EXPLOEATIONS IN COLORADO AND UTAH, 
2 !) 
Trout are very abuiiclaiit iu all the headwaters of the Colorado aud its tributaries 
wherever the waters are clear aud cold. These trout have for the most part the dark 
spots large aud chiefly couflued to the posterior part of the body. Oue specimeu from 
Trapper’s Lake is coarsely aud closely spotted from head to tail. Others from Eagle 
Kiver at Gypsum are finely spotted ou tail only, repeating the coloration of var. mac 
donaldi, from which they differ mainly iu the shorter opercle aud the less elongate 
body. 
As a whole, the trout from the Colorado approach most nearly to those from the 
Eio Grande, but in the specimens counted by me the scales are a little longer iu the 
Eio Grande fish. 
Coloration in life of trout from Trapper’s Lake, olivaceous ; lower fins red, sides 
with a crimson-red band on level of pectoral, present in every one of eleven specimens. 
Flesh mostly salmon red. Black spots large, varying much in number, in some much 
more numerous ou the tail ; others are closely spotted even to tip of snout. Some with 
the head spotted, others not. Spots extending low on the sides, usually some on the 
anal ; dorsal and caudal profusely spotted iu all. 
The trout from Canon Creek seem to be the young of these; smaller, paler, the 
spots more confined to the tail. Eed markings rather orange than crimson. All 
show traces of a red lateral band and have the lower fins red. All have much red 
under the throat and on branchiostegals aud opercle. Some of them show round 
orange blotches on lateral line anteriorly. 
Trout from Sweetwater Lake are like those from Trapper’s Lake, but with the 
spots encroaching more on the belly. 
Trout from Eagle Elver show more resemblance to the yellow-fin of Twin Lakes 
in the small size of the spots aud the plain coloration. Their place seems, however, 
to be in var. pleuriticus with the others from the Colorado Basin. 
10. Cottus bairdi punctulatus (Gill). Bullhead. 
Our specimens correspond with Uranidea punctulata Gill, from the head of Green 
Eiver, except that the dark spots on the body are very irregularly developed aud often 
wanting. They ditfer from most Eastern examples iu the form of the head, which is 
blunter, lower, and more rounded, aud without a distinct medial depression. The black 
bars usually found in Eastern exami^les is Avantiug in these, and in these there are no 
prickles on the skin behind the axil, nor anywhere else. The specimens found in the 
headwaters of the Missouri iu Yellowstone Park seem to be fully identical with ours 
from the basin of the Colorado. 
Cottus punctulatus may jirove to be a species distinct from G. hairdi { = C. richard 
soni,etG.), but some specimens examined by us (Torch Lake, Michigan) seem to be 
intermediate. Yar. piincttdatus is thus far known from the Upper Missouri aud the 
Upper Colorado. Specimens were obtained by us in Eagle Eiver, Eoaring Fork, 
Gunnison Eiver, at Delta, Eio Florida, Leitner’s Creek and Eio de las Animas Per- 
didas. In the Eagle aud Florida it is excessively abundant, as in the streams of the 
Yellowstone Park. 
UTAH. 
To the east of theWahsatch Mountains, Utah is chiefly an arid desert, with little 
rain-fall, scarcely any vegetation, and iio permanent streams of any importance except 
the Colorado itself. The whole surface is made up of adobe hills aud barren mesas, 
