(50) 



hind. Longest ray reaching 18th ray. Pectorals shorter than ventrals, 

 both shorter than head. Anal scarcely reaching caudal ; head very short, 

 high and thick ; its thickness | length, depth 1 1-5 in length. Mouth 

 quite small, oblique, and overlapped by a slightly projecting snout. Man- 

 dible short, 4 in head. Opercle becoming wrinkled with age. Head 

 small, short and thick ; muzzle obtuse, conic, not twice the length of eye. 

 Anterior ray of dorsal, in type from Illinois river, slightly nearer snout 

 than base of caudal. In specimens from St. Louis the dorsal is' about 

 equi-distant. Color above light steel blue in adults, becoming lighter be- 

 low. Young lighter with distinct stripes along the rows of scales. Al- 

 tliough the species is described from specimens but nine inches long, when 

 fully grown it undoubtedly reaches similar dimensions to its congeners. 

 Genus Buhalichthys, Ag. 



131. B. niger, (Raf.) Ay. Buifalo Fish. Rather common in the 

 large rivers throughout the state. 



Genus Cycleptus^ Raf. 



132. C. elongatus, (LeS.) Ag. Black-horse. Occurs in the large 

 rivers throughout the state. 



FAMILY SILURIDAE. 

 Genus Ictalurus, Raf. 



133. /. punctatus, (Raf.) Jord. Channel Cat. Occurs more or less 

 commonly throughout the state. 



134. I. furcatus, (LeS.) Gill. Great Fork-tailed Cat. Occurs in 

 the large rivers in the western and southern parts. 



Genus A'nimrus, Raf. 



135. A. confinisy (Grd.) Gill Several specimens are in the state 

 collection from the Illinois and tributaries, where it is rather common. 



136. .4. pullus, (DeK.') Gill. Black Bull-head. Several specimens 

 in the state collection from the Illinois and tributaries. Not uncommon. 



137. A. atranus, (DeK.) Gill. Northern Bull-head. Common in 

 Lake Michigain and rivers in the northern part of the state. 



138. A. albidns, (LeS.) Gill. Brown Cat Fish. Our commonest 

 species ; abundant throughout the state. 



139. A. vulgaris, (Thomp.) Nelson. (=:iA. dekayi, Gir. and A. 

 aelurus, Gir.) A few specimens have been taken in tributaries of the 

 Illinois in the central part of the state. 



140. A. cupreus, (Raf.) Gill. Yellow Cat. Common in the Illinois 

 and tributaries, and south. 



Genus HopladeluSf Raf. 



141. H. olivaris, (Raf.) Gill. Mud Cat. Not uncommon in the Ohio 

 and Mississippi rivers. 



Genus Noturus, Raf. 



142. N. flavus, Raf. Very common throughout the state. 



143. N. margmatus^Baird. Margined Cat. Common in the Wabash 

 valley and south. (Jordan.) 



