168 UNIVERSITY OF COLORADO STUDIES 
Only one distinct lateral dark band, ornone . . : ee eal ie 
1. Mouth inferior, with rounded corners and fickeristl lis, eateerike Sie 7: 
Mouth ordinary . . Bere EAR de 
2. Anterior end of dorsal coaanieneiety borane anterior a of ventrals; scales large; 
snout in lateral view truncate; lips papillose; no barbel . . Phenacobius scopifer. 
Anterior end of dorsal level with or posterior to anterior end of ventrals 3. 
Dorsal without a band; scales small; size rather small; often a small barbel. 
r Rhinichthys cataracte dulcis. 
Dorsal with a black or gray band; scales large; size larger, to over 120 mm.; sides 
mottled with gray. . . . «+  Compostoma ononaten 
[Length of ventrals hardly ora fia fice Berauce from tips of pectorals 
Campostoma anomalum. 
Length of ventrals much greater than their distance from tips of pectorals 
Phenacobius and Rhinichthys.} 
danny 
yy oY) 
Fic. 5—Rhinichthys dulcis. 
Tips of ventrals reaching base of anal. . . . . Me ee in ba" Vobe Ae 
Tips of ventrals not (usually not eae hes base of anal seca) sve 
Body Gee.) sah) 3 Virani tags cs Lo aaa 
Body not so deep; deat with no flack ect in Bones . . .  Notropis cayuga. 
A black spot at base of dorsal; lateral line very incomplete; color above very dark; 
length about 70 mm. depth about 16mm.. . . . . .  Pimephales promelas. 
No black spot on‘dorsal . . . . . - - + « « + + Notropis lutrensis. 
[Notropis piptolepis varies, so that tips of ventrals may reach base of anal, or miss 
it by a short interval.] 
Scales large, 10 to 12 (8 in N. scylla) in oblique line from dorsal to ven- 
treads.) ein tes : ‘ SD OR Hin) & ARO, Breads Ete: 
Scales moderate, 13 to 14 in auiaae line), 2.) sa) iL ey Benerseuslevermann. 
Scales small, 15 or more in oblique line . . BEC 2 ake ch 
Eye smaller and snout longer, so that distance hoe eye to tip ae snout is nearly twice 
diameter ofeye . . . . . « Hybopsis kentuckiensis. 
Eye larger and snout tories, so ‘that images. from eye to tip of snout is not nearly 
twice diameter of eye, or is little more than once diameter . . Q. 
In lateral profile, height of eye about equal to, or a trifle less than, Rani dace from eye 
to nearest point on lower marginof head . . . . . . «. WNotropis cornutus. 
