SILTJEID^E. CX. 303 



equal; color dark; size small; otherwise like the pre- 

 ceding. Ohio to Ills, (needs confirmation.) [A. cupre- 

 oides, (Grd.) Gill.] 



12. A. ccenosus, (Rich.) Gill. LAKE HURON CAT FISH. 

 Dark greenish, paler below; spines strongly serrated; 

 D. I, 7; P. I, 8; A, 24. Lake Huron. A doubtful 

 species. 



3. HOPLADELUS, Rafinesque. MUD CATS. 



1. H. olivaris, (Raf.) Gill. MUD CAT FISH. Body 

 elongated, long and low; lower jaw longest; head de- 

 pressed, thick-skinned; caudal emarginate ; olive brown, 

 paler below; size very large; D. I-, 6; P. I, 30; A. 15 

 (or more?). Mississippi Valley. (Other species probably 

 exist, but they have never been studied.) 



4. NOTURUS, Rafinesque. STONE CATS. 



1. N. flavus, Raf. OHIO STONE CAT. Head 3 to 4 

 in length; dorsal longer than high; barbels rather short; 

 color nearly uniform yellowish brown; body thick and 

 short; D. I, 7; P. I, 7; A. 16. Ohio Valley; abundant 

 and very variable. 



2. N. /emn/scatuSf (LeS.) Gill. SOUTHERN STONE CAT. 

 Head broad, 4 in length; spines short; D. I, 7; P. 1, 10; 

 A. 21. Rivers S. & W. 



3. N. marg/natus, Baird. MARGINED STONE CAT. 

 Head 4 in length; dorsal higher than long; barbels rather 

 long; brownish or blackish, much mottled and barred; 

 fins black -edged; head smaller than in JV". flavus, and 

 the body more elongate; D. I, 7; A. 14; P. I, 7. Penn. 

 to S. C. and W. 



4. N. gyrinus, (Mit.) Raf. NORTHERN STONE CAT. 

 Head elongate, flat, 3^ in length; barbels, long; brown- 



