. Bulletin. Natural history; Natural history. November, 1961 Smith: Amphibians and Reptiles of Illinois 83 Pseiidacris feriaium nee Baird, Pope 1919: »3-4. fAcris gryllus nee Le Conte, Ridgway 1915: 94, 95. Diagnosis.—A subspecies of Pseudacris triseriata (largest Illinois specimen 36 mm. from snout to vent), fig. 68, differing from P. t. feriarum in having shorter legs (tibia less than 47 per cent of snout-vent length in 95 per cent of specimens) ; proportion- ately wider body and smaller head (head length less than 32 per cent of snout-vent length in 80 per cent of specimens) ; usual- ly a d
. Bulletin. Natural history; Natural history. November, 1961 Smith: Amphibians and Reptiles of Illinois 83 Pseiidacris feriaium nee Baird, Pope 1919: »3-4. fAcris gryllus nee Le Conte, Ridgway 1915: 94, 95. Diagnosis.—A subspecies of Pseudacris triseriata (largest Illinois specimen 36 mm. from snout to vent), fig. 68, differing from P. t. feriarum in having shorter legs (tibia less than 47 per cent of snout-vent length in 95 per cent of specimens) ; proportion- ately wider body and smaller head (head length less than 32 per cent of snout-vent length in 80 per cent of specimens) ; usual- ly a distinct triseriate dorsal pattern; and usually a gray, gray-green, or slate ground- color. Variation.—Sexual variation and onto- genetic variation are apparently identical in the two Illinois subspecies of P. triseriata. Individual variation involves occasional reduction of the striped pattern and differ- ences in proportions, although specimens of this race are somewhat less variable than those of feriarum. No marked geographic variation, exclusive of the intergrading populations described under P. t. feriarum. has been discerned, but there is an indica- tion that extreme northern Illinois speci- mens of triseriata may average a bit smaller than those from central Illinois. The ab- sence of a leg-length gradient has been pointed out elsewhere (Smith & Smith 1952). Variation in pattern and propor- tionate head size is similarly nongeographic. The leg-length variation in four samples is given in table 21. Habits.—The western chorus frog ap- pears in temporary pools and ditches in great numbers early in the spring, and its voice is the most familiar frog sound in Illinois. After the breeding season, this species is seldom seen, and its habitat is not well known. Occasional specimens have been taken in summer and fall under rocks. grain shocks, or other objects. It is essential- ly a prairie animal, and it thrives in the most intensively cultivated regions of the state.
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