( 36 ) 
shape of the spots on the sides, by the much more slender form and very 
narrow, pointed, eel-like head, the depth of which is less than half its length, 
and its width two-fifths its length. 
14. E. evides. Jord., Mss. Barred Darter. Rare Occurs in the 
lower Wabash and Ohio valleys. ( Jordan .) 
Genus Percina , Hold. 
15. P. caprodes ( Raf ^), Grd. Log Perch. A few specimens from the 
Calumet and Vermilion rivers. Becomes quite numerous in the Wabash 
valley. 
Genus Perea , Linn. 
16 . P. flavescens, (Mit.) Guv. Common Perch. Very abundant in Lake 
Michigan and its tributaries ; also occurs, but in smaller numbers, in the 
Illinois and tributaries. Rare in the Ohio ( Jordan ). Specimens from the 
clear waters of Lake Michigan are usually a light color — almost white. 
Often the dark bars, generally so characteristic of the species, are so obso- 
lete that the fish appears to be a clear, yellowish white, with the faintest 
trace of dark mottling, and the lake perch are rarely as decidedly barred as 
specimens taken in streams. The river perch may be at once distinguished 
by the heavy dark bars, and the dark greenish yellow color on the sides. So 
different are the two that I have several times heard persons speak of them 
as distinct species. 
The aversion of the river form to the lake water and vice versa , I have 
often seen strikingly illustrated. The river bed of the Calumet is so slightly 
above the lake that during a hard north or northeast storm the lake water 
gradually forces back the water in the river, — often for a number of 
miles — and, as the cold lake water fills the channel, the river perch retreat, 
and their places are supplied by the lake form. As the storm subsides the 
current of the river forces the lake water back, driving before it the lake 
perch, and the river perch are again found in their usual haunts. 
Genus Stizostedium , Raf. 
17. S. americunum , (Val.) Gill. Pike Perch. Very common in Lake 
Michigan and the larger streams throughout the state. 
18. S. griseum , ( DeK .) Milner. Gray Pike Perch. Very abundant in 
the larger streams. Whether it occurs in Lake Michigan or not I am un- 
certain. 
19. S. salmoneum , (Raf.). Salmon Perch. Ohio river and large 
tributaries. (Jordan.) 
Genus Roccus , Mitch. 
20. R. chrysops , (Raf.) Gill. White Bass. Exceedingly abundant in 
Lake Michigan. Common throughout the state. 
Genus Morone , Mitch. 
21. M. interrupta , Gill. Short-striped Bass. A number of specimens 
in the collection from Mackinaw creek and the Illinois river. 
Genus Micropterus , Lac. 
22. M. nigricans, (Guv.) Gill. Large-mouthed Black Bass. Found in 
