. Bulletin. Natural history; Natural history. November, 1961 Smith: Amphibians and Reptiles of Illinois 191. Fig. 183.—Distribution of Heterodon platy- rhinos. The species apparently occurs through- out Illinois, although there are small localized areas where it appears to be absent. Solid circles indicate localities represented by speci- mens examined during this study; open circles, localities represented by published records believed to be valid. The lower map depicts the total range of the species in the United States. Illinois Distribution.—The eastern hog- nose snake is state-wide in occ
. Bulletin. Natural history; Natural history. November, 1961 Smith: Amphibians and Reptiles of Illinois 191. Fig. 183.—Distribution of Heterodon platy- rhinos. The species apparently occurs through- out Illinois, although there are small localized areas where it appears to be absent. Solid circles indicate localities represented by speci- mens examined during this study; open circles, localities represented by published records believed to be valid. The lower map depicts the total range of the species in the United States. Illinois Distribution.—The eastern hog- nose snake is state-wide in occurrence in Illi- nois, fig. 183. The snake is evidently rare in much of the central part of the state, espe- cially in areas that were originally muck prairie. Its rarity in these areas may be ex- plained by its apparent avoidance of soil rich in organic matter, or its near extermination from areas intensively cultivated. The spe- cies is abundant throughout the southern half of Illinois, particularly on floodplains, in forest-edge habitats, and in dry, open woods where the soil is clay or sandy loam. I The hognose snake is apparently common in I the sand areas of northern Illinois, where \ the abundance of toads, the principal food of Heterodon, is probably an important factor. Although undocumented by specimens, published records for the following localities are believed valid and are indicated on the distribution map by hollow symbols: Alex- ander County: Horseshoe Lake (Minton & Minton 1948) ; Hancock County: 7 mi. S Nauvoo (Langebartel 1947) ; Hardin County: Shawnee National Forest (H. Smith 1956) ; Knox County: 2]/i mi. E Galesburg (Adcock 1922) ; Madison Coun- ty: (Hurter 1911); Monroe County: Waterloo (Burt 1935) ; Peoria County: (H. Garman 1892); Rock Island Coun- ty: Rock Island (Yarrow 1882fl) ; St. Clair County: Belleville (Yarrow 1882^) ; Tazewell County: (H. Garman 1892); Union County: Saratoga (H. Garman 1892); Wabash County: Mount Carmel (Yarrow 1882fl)
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