-TRmr - TO \<>KTII AMr.KK'AX ICHTHYOLOGY - IV. 



iinl equal to those above it. I>. S; A. 7; scales 13-70-13. Tributaries 

 of the Kio Crande in Colorado ami Xew Mexico. (Cope.) 



'.iHi.-htliit* HKirilt.x.'ii <"]>. A- YaiT..\v, /or,!. Whr.-lrr's Expl. W. lOOfh M.T. v, r>14, 

 : ini.t ..f Cope, 1-iil); Cope, Amrr. N.-u. .Inly. 1>7'., 441.) 



3I<*. R. Obllisiis Ana>si/. I!r<)W-ni>-(il I>>: 



Very similar to R. atronunu>i, but usually rather stouter, the barbel 

 more distinct, the head a little shorter, ami the coloration somewhat 

 di Herein. Hack olivaceous, mottled with darker; sides with a rather 

 taint brownish band, margined above and below with paler; belly sil- 

 very; a dusky blotch in the middle of the luse of the dorsal fin; males 

 with the pectoral tins enlarg d, and \vith the lateral band rosy. Dead 

 4; depth 4. D. 7; A. 0; scales 4-G3-8; teeth 2, 4-4, 2. L. 3 indies. 

 Wisconsin to Georgia; abundant in clear brooks. Probably a variety 

 of the next species. 



(Aga>six,, AMUT. .lourn. Sci. Arts, 1854, 357; Giinlhcr, vii, 190; Jordan, Ami. Lye. 

 V:it. Hist. N. Y. 1876, :::;!: mihiwhthu* liinatus Cope, Proc. Acad. Nat. Sci. Phila. 1864, 

 ftltini* ]i/lt>/ meleagris Aga&siz, AIIHT. Journ. 8ci. Arts, lb.")4, 15.">7 : lUtinichthysmeleagria 

 \i !-nn. Hull. Ills. Mus. Xat. Hist, i, 4(">: Uliitticlttlti/x mclcar/rin Giinther, vii, 190.) 



317. R. atroiiasiis (Mitch.) Ag. Illaclc-noaed Dace. 



r<dy moderately elongate, little compressed. Head moderate, rather 

 broad and llattish above. Snout motlerate. Mouth small, horizontal, 

 snbterniinal, the lower jaw included, barbel minute but probably always 

 present, upper lip on the level of the lower part of the pupil, max- 

 illary not reach in <; nearly to the eye. Eye small, nearly median, l.l in 

 snout, -\.\ in head. Fins rather small; dorsal tin well back. Scales 

 quite small, somewhat imbedded. Lateral line somewhat decurved. 

 Color blackish above; some of the scales irregularly darker ; a black 

 band passing jVoin snout through eye and along the sides of the 

 body; a pale streak below this; belly silvery ; males in spring with the 

 lateral band and the lower fins, and sometimes the whole body, bright 

 crimson ; males in late summer with ihe lateral band scarlet or orange, 

 the red COloi growing fainter later in the season. Head t; depth 4i. 

 D. 7 ; A. 7 ; Lat. I. (11 ; leeth L'. 1-1, i>. L. :! inches. New England to 

 Ohio and Virginia ; very abundant in clear brooks and mountain streams. 



(''.'// ,,1111.111.1 Mitrli. Trans. Lit. &, J'liil. 8oo. i. !''>": Ciinfhcr, vii, 191.) 



0.-AJOSIA (iininl. 



'Ginml. I'rnc. Arad. Nat. s. i. 1'iuia. L856, i -v, : i\pc dgotta chrysogtuter GrCL.) 



Body moderately elongate. Mouth moderate, normal, the premax- 

 Ulariea protractile, the maxillaries with a terminal barbel. Teeth 4-4, 



