EXPLORATIONS IN COLORADO AND UTAH. 
17 
8. Platygobio pliysigiiatlms (Cox)e). A., F. 
Very cominoii, the most abundant species in the river. Tliis species is a true Platy- 
gohio, not a Couesius. It differs from P. gracilis in having the head shorter, narrower, 
and blunter, less depressed above. Anterior profile forming a nearly even curve, 
which is everywhere convex. Head 4'^ in length, depth 4g, scales 6-48-5, 20 scales 
before dorsal, snout 3 in head ; teeth with distinct grinding surface. In P. gracilis 
the broad head is concave in profile above the eye. P. pallidus Forbes may be a valid 
species, but from the description I can not tell it from the young of either of the 
others. Our specimens from St. Joseph, Mo., seem to be P. gracilis. 
9. Hybognathus nuchalis Agassiz (var. placita). P. 
Not rare in the river. 
10. Hybopjais tetranemus Gilbert. P. 
One specimen of this singular little fish. Barbels long, the second pair nearly as 
long as the eye. Some of the specimens from the Arkansas basin, recorded by Jor- 
dan & Gilbert as Hyhopsis ccstivalis, belong to the species. 
11. Fundulus zebrinus Jordan & GiUiert. F.,C. 
Very common in brooks and the pond ; not seen in the river. 
12. Lepomis cyanellus (Rafiuesfpie). C. 
One found in the pond at Canon City. 
13. Etlieostoma cragini Gilbert. C. 
Very abundant in the pond at Caiion. Head naked ; fins with brick-red shades ; 
body with blue specks in life ; body and fins profusely punctulate with black. 
C.-— ARKANSAS RIVER AT WICUITA. 
1. Ameiurus melas (Ratluesque). 
2. Ictalurus punctatus (Rafinesque). 
3. Ictiobus bubalus (Rafinesque). 
4. Ictiobus difformis (Coiie). 
Numerous specimens; the dorsal rays low, little longer than head and stout at base. 
Eye 4^ in head. Snout short, very blunt. 
5. Moxostoma duquesnei (Le Sueur). 
Head 4§ in length in one example, and head 4^ in another. 
6. Campostoma anomalum (Ratluesque). 
7. Hybognathus nuchalis Agassiz. 
Numerous examples of the ordinary type. 
8. Pimephales pronielas confertus (Girard). 
Scarcely if at all different from the common jdrmnetos. 
9. Pimephales notatus (Rafinesque). 
10. Cliola vigilax Baird & Girard. 
11. Notropis scylla (Cope). 
Abundant. 
12. Notropis cayuga Meek. 
Abundant. This is a widely diffused species, allied to N. heterodon^ from which 
it is easilj^ known at sight by the absence of black on the chin. Head, 4|^ in length ; 
depth, 4J; scales, 36; 14 before dorsal; lateral line wanting on some scales; mouth 
Bull. U. S. F. C. 89 2 
