122 Zoology of Colorado 



characters of the remaining Cyprinidae, the reader must be re- 

 ferred to Ellis, but some of the more interesting may be briefly 

 mentioned. The Red-bellied Dace (Chrosomus erythrogaster da- 

 kotensis*), known by the two parallel blackish stripes along each 

 side, is a beautiful fish, the males in the breeding season splendidly 

 ornamented with red. Evermann's Dace (Richardsonius ever- 

 manni of Juday) is known only from three specimens collected 

 by Juday in Boulder Creek near Boulder. Since that time the 

 fishes in the creek have been killed wholesale by outpourings 

 from the mines or mills, and continued search has failed to bring 

 another specimen to light. The same is true of the small No- 

 tropis universitatis of Evermann and Cockerell. This fish, known 

 by the pale orange dorsal band on a bright straw-yellow ground, 

 was considered to be related to N. zonatus of the Ozark region of 

 Missouri and Arkansas.** One specimen was found in Boulder 

 Creek at a time when the fishes were killed by mine waste, and 

 none has been seen since. It seems probable that these two 

 species are extinct in Boulder Creek, but we may hope that they 

 survive elsewhere. Another of our Notropis (N. horatii from 

 Julesburg) is also known by a single specimen, now in the U. S. 

 National Museum. Ellis searched for it at Julesburg, without 

 success, and the species must be considered somewhat doubtful 

 until more specimens are found. The species Ellis and Hender- 

 son got at Julesburg were N. cornutus of Mitchill, N. deliciosus of 

 Girard, (N. scylla of Cope), and N. piptokpis of Cope, from all 

 of which N. horatii appears to differ by having the head 5.2 in 

 length to base of caudal, and anal rays nine combined with an 

 elongate body. N. cornutus is a more compressed fish, with a 

 deeper body than the others, especially, when adult.*** Ellis 

 records only two native Cyprinidae from the Rio Grande drain- 

 age in Colorado. These are Rhinichthys, already mentioned, 

 and the Rio Grande Chub (Richardsonius pulchellus). The former 

 has a curiously pointed snout in lateral profile, and the mouth is 

 like that of a sucker. The latter is a more ordinary looking fish, 

 without sucker-like mouth; the back is dark steel blue, and be- 



*Dr. Hubbs states that the supposed subspecies dakotensis is not separable. 



♦♦According to Dr. Hubbs, who has examined the type, this is a peculiarly colored in- 

 dividual of N. cornutus frontalis, with which the tooth and fin characters (teeth 2, 4-4, 2, dorsal 

 rays 8, anal 9) agree. 



***Dr. C. L. Hubbs refers all the Colorado N. cornutus to a subspecies N. cornutus frontalis 

 of Agassiz, orginally described from Lake Superior. 



