24 Hovrll — Mainmah nf the Middle Mississippi VaUc]i. 



town (June 17, 18), Golconda (June 19-21), and Reevesville 

 (June 22). 



In Indiana short stops were made at Cypress, Knox County 

 (June 12), New Harmony (June lo-lo), and Mt. Vernon 

 (June 1(0. 



In Kentucky collections were made at the following localities: 

 Rockport (June 23, 24), Hawesville (June 25-28), INIammoth 

 Cave (June 29-July 5), Midway (July 6-11), and Jackson 

 (July 12-14). 



The region visited during this trip forms the meeting place 

 for Upper-and-Lower Austral Zones, and an effort was made to 

 determine with some exactness the boundary between them. 

 Lower Austral occupies the " sunken lands " and swampy river 

 bottoms of southeastern ^Missouri and western Kentucky, extend- 

 ing north in Missouri as far as Whitewater and Cape Girardeau. 

 A line drawn diagonally across the State through Poplar Bluff 

 and Cape Girardeau will mark quite accurately the upper limit 

 of Lower Austral in Missouri. In Illinois this zone covers the 

 whole of the southern portion of the State from East Cape 

 Girardeau to Golconda, with a narrow^ tongue along the Missis- 

 sippi as far north as Grand Tower. In Kentucky the eastern 

 limits of Lower Austral were not definitely determined, but it 

 doubtless includes the greater part of the counties bordering the 

 Mississippi River, and extends in a narrow belt along the Ohio 

 as far as Berry Ferry (opposite Golconda, Illinois). All the 

 rest of Kentucky is in Upper Austral Zone, excepting a few 

 isolated mountain summits in the extreme eastern part of the 

 State, where small areas of Transition appear. 



Following is a list of the most characteristic Lower Austral 

 species occurring in southern Illinois: 



MAMMALS OF LOWER AUSTRAL ZONE. 



Peromyscus r/ossj/pinus S.i/lcilagus aqaaticus 



Oryzomjfs palv.stris Blarina hrevicauda carolinensis 



Nyct iceius humeral is . 



BIRDS OF LOWER AUSTRAL ZONE. 



CfUharista uruhu Helinaia swainsoni 



Antrostomus carolinensis Protonoteiria citrea 



Peucasa aestivalis bachmani 



