401 
INTERIOR DISTRIBUTION OF ILLINOIS FISHES BY RIVER SYSTEMS 
SPECIES AND NUMBER OF COLLECTIONS OF EACH—concluded 
Districts Sections 
nN 
ay 
Poel 
BO! 
3 S|) 3 
& B/E) & 2 
| oO |e ht) al GS > 5 
Gijedee | eral velar Ss 2 
fas ew esal oa n lee a) he} 
8 Se |} asta a Qn o a 3 
Seen Omics ie et ce apetlia ool se iso ce 
2) 72) S\e) 2) Si elolsl 2] & | a] 3 
Se eee ee Vea ln oll oe an 
Inaimbowsdarter. <<. a- 2 9 | 39 1 2911)4/13) + |+ ]+ 
Etheostoma obeyense..... Navel loecatas ll seecwe eee [ete Coal ratte acetals. 3 Teles oss MOOT OM Ne 
FE SGMAMUGCE DSc o.0 cee 5 ois 3 Resi es foal [ofc fac eeiatoe ale Les sell ah YAM)! Westies | Se 
Fan-tailed darter...... 1 @ sal deol a VW AWTS NW cleseel 23 | ser see) Se 
PSECU YS USt;OTMIS = .\.. =| 1k) Lo leels aoe) 2) £80135) °8 1. Bo) Fe ol ob 
Weast darter. .1..008+% Pes Pac IO [Mien ine wee lace eel lich isi ey clltrcoe |? mgd enith tate Oo | + 
WWilitesioaSSicvs/cr.a scorers i DSS OR Neo e | mleoi|eemene leo. ar dlec sal) oth fens = a 
Mellowabasse ac. ase. 6 Sees (ee lane SWE ase eSiallee we: A ees. eailenclaces ciliates eke yw ae 
Sheepshead........... eect da taal yee eke. lhe iat lhe a yy tle eS SS ee SS 
Maillensithumip, . 22... - Fe A ey SA Woy rl epee Re ae ey Ue Bee eaesite 2On|le=t-an| eon all(ats 
GOMWS FIGEL oe oss. oe. WEI Slee seeders lhcace ese eal beeen aoe Meal eel beoeatell tear 0) (0) 
Wrantdea kumltentt. . . Nie Nee ecte cn el S ce cee elllo oo Saoirse. cgelleee (0) (0) 
BUEbO Per aa aisles ee corel ee Soh esa | Lal fe ee [ene (a Pres a octet ikea) 
THE ILLINOIS BASIN AND THE OTHER DISTRICTS COMPARED 
The key to the distribution of Illinois fishes within the state is the 
species list of the Illinois basin. Covering fully one half the area of [h- 
nois, and extending in a broad belt diagonally northeast and south- 
west across its northern two thirds, this basin contains nearly every 
variety of stream, lake, pond, and marsh to be found between the 
