Vol. 19 , No. 10 
Page 2 
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Illinois because increasing crop acreages and urban expansion are ranidK 
was^be^ng'affected^by' th i”s habi t21'destructTon^ ‘^ Sub5pecieS of 9 ra V s <^n-el 
state F ?nto 0 a P ser“s If U^^eT '? Im "° is ’ wa div i ded 
systems were compared* the upper MississinrT p? Uirre1 ^ from the following river 
River, the Rock River the upper , ^ e M ! SSiSS '> i 
vermilion River, the Wabash River, the L tt e Wabash R?ver hlT. RiV3r ’ thS 
out the state provided us w?th nrn . ?' St f' and many 5c l ulr rel hunters through- 
Illinois gray ZTrral specimens ^re^v! si tld^^e"^?': rZTZ ^ ^ 
sX“ f i ;he wi g s ^ s ;it:^ is ^ ssippi H 
Mississippi. The Wisconsin InH “Pereas the southern subspecies occurs in 
for comparison with our Illinois ^ra^s^r^s?" 1 *" 5 ^ ® S standards 
squir?e U u ana cra S nLrmens aSed ° n Sixtee " Cranial "^rements of the gray 
specimens we reused ^“wseT i nd,cat ° r ° f body si «- ^kOO 
statistical analyses performed on .'computer / 5qU ' rre,S were com P ared with 
Mississippi specimens (^southern'sub^es^ SmaUer 
specimens (the northern subspecies). The iliirLicV• l^ger Wisconsin 
somewhat of a clinal variation in site between M ssisslp'p"? and^ 10 f -"° W 
squirrels. The southern inin^ic . , Mississippi and Wisconsin 
to the southern sub pecTe "'to h^n'm notsY™"^ ^ T m ° re Sirai,ar 
similar to the northern subspecies V ^.rrels are larger and are 
areas in the state seereK mf, ' 9ray s< ) u irrels in most of the 
in the upper Mississippi Rive^Ind Jhe R^t n-" 5ubs P ecies - The gray squirrels 
northern subspecies specimens !° C were y ery simila| - to the 
slightly favored the northern'subspecies 1 " a " lo ” er . 111 ' n0 1 s R 'ver squirrels 
state were more similar to the southern c u y s g u,r rels in the remainder of the 
to concur with the statistical findin q u ^ pecies * Visual observations seemed 
Mississippi River, the Rock River, and the ule^nUnois^R- l!"* UPP6r 
occurrence of partial melanism • • pper . * 1 1 1 no 1 s River have a frequent 
Biochemical tests of selected ™ i H 'l ,ndlcat,ve of the northern subspecies, 
because no differences were de^! ° f 9 ™ y SqUirreiS wera 
apparentIy""the^orthern‘subspecies P ° rU °" ° f ""«»* ia 
TT?** i^-' n ^ SS^'Lr 
p^-T^-.q^riKir: 
the entire lower half of the souther Y ears > f°* squirrels spread over 
squirrels were el^na^d. wTi^hK"^ ! t f J'i' 93 " 35 ”° 5t ° f the qray 
Illinois is not the same. t tbe 9 ra Y squirrel in northern 
