63 
Family IV. SERRANIDA). (Tue Sea Bass.) 
Genus 4. Roccts, Mitchill. 
Bass. 
Bes interruptus, Gill—YELLow Bass ; SrriveD Bass; Brassy 
ASS. 
' (Bul. Il, 44; Morone interrupta.) 
This species has not occurred in Northern Illinois to our knowl- 
dge, but has been collected by us almost wholly in the Illinois 
liver and in the bottom lakes connected with that stream. 
Roceus chrysops, Raf.—Wuire Bass ; Srnver Bass. 
Throughout Illinois, in creeks and rivers, and in Lake Michigan, 
nuch more rarely in the small northern lakes. It seems, indeed, 
o be wholly wanting in the lakes of the Fox River system, in which 
tis said by the older fishermen to have been exterminated by 
evere winters some years ago. ‘'he presence of impassable fish- 
lams in the Fox River, through which these lakes are drained, 
srobably accounts for its non-appearance since. 
Family V. PERCID. 
Sub-family Percinn. (Tue TRvE PERCHES.) 
Genus 5. Srizostepium, Raf. 
Pixe PERCHES. 
3. Stizostedium canadense, Smith.—SavucEr ; SAND-PIKE ; GRAY-PIKE. 
‘The distribution of this species in Illinois is precisely like that of 
the following. 
1 Strzostedium vitreum, Mitch.—WaALL-EYED Pike; Dory; GLASS-EYE ; 
Yreutow Pike; Buve Pine; ‘Jack SALMON.” 
Found only in the larger rivers and lakes; occurring in our col- 
lections from the Wabash, [llinois and Rock Rivers. Especially 
abundant in the former at the rapids above Mt. Carmel. 
Genus 6. Pzrca, Linneus. 
PERCH. 
8. Perca americana, Schranck.—YELLOW PERCH ; American PERCH; 
: RincGeD PERCH. 
A very abundant species in the northern part of the State; ex- 
Cessively common in Lake Michigan, where it is caught from the 
wharves by thousands daily. Also swarming in the small northern 
lakes, and one of the commonest fishes in the clearer creeks and 
Yivers. In Central Illinois it 1s somewhat rare, occasional speci- 
mens 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 vari- 
ous sunfishes. 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. 
