242 Field Museum of Natural History — Zoology, Vol. VII. 



Ameiurus lacustris (Walbaum). Great Lake Catfish. 



Head 3.8; depth 4.5; D. 1-6; A. 24. Body robust; head broad, 

 depressed, its width 1,2 in its length; interorbital space flat, 1.8 in 

 head; diameter of eye 8.3 in head; upper jaw the longer; dorsal fin 

 to snout 2.7 in body, its spine short, bluntly pointed, its posterior edge 

 entire; pectoral spine weakly serrate behind; caudal fin moderately 

 forked. 



Color dark slaty to bluish black above, paler below; body without 

 dusky spots ; anal dusky edged. 



It reaches a weight of 40 pounds. 



This species inhabits the Great Lake Region. 



This fish is frequently taken in Deep River at Liverpool, Indiana 

 and is occasionally taken on set lines and in pound nets at Millers 

 and Pine, Indiana; individuals are sometimes caught in the park 

 lagoons within the city when taking the carp from these waters. 



Ameiurus natalis (Le Sueur). Yellow Bullhead. 



Head 3.1 to 3.5; depth 3.5 to 3.9; D. 1-6; A. 24 to 27. Body 

 very robust; head large, broad, somewhat depressed; its greatest 

 width about equal to its length; eye small, its diameter 7.2 to 8.5 in 

 head; upper jaw slightly longer than the lower; maxillary barbels 

 reaching about to posterior edge of opercles; dorsal fin small, low; 

 caudal fin rounded posteriorly. 



Color yellow, brown, green, or black above; yellowish to pale below. 



Length 12 to 18 inches. 



This species ranges from Dakota to New York, Florida, and Texas. 



Lagoon, Pine, Indiana; Lagoon, Clark Junction, Indiana. 



Ameiurus nebulosus (Le Sueur). Common Bullhead; Speckled 



Bullhead; Horned Pout. 



Head 3.2 to 3.6; depth 3.5 to 4.3; D. 1-6; A. 21 to 24. 



Body elongate to moderately robust; head subconic, rather nar- 

 row, its greatest' width 1.2 to 1.3 in its length; upper jaw slightly 

 longer than the lower; maxillary barbel reaching beyond gill opening, 

 often beyond humeral process; pectoral spine 1.8 to 2.4 in head, the 

 posterior edge with 6 to 10 (young) to 10 to 25 (adults) well developed 

 retrorse teeth, shorter when more numerous; base of anal fin 3.2 to 

 4.1 in body; free margin of fin but little rounded from 8th to 15th 

 ray; caudal fin slightly emarginate. 



Color dark yellowish to much marbled or mottled with darker to 

 nearly black; anal fin with membrane and rays of nearly the same 

 color. 



