16G CONTEIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY — IV. 



spot 5 a dark spot near the base of the dorsal in front, as in Hyhorhyn- 

 clius. Head 4J; depth 5. D. 8; A. 7; scales 7-44-4; teeth 4-4, little 

 hooked. L. 3 inches.^ Michigan to Indiana. . 



(Rijhopsis iudltanus Cope, Trans. Amer. Phil. Soc. Pliila. 1863, 381: Leuciscus tuditanus 

 Giintlier, vii, 259.) 



203. C taasrocepSaaBa (Haj^) J. & G. — Bull-head .Minnow. 



Body stout, somewhat compressed, broad and flat above, with deep 

 caudal pednncle. Head broad and flat above, with an angle at the 

 temporal region. Muzzle broad and obtuse, less truncate than in Hy- 

 horhynchus notatus. Mouth rather small, horizontal, terminal, the jaws 

 about equal, maxillary not reaching to opposite anterior margin of eye. 

 Eye large, 3J in head. Dorsal inserted above ventrals, nearer snout 

 than caudal. Scales before dorsal small, in about til series. Dusky 

 yellowish; sides silvery, with an obsolete dark lateral band, which ter- 

 minates in a black spot ; a black spot on anterior rays of dorsal fli\. 

 Depth 4J ; head 4i. D. 8; A. 7; scales 8-43-4; teeth 4-4, with grind- 

 ing surface. L. 3 inches. Chickasawha Eiver, Mississippi. 



{AlJjurnops tauroceplialns Hay, Proc. U. S. Nat. Mus. 1880, 503.) 



204. C laajBiBatEtra (Cope) J. & G. 



Head moderate, the muzzle little obkise. Mouth larger, terminal, 

 oblique, the maxillary reaching the orbit. Eye 3 J in head ; temporal 

 region rounded. Scales rather small, 21 rows in front of the dorsal. 

 Lateral line slightlj^ decurved. Plumbeous above; head blackish; a 

 faint dusky lateral band, ending in a dusky spot at root of caudal fin; 

 caudal fin dull red; fins otherwise plain. Head 4; depth 4f. D. 8; 

 A. 7; scales 7-44-4; teeth 4-4, little hooked. L. 3 inches. Michigan 

 to Illinois; not very common. 



(Ryhoiysis hwmaturus Cops, Cypr. Peuu. 382, 1836: Leuciscus liwmaturus Giiutlicr, vii, 

 259.) 



aa. Scales iu the hiteral Hue 32-37. 



205. C spectrEBBBcaSa (Cope) J. & G. 



Body elongate. Head large and rather flat, nearly as broad as deep 

 Eye large, 3 in head. Muzzle remarkably thick. Mouth slightly ob- 

 lique, the maxillary reaching the eye. Fifteen rows of scales in front of 

 dorsal. Olivaceous, silvery white below ; a leaden band along the sides 

 and a conspicuous black spot at base of caudal ; head dusky ; margins 

 of scales above lateral line, as well as bases of dorsal and anal fins, 

 blackish ; i. ectorals, ventrals, dorsal, and anal more or less orange iu 



