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E%PLORATIO:NS IN COLORADO AND UTAH. 29 <br />are very abundant in all the headwaters of the Colorado and its tributaries <br />the waters are clear anti cold. These troat have for the most part the dark <br />' g and chiefly confined to the posterior part of the body. One specimen from <br />uke_is coarsely and closely. spotted from head to tail. Others from Eagle <br />" Uypsam are finely spotted on tail only, repeating the coloration of var. mac. <br />from which they differ mainly in the shorter opercle and the less elongate <br />k <br />whole, the trout from the Colorado approach most nearly to those from the <br />de, but in the specimens counted by me the scales are a little longer in the <br />Rttrande 6sh. <br />b?foration in life of trout from Trapper's Lake, olivaceons; lower fins Fed, sides <br />witj?erimson-red band on level ot'pectoral, present in everyone of eleven specimens. <br />1''I 7jitly salmon red. Black spots large, varying much in number, in some much <br />more "erous on the tail; others are closely spotted even to tip of snout. Some with ? <br />t6l? spotted, others not. Spots extending low on the sides, usually some on the <br />any orsaI and caudal profusely spotted in all. <br />at from Cafion Creek seem to be the young of these; smaller, paler, the _ <br />s confined to the tail. Red markings rather orange than crimson. All ry <br />ve_of a red lateral band and have the lower fins red. A11 have much red <br />a throat and on brancbiostegals and opercle. Some of them show round <br />es on lateral line anteriorly. <br />ttx Sweetwater Lake are like those from Trapper's Lake, but with the <br />Ing more on the belly. _ <br />ffrom Eagle River show more resemblance to the yellow-fin of Twin Lakes <br />in maRsize of the spots and the plain coloration. Their place seems, however, <br />-to Lie iar:. pleuriticua with the others from the Colorado Basin. j <br />r_ 1-10: ?s bfi di punctnlatus (Gill). Bullhead. <br />specimens correspond with t"iranidea punchdata Gill, from the bead of Green x <br />RiV0 eat`that the dark spots on the body are very irregularly developed and otter =- ' <br />wantltt$. ,They differ from most Eastern examples in the form of the bead, which is <br />bluoWrtlower, and more rounded, and without a distinct medial depression. The black r <br />bars usually found in Eastern examples is wanting in these, and in these there are no - } <br />prickles on the skin behind the aril, nor anywhere else. The specimens found in the <br />headwaters of the Missouri in Yellowstone Park seem to be fully identical with ours <br />from the basin of the Colorado. <br />CI)HUS punctulatus may prove to be a species distinct from C. bairdi (=C. rickard- <br />*'KS,etc:),but some specimens examined by us (Torch Lake, Michigan) seem to be, <br />intermediate. Var. punct)datu.s is thus far knowr. from the Upper Missouri and the ` <br />Upper Colorado. Specimens were obtained by us in Eagle River, Roaring Fork, v <br />Gunnison River, at Delta, Rio Florida, Leitner's Creek and Rio de las Animas Per- <br />?lydas. _- In the Eagle and Florida it is excessively abundant, as in the streams of the <br />= <br />Y8110 one Park. ' <br />UTAH. - <br />TIM-* east of the Wahs,atch Motintains, Utah is chiefly an arid desert, with little <br />rain- ; scarcely any vegetation, and nu permanent strearns of any importance except <br />the Colorado itself. The whole surface is made tip of adobe hills and barren mesas, <br />- - V <br />1 IN <br />r. x .. . -a.?. .