Fig. 1. Head of hatchling blue racer, dorsal view, September 1962, approximately × 3.
Fig. 2. Head of hatchling blue racer, lateral view, September 1962, approximately × 3.
Fig. 3. Head of yearling male blue racer, lateral view, August 1, 1961, a little less than twice natural size.
Fig. 4. Head of adult male blue racer, lateral view, July 16, 1961, approximately × 2. All three snakes from Rockefeller Experimental Tract, Jefferson County, Kansas.
Fig. 1. Abandoned limestone quarry on a hilltop of southward exposure on The University of Kansas Natural History Reservation, in late autumn of 1951. The crevices along the base of the ledge provided favorite hibernating sites for blue racers.