436 
List oF Maps 
The general map of the distribution of collections (Map IV.) shows, by the 
location of the red spots, all the localities from which collections of fishes have 
been made by us in the work of the Natural History Survey. The distribution maps 
for the various species indicate in the same way all the localities from which repre- 
sentatives of the species have been taken. For an accurate idea of the significance 
of these species maps, each should be compared with Map IV. 
The following numbered list of the counties of the state corresponds to the 
figures on these maps. 
1. Jo Daviess 35. Hancock 69. Madison 
2. Stephenson 36. McDonough 70. Bond 
3. Winnebago 37. Fulton 71. Fayette 
4. Boone 38. Mason 72. Ettingham 
5. McHenry 39. Tazewell 73. Jasper 
6. Lake 40. McLean 74. Crawford 
7. Cook 41. Vermilion 75. Lawrence 
8. Du Page 42. Champaign 76. Richland 
9. Kane 43. Piatt Hie “Clay; 
10. Dekalb 44, Dewitt 78. Marion 
11. Ogle 45. Logan 79. Clinton 
12, Ibe 46. Menard 80. St. Clair 
13. Carroll 47. Cass 81. Monroe 
14. Whiteside 48. Schuyler 82. Randolph 
15. Rock Island 49, Brown 83. Washington 
lo.) Mercer 50. Adams 84. Perry 
in lenny. Sy eike 85. Jefferson 
18. Bureau D2 SCout 86. Wayne 
19. Putnam 53. Morgan 87. Edwards 
20. La Salle 54. Sangamon 88. Wabash 
21. Kendall 55. Christian 89. White 
22. Grundy 56. Macon 90. Hamilton 
23. Will 57. Moultrie 91. Franklin 
24. Kankakee 58. Douglas 92. Jackson 
25. Iroquois 59. Edgar 93. Williamson 
26. Ford 60. Clark 94. Saline 
27. Livingston ole eColes 95. Gallatin 
28. Marshall 62. Cumberland 96. Hardin 
29. Woodford 63. Shelby 07: sPope 
30. Stark 64. .Montgomery 98. Johnson 
ol) Reorad 65. Macoupin 99. Union 
$2, Knox: 66. Greene 100. Alexander 
33. Warren 67. Calhoun 101. . Pulaski 
34. Henderson 68. Jersey 102. Massac 
I. & Il. The three sections of Illinois, northern, central, and southern, and 
the ten stream systems of the state: I., the Galena District, II., the Rock 
River System, III., the Illinois River System, IV., the Lake Michigan 
drainage, V., the Mississippi River drainage, VI., the Kaskaskia River 
System, VII., the Wabash System, VIII., the Big Muddy River System, 
IX., the Saline River System, and X., the Cairo District. 
III. Glacial geology of Illinois. 
IV. Localities from which collections were made. 
V.—CII. Distribution of species. 
CIII. Northern species (@) and southern species (4) in Illinois, 
