63 



26. A iiimocrypta pellucida, Ba,\rd. — Sand Darter. 



(Bui, II, 38; Pleurolepis j)ellucidus.) 



The ranee ©f this little darter is limited strictly by the character of the 

 streams which it prefers, as it seems to occur only in somewhat swiftly run- 

 ning waters with sandy bottom. We have taken it in the Little Wabash and 

 the Embarras, and some other creeks of the Wabash Valley, but not else- 

 where in the State. 



Sub-family Centrachin^. (The Sun-fishes.) 



Genus 15. Micropterus, Lacep^de. 



Black Bass. 



27. Micropterus dolomiei, Lac. — Small-mouthed Black Bass. 



(Bui. II, 44; Micropterus salmoides.) 



Abundant in rivers and larger creeks, but occurring more rarely in lakes, 

 preferring swifter waters than the preceding species. It occurs throughout 

 Illinois, but is relatively rare to the southward. Has been taken by us in the 

 Wabash and some of its larger tributaries, but not elsewhere south of the Illi- 

 nois river. 



28. Micropterus salmoides, Lac— Large-mouthed Black Bass; Oswego 



Bass; Green Bass; Bayou Bass. 



(Bui. II, 44; Micropterus pullidus.) 



The large mouthed black bass favors especially lakes, ponds and sluggish 

 waters, but occurs also in rivers and large creeks throughout Illinois. It is 

 the common southern form of black bass, although perhaps, on the whole, no 

 more abundant there than in the northern part of the State. 



Genus 16. Lepomis, Raf. 



29. Lepomis gibbosus, L.— Common Sun-fish; Bream; Pumpkin-seed; 



Sunny. I 



(Bui. II, 46; Eupomotis aureus.) 



By far the'most abundant sun- fish in Northern Illinois, where it literally 

 swarms in every^lake and pond. It occurs, however, throughout the State, 

 but somewhat rarely southward, its place there being taken by Chcenohryttus 

 gulosus. 



30. Lepomis notatus, Agassiz. 



(Bui. II, 46; Eupomotis palUdus.) 



A rather rare species, occurring from the Illinois river southward, chiefly 

 in ponds and larger streams. 



31. Lepomis pullidus, Mitch.— Blue Sun-fish; Copper-nosed Bream; Dol- 



lardee; River Sun-fish. 



(Bui. II, 45; Lepiopomus pallidus.) 



Probably the most abundant of the sun-fishes; its preeminence, however, 

 in this respect being disputed by Lepomis cyanellus and gibbosus. Its distri- 

 bution and its haunts are more varied than those of either of these species, 

 as it is almost equally abundant in all parts of the State, and occurs in all 

 waters — in lakes, ponds, rivers, and smaller streams, from Lake Michigan 

 and the Illinois to small creeks and ponds. It is, on the whole, most abund- 

 ant in the larger rivers, being, in fact, the common sun-fish of the Illinois. 

 Collected by us from Lake to Union county, and in the Wabash valley. 



