197i UNIVERSITY OF COLORADO STUDIES 
Rhinichthys cataracte dulcis Girard. Boulder Co., Colo., abundant in Boulder Creek; 
Las Vegas, N. M.; tributaries of Rio Grande; eastern Wyo. and Mont., also in the Great 
Basin. 
Agosia yarrowi Jordan and Evermann. Colorado R. Basin. Gunnison R. at Gun- 
nison. Genus scarcely different from Rhinichthys. D7, A 7. Scales small, about 16- 
78-13. Barbel small but distinct. Sides with two ill-defined dark lateral bands. 
Hybopsis (Erimystax) estivalis Girard. Rio Grande at San Ildefonso, N. M. 
Hybopsis (Erimystax) gelidus Girard. Wyo., Mont. 
Hybopsis (Erimystax) montanus Meek. Upper Missouri, Mont. 
Hybopsis storerianus Kirtland. Eastern Wyo. 
H. (Nocomis) kentuckiensis Raf. Colo., Wyo. 
The following table is from that of Jordan and Evermann: 
Species of large size, not silvery, the mouth larger, nearly terminal H. kentuckiensis. 
Species of moderate or small size except storerianus, the mouth inferior, horizontal; 
preorbital broad, silvery .. EP rh oe a a ae a 
1. Large up to ro inches; sides bight dilbety" AON au Su Laker 02s 0S: 
Small, lessthan 3 inches. . . ilar AE LNT bea ee 
2. Back and sides pale, not dusted me atk fee gt) die 20S IN ET aomcarn ese 
Backiand!sidesisprinkled withidark/dots 7). ti) "204s 5) Maes 
Zo luOwer lobe of catidal pale; snoutamoderate” 95/73) es) ee H. estivalis. 
Lower lobe of caudal black in life; snout very long . . Je SMES gelidus. 
Couesius squamilentus Cope. Henry Fork of Green R., Wyo: Species of Colorado 
Basin. Scales 17-66-14 D. 8, A. 7 
C. dissimilis Girard. Colo., Mont. 
Platygobio physignathus Cope. Pueblo, Colo., where it is said to be the most common 
fish. Barbel distinct; D 8, A 8; scales 6-48-5, 20 before dorsal. Olivaceous above, 
white below, a plumbeous lateral band; fins plain. Length 6 inches. 
P. gracilis Richardson. Milk R., Yellowstone R., etc. Length 12inches. No dark 
lateral band. 
Plagopterus argentissimus Cope. San Luis Valley, Colo.1 DII.7, Aro. Body 
entirely scaleless; color clear silvery, back dusky. Length 2} inches. 
The domesticated carp and goldfish have the dorsal fin elongate, and the dorsal 
and anal fins each preceded by a serrated spine. The carp (Cyprinus carpio L.) has four 
long barbels; the goldfish (Carassius auratus L.) has none. Both are of Old World origin. 
FamiLy Characinide 
“A very large family of some 55 genera and 300 species, inhabiting the fresh waters 
of South America and Africa, where they take the place of the Salmonide and Cyprinide 
of the Northern Hemisphere”? (Jordan and Evermann). Only one species occurs in the 
United States, namely Tetragonopterus argentatus (Baird and Girard), which I have 
obtained from North Spring River, Roswell, New Mexico. 
t JORDAN AND EVERMANN describe this fish as inhabiting the Colorado basin in western Colorado. In 
this case the assigned type locality, the San Luis valley, may be doubtful, as this is in the upper Rio Grande 
basin. The fish is related to Pacific slope genera, not to anything in the Rio Grande. According to GILBERT 
it occurs at Fort Yuma. 
