67 



Family XIII. CYPRINODONTIDtE. (The Toothed Minnows.) 



Genus 28. Gambusia, Poey. 



-53. Gambusia patruelin, B. & G, 



(Bui. II, 52; Zygonectes melanops; Synop., 340 and 892; Zygonectes melan- 

 ups, Zygonectes inurus.) 



A southern species, not collected by us north of White county. Abundant 

 in ponds and streams in the hill region of Southern Illinois. 



A comparison of Illinois specimens of '''melanops'''' with Gambusia patruelis 

 from North Carolina, leaves no doubt of both generic and specific identity. 

 Our Illinois examples were many of them with living young. 



Genus 29. Zygonectes, Agassiz. 

 Top Minnows. 



54. Zygonectes dispar, Agassiz. 



Throughout the State in small lakes, ponds, and creeks, and occurring 

 rarely in the main stream of the Illinois river. Chiefly a pond species. 



55. Zygonectes notatus, Raf. — Top Minnow. 



Ranges throughout the State, but is far the most abundant southward. 

 Common in small creeks and stagnant pools. Apparently able to live in any 

 water. 



Genus 30. Fundulus, Lacepede. 



KiLLIFISHES. 



56. Fundulus diaphanus, Le Sueur. — Spring Minnow. 



Ab9unds in the small lakes and streams of extreme Northern Illinois. Not 

 seen in the central or southern parts of the State. It is somewhat abundant 

 along the weedy margins of the small lakes, and has been found but once or 

 twice by us in streams. 



Family XIV. AMBLYOPSID^. (The Blind Fishes.) 

 Genus 31. Chologaster, Agassiz. 



57. Chologaster papiliferus , Forbes. 



Confined to cave streams and limestone springs of Southern Illinois at their 

 immediate origin in the bluffs. It is unquestionably a subterranean species. 



Order V. ISOSPONDYLl. 



Family XV. PERCOPSID^. (The Trout Perches.) 

 Genus .32. Percopsis, Agassiz. 



58. Percopsis guttatus, Agassiz. — Trout Perch. 



A common fish of the Great Lakes. Not often taken from rivers, but ob- 

 tained by us a few times in the Illinois. Apparently frequents deep water. 



Family XVI. SALMONID^. (The Salmon). 

 Genus 33. -Salvelinus, Richardson, Trout. 



59. Salvelinus namaycush, Walb.— Mackinaw Trout; Great Lake Trout. 

 (Bui. II, 54; Christivomer namayciish.) 



Occurs only in Lake Michigan. 



