. Head con- 

 tained 4 times in the length. Depth 4f. Eye 4. Dorsal fin with 8 

 rays. Anal 10. Scales 5-39-3, with 15 to 17 before the dorsal. 

 Length 2f inches. A fish much like N. atherinoides and N. dilectus. 

 Rather common. Specimens have been taken in the various streams 

 and lakes in the Upper Mississippi (Nat. Hist. Surv., 1892-3-5) ; and 

 in the Des Moines River at Windom (Cox, 1894), 



Notroijis iinibratilis (Girard). 



Color dark blue above, light below; a black spot at the base of 

 the front of the dorsal fin; the other fins not marked. Head of 

 the males tuberculate, which tubercles are of a light color. Body 

 compressed; head long and pointed, mouth large, oblique; lower 

 jaw projecting a little. Head contained 4^ times in the length. 

 Depth 4 to 4:^. Eye about as wide as the length of the snout, con- 

 tained 3 to 4 times in the head. Dorsal fins inserted about midway 

 between the ventral and anal fins, contains 7 rays. Anal with 11 

 rays. Scales 9-40 to 52-3, Teeth 2, 4-4, 2. Length 3^ inches. This 

 is a variable minnow, and at present seems rare in Minnesota, It 

 is reported from the Cedar River at Austin as rare under Notropis 

 ardens (Cope) (Meek, Bull, U. S, Fish Comm., X, 1890, p, 234). Min- 

 nesota specimens, no doubt, belong to one of the several varieties 

 described in Jordan & Evermann's Fishes of North and Middle 

 America, to which reference should be had in identification. 



Genus RHINICHTHYS (Agassiz). 



KEY TO THE SPECIES OF RHINICHTHYS. 



A. Snout projecting considerably beyond the mouth, about twice 



the length of the eye; a barbel present on the maxillaries. cataractse, 38 

 AA. Snout not projecting much beyond the mouth; about li times 



the eye; barbel very small or absent. , . . atronasus, 39 



Rhinicbtbys cataractse (Cuvier & Valenciennes). Long-nosed Dace. 



Snout long and projecting considerably beyond the mouth; a 

 barbel on each maxillary. Color somewhat olivaceous above, lighter 

 below; many dark blotches present; the back dark brown or even 

 black in some specimens. Spring males with parts of the head and 



