96 



A comparison of Illinois specimens of "melanops" with Gamhusia 

 patrueUs from North Carolina, leaves no doubt of both generic and 

 specific identity. Our ^Illinois examples were many of them with 

 living young. 



Genus 29. Zyggnectes, Agassiz. 

 Top Minnow !". 



54. Zyc/onectes dispar, Agassiz. 



Throughout the State in small lakes, ponds, and creeks, and oc- 

 curring rarely in the main stream of the Illinois Paver, Chiefly a 

 pond species. 



55. Zygonectes notatus, Raf. — Top Minnow. 



Ranges throughout the State, but is far the most abundant south- 

 ward. Common in small creeks and stagnant pools. Apparently 

 able to live in any water. 



Genus 30. Fundulus, Lacepede. 



KiLLIFISHES. 



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



Abounds in the small lakes and streams of extreme Northern Illi- 

 nois. 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.E. (The Blind Fishes.) 

 Genus 31. Chologasteb, Agassiz. 



57. Chologaster papiliferus, Forbes. 



Confined to cave streams and limestone springs of Southern Illi- 

 nois at their immediate origin in the bluffs. It is unquestionably 

 a subterranean species. 



Order Y. ISOSPONDYLI. 

 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 obtained by us a few times in the Illinois. Apparently frequents 

 deep water. 



