6f5 



Argyi'osomuH hoyi Gill — Moon-eye Cisco. 



I^ake Michigan, in deep water. 

 Aniijmsonnix imjfjnathns (H. iVI. Smith). — Long^-jaw Bloater. 



Lake Michigan. 

 Argurosornus nigHpennin (nil. — 'Jlue-fin: IJlack-fin. 



Lake Michigan, in deep water. 

 Ann/rosnimts iiiUihee (Richardson). — Tullibee; ''Mongrel Whitefi.sh." 



Lake Michigan. 

 Crixfivomer iKniKijifush (Walbaum). — (Jreat Lake Trout; Mackinaw Trout. 



Lake Michigan. 



SalveUnuK fonfinalhi (Mitchill). — Brook Trout; Speckled Trout. 



Attempts have frequently been made to introduce this and other trout into the streams of 

 Illinois, but apparently entirely without success. Trout will not thrive where the tempera- 

 ture of the water at any time exceeds 60 degrees. 



Family Umbkid.e (Tiik MiD-.Mixxdws.) 



Umbra liinl (Kirtland). — Mud-minnow. 

 This little fish has a form very much like that of the common dogfish > Amia Caha). It 

 can, however, be at once distinguished from the latter by itssmall dorsal fin. which has but 

 14 rays, while the number is 42 to 53 in Amia. 



Usually taken from erassy ponds or muddy creeks, which it apparently prefers to large 

 open waters. Taken in 29 localities throughout the State. 



Family Ltciid.e (The Pikes). 



Lucius vermiculatus (Le Sueur). — The Little Pickerel. (214) 

 The little pickerel seldom exceeds 12 inches in length. It differs from our other species 

 (L.. lucius) in this respect, and in having tlie cheeks and opercles fully scaled. 



Found in grassy prairie creeks and along weedy margins of larger streams throughout the 

 State. 



Liicms luclus (Linnyeus). — Common Pike; Pickerel. (216) 



A voracious feeder, taking fishes of considerable size; the jaws provided with strong back- 

 ward-pointing teeth. Differs from the preceding in having the lower portion of the opercle 

 bare. 



No longer common, but found in all sections of the State. 



LuHui^ Masqulnotuiy (Mitchill). — Muskallunge. (217). 

 Differs from the preceding two species in having the lower portion of both cheeks and 

 opercle bare. 



Taken in Lake Michigan; has been said to occur in the lakes of northern Illinois (.Nelson.) 



Family P(eciliid.e (The Killifishe.s). 



FundulU'S diaphanus incnona (Jordan & Copeland). — Top-minnow. 

 Found in Illinois only in the lakes of the northeastern part and in Rock River. 



Fundiilux disp<tr (Ag-assiz). — Top-minnoAY. (208) 



The body marked with several narrow vertical bars of dark color. 



Found throughout the State in the tiuiet weedy pools of smaller streams, or along the 

 margins of larger streams. (Juite rare northwaro. 



FunduUix notatux (Rafinesque). — Top-minnow. (206) 

 On the side and around the snout a large dark purplish stripe, with sometimes a sugges- 

 tion of bars. 



Common throughout the State in such situations as described for F. disfxtr. 



Oitiuhusia (tffiuis (Baird ».<: (lirard). — Top-minnow. (211) 



A tiny top-minnow, with deep body. The males are very minute and scarce. 

 Takeii from seventeen localities in southern Illinois; two specimens from Havana pro- 

 visionally referred to this species. 



OnmhuKia nohilis (Baird & Girard). — Top-minnow. 



Similar to (;. affiiiis, but less common in our collections. Possibly identical with the pre- 

 ceding, specimens l)eing overgrown examples of that species. 



From Johnson county, and from ponds near the \\'abash river opposite Mt. Carmel. 



