11 



Cottus cognatus Richardson — slimy sculpin. Known 

 only from deep water of Lake Michigan off shore from 

 Chicago.. 



Cottus ricei (Nelson) — spoonhead sculpin. Sporadic 

 in deep water of Lake Michigan. 



Myixocepbalus cjuadricornis (Linnaeus)- — fourhorn 

 sculpin. Known only from deep water of Lake Michigan 

 off shore from Chicago. 



PROBLEMATICAL LIST 



The 35 species in the following list of hypothetical 

 additions to the Illinois fauna represent 18 genera and 

 1 1 families. 



Petromyzonidae — lampreys 



Ichthyomyzon bdellium (Jordan) — Ohio lamprey. Ap- 

 parently extirpated; formerly in the Wabash and Ohio 

 drainage systems, but not collected in the state since 1917. 



Clupeidae — herrings 

 Alosa sapidisiimu (Wilson) — American shad. Extir- 

 pated; attempts to introduce the species in the northern 

 part of the state in the late 19th century unsuccessful. 



Salmonidae — trouts and whitefishes 



Cnregonus alpenae (Koelz) — longjaw cisco. Not re- 

 corded from Illinois waters, but presumably occurring for- 

 merly in deep water of southwestern Lake Michigan. 



Coregonus dupeaformis ( Mitchill ) — lake whitefish. 

 Presumably still occurring in deep water of southwestern 

 Lake Michigan. 



Coregonus hoyi (Gillj — bloater. Presumably occurring 

 in deep water of southwestern Lake Michigan. 



Coregonus johannae ( Wagner ) — deepwater cisco. Not 

 recorded from Illinois waters, but presumably occurring 

 formerly in deep water of southwes'ern Lake Michigan. 



Coregonus kiyi (Koelz) — kiyi. Not recorded from 

 Illinois waters, but presumably occurring in deep water 

 of southwestern Lake Michigan. 



Coregonus nigripinnis (Gill) — blackfin cisco. Not re- 

 corded from Illinois waters, but presumably occurring for- 

 merly in deep water of southwestern Lake Michigan. 



Coregonus reighardi (Koelz) — shortnose cisco. Not 

 recorded from Illinois waters, but presumably occurring 

 in deep water of southwestern Lake Michigan. 



Coregonus zenithicus (Jordan & Evermann) — shortjaw 

 cisco. Not recorded from Illinois waters, but presumably 

 occurring in deep water of southwestern Lake Michigan. 



Prosopium cylindraceum cjuadrilaterale (Richardson) — 

 round whitefish. Presumably still occurring in deep water 

 of southwestern Lake Michigan. 



Sahelinus jontinalis (Mitchill) — brook trout. Extir- 

 pated; repeated attempts to introduce the species in the 

 northern part of the state unsuccessful. 



Esocidae — pikes 



Efox masquinongy Mitchill — muskellunge. Probably ex- 

 tirpated; formerly occurring in lakes of northeastern Illi- 



nois (Nelson 1876:43) and may still occur in southwestern 

 Lake Michigan. 



Esox niger Lesueur — chain pickerel. Recently intro- 

 duced in northern and central parts of the state by Illinois 

 Natural Histor)' Survey personnel; status of plantings as 

 yet unknown. 



Cyprinidae — minnows and carps 



Chrosomus eo^Copt — northern redbelly dace. Recently 

 introduced in the northeastern part of the state by South 

 Cook County Mosquito Abatement District personnel; 

 status of plantings as yet unknown; possibly occurring nat- 

 urally in Lake and McHenry counties, in view of its re- 

 ported occurrence in adjacent Kenosha County, Wisconsin 

 (Greene 1935:123). 



Gila elongata ( Kirtland ) — redside dace. Credited by 

 Forbes ( 1884:74), on authority of David Starr Jordan, to 

 the Rock River, but records not accepted by subsequent 

 authors; possibly occurring in Stephenson and Winnebago 

 counties, in view of its known occurrence in adjacent Green 

 County, Wisconsin ( INHS ) . 



Notropis arto77imus (Cope) — popeye shiner. Expected 

 in Illinois by Jordan (1878:60), but no records yet avail- 

 able; possible in extreme eastern and western parts of the 

 state, in view of its reported occurrence in nearby Parke 

 County. Indiana ( Eigenmann & Beeson 1894:89), and its 

 known occurrence in adjacent Perry County. Missouri 

 (INHS). 



Notropis photogenis (Cope) — silver shiner. Said to 

 occur, but without documentation, in bottomland lakes near 

 Brookport, Massac County ( O'Donnell 1935:482). 



Notropis zonatus ( Agassiz ) — bleeding shiner. Not 

 recorded from Illinois waters, but possible in the south- 

 western part of the state, in view of its known occurrence 

 in adjacent St. Louis, Jefferson, Ste. Genevieve, and Perry 

 counties, Missouri ( INHS ) . 



Semotilus niargarita nacbtriebi ( Cox ) — northern pearl 

 dace. Not recorded from Illinois waters, but possible in 

 Stephenson and Winnebago counties, in view of its re- 

 ported occurrence in adjacent Rock County, Wisconsin 

 (Greene 1935:84). 



Catostomidae — suckers 



Catostomus catostomus catostomus (Forster) — eastern 

 longnose sucker. Recorded from Rock River, Ogle County, 

 as C. hudsonius by Nelson (1876:48) and from Lake 

 Michigan as C. longirostrum by Jordan (18^8:64), but 

 records not accepted by subsequent authors; presumably oc- 

 curring in Lake Michigan off Lake and Cook counties, in 

 view of its reported occurrence in the Indiana waters of 

 Lake Michigan (Gerking 1945:40). 



Cyprinodontidae — topminnows 



r-undulus cdtenatus (Storer) — northern studfish. Not 

 recorded from Illinois waters, but possible in the south- 

 western part of the state, in view of its known occurrence 

 in adjacent St. Louis. Ste. Genevieve. Perry, and Cajse Girar- 

 deau ct)unties, Missouri ( iNHS ). 



