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EXPLORATIONS Iv COLORADO AND UTAH. )t? ffamffkout are very abundant in all the headwaters of the Colorado and its tributaries rever the waters are clear and cold. These trout have for the most part the dark ots large and chiefly confined to the posterior part of the body. One specimen frorn , rapper's Lake is coarsely and closely spotted from head to tail. Others from Eagle Liver at Gypsum are finely spotted on tail only, r donaldi, from which they differ mainly in the shorter operclecand1ther less elongate body. As a whole, the trout from the Colorado approach most nearly to those from the Itio Grande, but in the specimens counted by me the scales are a little longer in the Rio 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 snore numerous on the tail ; others are closely- spotted even to tip of snout. Some with the head spotted, others not. Slots extending lose on the sides, usually some on the anal; dorsal and caudal profusely spotted in all. The trout from Canon Creek seem to be the yonng of these; smaller, paler, the '[sots more ennfine(l to the tail. Red markings rather orange than crimson. All ;how traces of a red lateral band and have the lower fins red. All have much red ruder the throat and on brancbivstegals and operele. Some of them show round )range blotches on lateral line anteriorly. . Trout from Sweetwater Lake are like those from Trapper's Lake, but with the pots encroagbing more on the belly. Trout from Eagle River show more resemblance to the yellow. fln of Twin Lakes t the small size of the spots and the plain coloration. Their place seems, however, be in var. pleuriticus with the others from the Colorado Basin. I Cottus band{ punctulatus (Gill), Bulllwad. Our specimens correspond with Ur•trrtidea ptrnetulata. Gill, from the head of Green Iver, except that the dark shut: on the burly are very irreptl arly developed and oftefi :u)ting• They differ front ntv;t Eastern examples in the tbri r of the head, which is miter, lower, and more ronnded, and without a distinet niedial depression. The. black ars usually found in Eastern examples is wantifig in these, anti in these there are no 'ickles on the skin behind the aril, nor anywhere' else. The specimens found in the !adwaters of the Missouri in Yellowstone Park seem to be fully- identical with ours )m the basin of the Colorado. Cottrtsprtncttclatits u)ity- prove to be a species distinct front C. hairdi (=C. richard- ci,etc.), but some spet;innens exafitinetl by its (Torch Lake, _Michib;afi) scent to he, ermediate. Var. prtrtchdatits is thtt> far known from the Lipper ?lisvuri and the )per Colorado. Specimens were obtained by its in G;agle River, Roaring Fork, tutison River, at Delta, l;iu Florida, Leitner'.n Creek and Itio de las Anin?as Per- -Is. In the Eale and l'lorida it is excessively abundant, as in the streams of the Ilowstone Park." liTAll To the east of the 1-fall , scarcely ?j'ah,atch liuuntairts, t:ah is chiclly an arid desert, with little any ye;;eGatiuu1 M,d fill pernlarrent stre:uns of all y i itself The svl?u n?purt:afire except Colorado . 1e surface is M;tile up of adobe hills and barren mesas, r ;E j.