( 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. elides. Jord., Mss. Barred Darter. Rare Occurs in the 

 lower Wabash and Ohio valleys. {Jordan.) 



Genus Percina^ Hold. 



15. P. caprodes (Ra/.), Grd. Log Perch. A few specimens from the 

 Calumet and Vermilion rivers. Becomes quite numerous in the Wabash 

 valley. 



Genus Perca^ Linn. 



16. P. Jiavescens, (Mit.) Cuv. 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 

 difi"erent 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. amtricunum, {Val.) Gilt. Pike Perch. Very common in Lake 

 Michigan and the larger streams throughout the state. 



18. aS'. griseum, (DeK.) Mihier. Gray Pike Perch. Very abundant in 

 the larger streams. Whether it occurs m Lake Michigan or not I am un- 

 certain. 



19. aS'. salmoneum, (^Ra/.). Salmon Perch. Ohio river and large 

 tributaries. (Jordan.) 



Germs Roccus, Mitch. 



20. R. rhrt/sops, (Raf.) Gill. White Bass. Exceedingly abundant in 

 Lake Michigan. Common throughout the state. 



(/enus Moro7ie, Mitch. 



21. M. interrnipta. Gill. Short-striped Bass. A number of specimens 

 in the collection from Mackinaw creek and the Illinois river. 



Genus Micropterus, Lac. 



22. M. ni(fricans,(^Oav.) Gill. Large-mouthed Black Bass. Found in 



