I70 UNIVERSITY OF COLORADO STUDIES 
Base of dorsal level with or posterior to base of ventrals PUP sida fyb Ty trae 
2. A very distinct black spot at base of caudal; size rather large, 75 mm. N. scylla. 
(Still larger, but with no spot at base of caudal . . . . . . WN. cornutus.) 
No distinct spot at base of caudal; our specimens smaller, 70 mm. or less 3. 
3. A very distinct black band from snout to eye, and continuing behind eye WN. cayuga. 
No such black band, or at most vestiges of it, behind eye only . . . 4. 
4. Astrong black dorsal band, on a grayish-yellow ground; the scales dusky-margined 
by copious dots; sides more or less silvery; broad, breadth 9 or 10 mm. in fish about 
wom. LONG: “ii. ih. Oe) I N. piptolepis (see here also cornutus when young). 
A pale orange dorsal band on a bright straw-yellow ground, the scales minutely 
black-dotted, but not appearing dusky-margined; sides strongly silvery; lateral line 
complete; a grayish lateral stripe; dorsal and caudal fins yellowish; dorsal black 
speckled; D 8, Ag (not counting rudimentary anterior ray); a crest above each 
nostril; chin black-speckled; scales 8 or g—38-5, 12 before dorsal in lateral line; form 
narrow, breadth 6 mm. in fish about 65 mm. long. (Boulder Creek, Boulder, Nov. 
LOOT Mie) Ge . . . Notropis zonatus (Agassiz), var.? 
The recorded aheky Motes pepe are as follows: ; 
Campostoma anomalum Raf. Colo., Wyo. 
Chrosomus erythrogaster Raf. Colo. 
Hybognathus nuchalis Agass. Colo., Mont. 
H. argyritis Girard. Milk R. Mouth wider than in muchalis; may intergrade. 
H. (Dionda) serena Girard. PecosR. D8,A8. Scales 5-32 to 34-3. 
H. (Dionda) episcopa Girard. Pecos R. D8,A8. Scales 9-37 to 41-4. 
The name is in punning allusion to Capt. Pope, its discoverer. 
H. (Dionda) nubila Forbes. Wyo. D8, Ag. A dark lateral band. 
H. (Dionda) amara Girard. Rio Grande (doubtful species). D8,A7. No dark 
lateral band. 
Pimephales promelas Raf. Colo., Mont., Rio Grande, Yellowstone R. 
P. promelas maculosus Girard. Arkansas R. at Pueblo. Lateral line better devel- 
oped, the pores wanting on less than half of the scales. 
P. promelas confertus Girard. Pecos R. drainage in Texas, etc. Lateral line com- 
plete, and male differently colored. 
Mylocheilus caurinus Richardson. Flathead Lake. A species of the northwest 
Pacific region, just reaching Montana. Devours eggs of salmon. 
Semotilus atromaculatus Mitchill. Colo., Wyo. 
Ptychocheilus oregonensis Richardson. Missoula, Mont. Species of Pacific slope. 
Ptychocheilus lucius Girard. Delta, Colo. Species of Colorado Basin. The largest 
of American Cyprinide, reaching a weight of 80 lbs. Body slender, elongate, with long, 
slender depressed head. D9, Ag. 
t In alcohol. 
2 This fish was sent to Dr. Evermann, who kindly reports that it is very close to zonatus, and probably 
that species, although it differs slightly in some of its characters. N. zonatus is a species of mountain streams 
in the Ozark region of Missouri and Arkansas, and the discovery of a very closely allied or identical fish in 
Colorado is of much interest. Typical zonatus is said to have scales 6-42-4. Dr. Evermann has added 
several characters to the diagnosis of our fish. He finds: head 4; eye about 34; teeth 2, 4-4, 2; scales 8—- 
43-4, 24 before the dorsal.) In my count, I made out fewer scales in the lateral line, but I counted only the 
pore-bearing ones. 
