12 
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. Zyaonrctres, Agassiz. ; | | 
Tor Minnows. | 
| 
54. Zygonectes dispar, Agassiz. 
Throughout the State in small lakes, ponds, and creeks, and odt 
curring rarely in the main stream of the Illinois River. Chiefly a 
pond species. | 
55. Zygonectes notatus, Raf.—Tor 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. Funpuius, Lacépéde. — | 
KILLIFISHES. 
56. Fundulus diaphanus, Le Sueur.—Sprine Minnow. 
Abounds in the small lakes and streams of extreme Northern [lh- 
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. AMBLYOPSIDA. (THE Buinp FisuEs.) 
Genus 31. CHoLoGcastER, 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 V.° ISOSPONDYLI. 
Family XV. PERCOPSIDAi. (THe Trout PERcHEs.) | 
Genus 32. Prrcopsis, Agassiz. ; 
58. FPercopsis guttatus, Agassiz.—Trout Prrcu. 
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. 
