3a. (From 2a.) Melanophores on chin concentrated in narrow band at tip; anal rays usually 10 or 11; breeding males with prominete tubercles on head and predorsal regions.
mountain shiner
Lythrurus lirus

3b. (From 2a.) Melanophores on chin scattered and not concentrated at extreme tip; anal rays usually 11 or 12; breeding males with small tubercles on head and predorsal regions.
ribbon shiner
Lythrurus fumeus