•rr 



'\-\\.<i 



BULLETIN 



OF THE 



ILLINOIS STATE LABORATORY 



OF 



NATURAL HISTORY 



Urhana, Illinois, U. S. A. 



7 



Vol. VII. XAphil, 1907 Article IX. 



AN ORNITHOLOGICAL CROSS-SECTION OF ILLINOIS IN AUTUMN. 



BY 



S. A. FORBES, Pli.D. 



