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22 BULLETIN OF THE UNITED STATES FISH COMMISSION. <br />Squali.usBouapart:e, (probably including Telec'c.sBonal?ar-te=Tigoatra., Cheonda, Siboma, <br />and Clinostomus Girard and Protoporus Cope). <br />2. Rutilus Rafinesque (=Leiaci,,wu.s Heckel. Gilrnber- Lerieo& Beckel=P"igus Bona- <br />parte; possibly should inclade 31gloleucas Cope) spncie,.s with the teeth 4-5 instead <br />of 5-6 or 5-5, as in Rutilus.) <br />3. Alburnu.s R,afiiiesgne= Alburnus Heckel. <br />4. Pharinus Ratine.sque.=Pho.rinus Aga siz. <br />For the present, at least, until better definitions can be given, we may refer the <br />American species to the genes Leuciseus in which they form a subordinate group (Ti- <br />goma or Telestes) distinguished by the smaller number of teeth and the generally smaller <br />scales. <br />3. Rhinichthys dulcis (Girard), A., D., C. (Xhinichthys 17-an.sniontmiue Cope.) <br />Very common. We are unable to distinguish our specimens from the Rio Grande, <br />from those taken by us in the Arkansas, Platte, and Yellowstone. As the tapes of <br />Rhinichthys transmonfauus are from New Mexico, we regard the latter species as a syno- <br />nym of R. dulci.s. Rlrini-chthys maxillosus Cope, originally described from Kansas, is the <br />same as R. dulcis. <br />- 4. Salmo mykiss Walbanm, D., C. (Var. spilurus Cope.) <br />Abundant in the upper Rio Grande, and in all tributary streams down to the level <br />of the valley-. Y <br />The Rio Grande trout have the dark spots rather large and more or less confinec> <br />-to the dorsal and caudal fins and the region between them,, though often," especially i <br />- ` the young, extending on the head. They reach a fair size, a pound or two in weightT <br />but are doubtless not. as large as the trout of the Upper Colorado. The Rio Grand <br />troat was first described as a distinct species by Professor. Cope under the name o <br />Salmo spiluru& The types of this nominal species came from-the Sangre de Cristo. <br />D.--COLORADO BASIN. <br />The Colorado River is formed by the union of two large rivers, Green River an <br />Grand River. Both of these-have their source in the Mountain. streams of the west* <br />ern slope of the Rockies, and`-are very clear and cold in their upper courses. Lowe.. <br />down they become gradually. turbid and yellow and finally the Colorado becomes on' <br />of our muddiest streams. The headwaters everywhere are fall of trout, and all th <br />tributary lakes, many of which exist in northwestern Colorado, are especially wel <br />stocked. The fish fauna of this great river is verv scanty. In the highlands the trop <br />_ is accompanied by Agosza .bins.- bower down the "Blob", am; still lower-y <br />-- --- -- <br />suckers, four species in all in the upper waters, and with then) the Round-tail (Gi <br />robusta) and the "White salmon" (Ptychaeheilus). This is the largest and bestfood, <br />fish of the Lower Colorado and the largest of the carp family in America. The BOnV <br />tail (Gila elegans) is found still lower down, while in Arizona the fauna is further in. <br />creased by the addition of three orfour more sackers and of species of Leucisc=, Meda <br />and other veers of chubs.and minnows... Collections were m <br />- - g made -by us at the follo.?r <br />ng localities <br />1. Grand River, at Glenwood Springs. Colo. -.The Grand River rises in the midd) <br />.11 t3rthern Colorado fiowing-southvVestward through deep -6rges.=. Glenw _Sprin <br />-lies at the foot of its deepest canon. The water is here yella_W and muddy, but th <br />< _. <br />- --------- - -- <br />. <br />vy Tr.. ?r.?