56 



Cabbage Butterfly Pontia rapce 6i 



Vertebrated Robber-flv Promachus vertehraius 52 



Pennsylvania Bumblebee Bomhus pennsylvanicus I75 



Impatient Bumblebee Bomhus impatiens i75 



Bumblebee Bomhus auric omiis I75 



(Rose-gall) Rhodites nehulosus 60 



No animals were taken here which were dependent upon the sumac 

 hickory, crab-apple, or smilax. Pclidnota lives upon the grape, and 

 grapes are primarily woodland or forest-margin rather than prairie 

 plants. Schistocerca is also probably a marginal species. On the flow- 

 ers of Silphium terebinthinaceum were taken Orchehmum vulgare, 

 Chaidiognathiis pennsylvanicus, and Bombtis pennsylvanicus, aun- 



comus, and impatiens. 



The persistence of woodland vegetation m this locahty, m spite 

 of the repeated mowings and burnings, shows that it has much vigor, 

 and would, if undisturbed, in a few years shade out the prairie vege- 

 tation and restore the dominance of the forest. With such a change m 

 the vegetation there would of course be a corresponding change m the 

 animals. 



DESCRIPTION OF THE FOREST HABITATS AND ANIMALS 



I. The Bates Woods, Station IV 



The Bates woodland area is located about three and a half miles 

 northeast of Charleston on the farm that was owned by Mr. J. I. Bates, 

 and consists of about 160 acres. It includes a bottom-land area near 

 the Embarras River, and extends up the valley slope on to the upland. 

 It is isolated from the trees bordering the river (PI. X, fig. i) by a 

 narrow clearing, and from those on the northeast, north, and north- 

 west by another clearing (PI. XI) ; on the south and southwest it 15 

 continuous with partially cleared areas, which extend south to the Big 

 Four railway track. 



The river bottom-land is undulating and rises rather graduafly 

 toward the base of the bluffs. The bluff line is irregular on account of 

 the ravines which have been etched in it, the largest of which forms 

 the southern boundary of the region examined. The upland is rela- 

 tively level The soils on the bottom are darker colored, except in 

 places near the base of the blutf, and at the mouths of the ravines 

 where the upland soil has been washed down. The upland soil is pre- 

 sumably the "light gray silt loam" of the State Soil Survey (Moultrie 

 County Soils, lU. Exper. Sta. Soil Rep., 191 1, No. 2, p. 23). AU of 



