60 



Family IV. SERRANID^E. (The Sea Bass.) 



Genus 4. Roccus, Mitchell. 



Bass. 



4. Eoccus interruptus, Gill.— YELLO^^ Bass; Striped Bass; Brassy Bass. 



(Bui. II, 44; Morone interrupta.) 



This species has not occurred in Northern Illinois to our knowledge, but 

 has been collected by us almost wholly in the Illinois river and in the bottom 

 lakes connected with that stream. y 



5. Roccus chrysops, Raf.— White Bass; Silver Bass. 



Throughout Illinois, in creeks and rivers, and in Lake Michigan, much 

 more rarely in the small northern lakes. It seems, indeed, to be wholly 

 wanting in the lakes of the Fox river system, in which it is said by the old 

 fishermen to have been exterminated by severe winters some years ago. The 

 presence of impassable fishdams in the Fox river, through which these lakes 

 are drained, probably accounts for its non-appearance since. 



Family V. PERCID.E. 

 Sub-family Percin^. (The True Perches.) 

 Genus 5. Stizostedium, Raf.— Pike Perches. 



6. Stizostedium canadense, Smith. — Sauger; Sand-Pike; Gray-Pike. 



The distribution of this species in Illinois is precisely like that of the 

 following. 



7. Stizostedium vitreum, Mitch.— Wall-eyed Pike; Dory; Glass- eye; Yel- 



low Pike; Blue Pike; "Jack Salmon." 

 Found only in the larger rivers and lakes; occurring in our collections from 

 the Wabash, Illinois, and Rock rivers. Especially abundant in the former at 

 the rapids above Mt. Carmel. 



Genus 6. Perca, Linnaeus. 

 Perch. 



8. Perca americana, Schranck. — Yellow Perch; American Perch; Ringed 



Perch. 



A very abundant species in the northern part of the State; excessively 

 common in Lake Michigan, where it is caught from the wharves by thou- 

 sands daily. Also swarming in the small northern lakes, and one of the 

 commonest fishes in the clearer creeks and rivers. In Central Illinois it is 

 some what rare, occasional specimen only occurring in the Illinois. In the 

 southern part of the State we have not seen it at all, not a single specimen, 

 in fact, occurring in our collections south of the latitude of Alton. South- 

 ward its common name even is applied to other species — the various sun- 

 fishes. There is a uniform average difference in brightness of color between 

 the lake and river specimens, the latter being much the brighter, but there 

 are no specific distinctions. 



Sub-family Etheostomatin^. (The Darters.) 

 Genus 7.1: Microperca, Putnam. 



9. Microperca Punctulata, Putnam. — Least Darter. 



This little species, the smallest of our fishes, is much the commonest north- 

 ward, but has been taken as far south as Union county. It is less select in 

 its haunts than most of the other Darters, oecuringiu waters of every descrip- 

 tion; but we have found it commonest in lakes, and scarcelj' less abundant 

 along the weedy margins of larger rivers. 



