0^ >: 

 < Z 



d 2 



Q. t- > 



bi 8 § 



FIG. 9-14 Monthly variations in total population size of differ- 

 ent animal groups in a temperate deciduous forest (Trelease 

 Woods) of central Illinois. The data for each month are averages 

 of 10-14 year records, (a) Diptera larvae: (b) Lepidoptera 



© 



© 



/ 



/ 



larvae; (c) spiders; (d) Homoptera; (e) snails; (f) centipedes; 

 (g) invertebrates (macrofauna) in ground; (h) non-forest 

 species. 



Grassland, forests, and forest-edges 139 



