■ypM I II I >i|i tiNi!ilii(l» II WyilHilMH I MWI I I IM MIWIIWi ^l ^ ^^^ UNIVERSITY OF ILLINOIC LIBRARY AT U.nLJAimA champaign NAT. HIST. SURV. ^^^^*-«- DELD Museum of Natural History Bulletin ^ January 1981 .^