. SEC Figure 2. Audiospectrogram (narrow band) of the mating call of a male plains leopard frog {Rana blairi) recorded on 24 April 1970 in a farm pond km ( mi) east of Highway 51 and km ( mi) north of McLean County Highway 8 (SVV 'A, NW 'A, Section 2, T25N R2E), Hudson Township, McLean County, Illinois. Frequency (in kilohertz) is along the ycrtical axis: time (in seconds) is along the horizontal axis. The complete first sequence (first four notes) and the initial part of the second sequence (last two notes) are illustrated. C;ioacal temperature = ; air temperature

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. SEC Figure 2. Audiospectrogram (narrow band) of the mating call of a male plains leopard frog {Rana blairi) recorded on 24 April 1970 in a farm pond km ( mi) east of Highway 51 and km ( mi) north of McLean County Highway 8 (SVV 'A, NW 'A, Section 2, T25N R2E), Hudson Township, McLean County, Illinois. Frequency (in kilohertz) is along the ycrtical axis: time (in seconds) is along the horizontal axis. The complete first sequence (first four notes) and the initial part of the second sequence (last two notes) are illustrated. C;ioacal temperature = ; air temperature = °C; water temperatiue = 'C (the male was calling in the water). Snout-vent length = 68 mm (measured alive). Recorded by Brown: photographed by Gerald B. Liebenstein.

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Keywords: ., bookauthorillinoisnaturalhist, bookcentury1900, booksubjectfrogs