(37) 
great abundance throughout the state, as far as I can learn. The young 
are found in myriads in the ditches draining the marshes along the Calumet 
river. 
23. M. salmoides, {Lac..') Gill. Small-mouthed Black Bass. Like the 
preceding, found in all parts of the state, and in nearly equal numbers. 
Genus Centrarchus , Guv. 
24. C. irideus , (Bose.) G. & V. Shining Bass. A single specimen, 
about three inches in length, is in the collection from a small stream flowing 
into the Mississippi, near Fountain Bluff, Southern Illinois. 
Genus Pomoxys , Raf. 
25. P. hexacanthus , (G. & F.) Ag. Calico Bass. Very abundant in 
the streams and small lakes in Northern Illinois, where it almost, if not 
entirely, replaces the following. Much less numerous farther south. 
26. P. annularis , Raf. Croppie. Very abundant in all the streams 
through Central and Southern Illinois. 
Genus Ambloplites , Raf. 
27. A. rupestris , {Raf.') Gill. Rock Bass. Very abundant every- 
where collections have been made. 
Genus Ghaenobryttus , Gill. (= Glossopolites, Jord.) 
28. C. gidosus, (C. & V.) Cope. (-=G. melanops, (Gir.) Jord.) Black 
Sun Fish. Prof. Forbes has found this species very common in the Illinois 
and tributaries^through Central Illinois. Specimens have also been taken 
in Lake Michigan by Prof. Jordan. 
Genus lelipomis , Raf. (= Ghaenobryttus, Grd.) 
29. T. cyanellus , Raf. Blue Sun Fish. Very abundant throughout the 
state in both large and small streams. 
30. T. microps , ( Grd.) Nelson. Common in the Calumet river in north- 
eastern, and tributaries of the Illinois in central and western parts of 
the state. 
31. T. nephelus , {Cope) Nelson. Occurs rather uncommonly in the Wa- 
bash valley; very hardy and voracious. (Jordan.) 
Genus Ichthelis , Raf. 
32. I. incisor, (G. & V.) Holbr. Blue Sun Fish. Abundant in all 
waters throughout the state. 
33. 1. speciosus, (Grd t ) Jord. Rather common in the western part of 
the state in tributaries of the Illinois and Mississippi. Also a few speci- 
mens are in the collection of the author from the Calumet river. Although 
this species approaches closely to incisor, yet certain tangible distinctions, 
sufficient to distinguish the two at sight, are always present as far as my 
observations have extended. 
34. I. aquiliensis, ( Grd.) Nelson. A fine adult specimen is in the state 
collection from the Illinois, and a second less mature from the Fox river at 
Geneva is in my collection. 
