(50) 
hind. Longest ray reaching 18th ray. Pectorals shorter than ventrals, 
both shorter than head. Anal scarcely reaching candal ; head very short, 
high and thick ; its thickness f 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- 
though the species is described from specimens but nine inches long, when 
fully grown it undoubtedly reaches similar dimensions to its congeners. 
Genus Bubalichthys , Ag. 
131. B. niger , (Raf.) Ay. Buffalo Fish. Bather common in the 
large rivers throughout the state. 
Genus Gycleptus , Raf. 
132. C. elongatus , (LeS.) Ag. Black-horse. Occurs in the large 
rivers throughout the state. 
FAMILY SILURIDAE. 
Genus Ictalurus , Raf. 
133. I. punctatus , (if af.) 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 Amiurus, Raf. 
135. A. confinis , ( Grd .) Gill. Several specimens are in the state 
collection from the Illinois and tributaries, where it is rather common. 
136. A. pullus, (BeK.) Gill. Black Bull-head. Several specimens 
in the state collection from the Illinois and tributaries. Not uncommon. 
137. A. atrarius, (BeK.) Gill. Northern Bull-head. Common in 
Lake Michigan and rivers in the northern part of the state. 
138. A. albidus , (LeS.) Gill. Brown Cat Fish. Our commonest 
species ; abundant throughout the state. 
139. A. vulgaris , (Thomp.) Nelson. (z=zA. 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 Hopladelus , Raf. 
141. H. olivaris, (Raf.) Gill. Mud Cat. Not uncommon in the Ohio 
and Mississippi rivers. 
Genus Noturus , Raf. 
142. NC jlavus , Raf. Very common throughout the state. 
143. N. mar ginatus, Baird. Margined Cat. Common in the Wabash 
valley and south. (Jordan.) 
