154 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY IV. 



minutely tubercnlate and the fins are bright yellow. ITead 4; depth 4. 

 I>. 7; A. s; scalo l<i-s.-)-K); teeth usually .">-.". L. 2-3 inches. Penn- 

 sylvania to l>akota and Tennessee; abundant in small streams; one of 



the most beautiful of our lishes. 

 (Liisilit* or Clirosoinitx iri/throf/astrr R;if. Ichtli. Ob. 1820,47: Lurilus crytlu-otiafitcr 



Kin. Host. Journ. N;n. Ih.st. iv, :23, tig. 1644; Cope, Cypr. IVim. ll'.U : IA UCHS try- 



tlinii/nxttr (Jiinther, vii, ~'4T ; Jordan, HlfJ.) 



** Sides of body with the upper band beginning opposite tbr \'nt and extending 

 backward to Ibe middle of tbe caudal, terminating in a black spot; lower 

 baud extending from snout through eye, downward and backward, censing 

 at base of anal ; back with dark spots aud cross-bars. 



17. C. oreas Cope. 



Form of the preceding, the snout rather more obtuse. Coloration 

 similar to that of the preceding, except for the difference in pattern. 

 The back clear olive-green, with dark cross-bars; belly, interspace be- 

 tween the lateral bands, and bases of vertical fins bright crimson; tins 

 otherwise yellow. Head 4; depth 4J. D. 8; A. 8; Lat. 1. 67; teeth 

 5-5. L. 2\ inches. Tennessee and Eoanoke Elvers; even more brill- 

 iant than the preceding. 



(Cope, Jouru. Acad. Nat. Sci. Phila. 1808,233.) 



*** Body with t\\o black lateral bands mi the side, which unite on the caudal pedun- 

 cle, the lower broader, decurved, the upper narrow and straight. 



179, C. cos Cope. 



Slenderer than the preceding; the lateral line less distinct, often en- 

 tirely wanting. Variations in color as in the other species. Uead 4; 

 depth"). D. 8; A. 8; Lat. 1. 77; teeth 5-5. L. 2i inches. Susquehanna 

 Kiver. Perhaps a variety of C. enj11iro<i*trr. 



(Cope, I'roc. A.-ad. Nat. Sci. IMiila. l^lil, .vj:i ; Cope, Cypr. Pcnn. :;'.!.) 



7G.ZOPBHE \DUITI Jordan. 



(.Ionian, I'.ull. llayden's (icol. S;nv. Terr. iv. 7H6, l-',^: type Ilyborhynchus sidcrius 

 Cope.) 



This genus is very closely related to Hybognathus, dilli'ring only in 

 the small si/e of the scales, there being ."."-()() in the course of the 

 lateral line. The physiognomy is somewhat different, and the dorsal 

 (in is inserted more posteriorly than usual in Ili/hinjii<(tliKn. Asin7f//&o- 

 ti>i(ithn*, the teeth are l-(, scarcely hooked, with narrow grinding surface, 

 and the intestinal canal is elongate, the peritoneum black. Kocky 

 Monntain region; one species in Western Mexico.* ("otfu-, darkness; 



';, within; in allusion to the black peritoneum.) 



" Scales very .small, -.".-'.Hi in the course of tin- lateral lino. 



'/. .(//s,'/-.//. Jordan. I'.ody r.ither elongate, formed much as in C<tni]><n<l<>inii iitioma- 

 I it at, soineuhai compic.sM-d. t1i<' bad; somewhat elevated and rounded anteriorly. 

 1 1. -ad nil her large, slightly depressed above. Mouth moderate, low; the lower jaw 



