September, 1945 



Brown & Yeager: Squirrels in Illinois 



459 



to 100 females, table 4. Of 60 spring October, 58 per cent were males and 42 



juveniles taken hy the writers and b}' per cent were females. The sex ratio 



hunters, 55 per cent were males and 45 of all juvenile gray squirrels for which 



per cent were females; of 38 summer records were obtained, 61 males and 48 



juveniles collected in late September and females, was 127 males to 100 females. 







1 



Fig. 5. — Juvenile (left) and adult male fox squirrels. Note smoothed, blackened appearance 

 of scrotum in adult and the smaller, less conspicuous scrotum in juvenile. Piatt County, late 

 January, 1944. Gray squirrels of the same ages show the same characteristics. 



