. Bulletin. Natural history; Natural history. November, 1961 Smith : Amphibians and Reptiles OF Illinois 33 deposits approximately 100 eggs in a pro- tected depression. Incubation depends on the length of time before the eggs are inun-. Fig. 23.—Distribution of Ambystoma opac- um. Hatching indicates the presumed range of the species in Illinois; solid circles indicate localities represented by specimens examined during this study; open circles, localities rep- resented by published records believed to be valid. The lower map depicts the total range of the species in the United States. dated, a
. Bulletin. Natural history; Natural history. November, 1961 Smith : Amphibians and Reptiles OF Illinois 33 deposits approximately 100 eggs in a pro- tected depression. Incubation depends on the length of time before the eggs are inun-. Fig. 23.—Distribution of Ambystoma opac- um. Hatching indicates the presumed range of the species in Illinois; solid circles indicate localities represented by specimens examined during this study; open circles, localities rep- resented by published records believed to be valid. The lower map depicts the total range of the species in the United States. dated, and the hatching time is accordingly variable. Normally, metamorphosis occurs the following June or July. Illinois Distribution.—J. opacum occurs throughout the southern third of Illinois, north along the Indiana-Illinois border probably to Iroquois County, fig. 23, but it appears to be abundant only in the southern fourth of the state. Although undocumented by specimens, published records for the following locali- ties are believed valid and are indicated on the distribution map by hollow symbols: Randolph County: (Hurter 1911); Un- ion County: Cobden (H. Garman 1892); Wabash County: Mount Carmel (Yar- row 1882«). Ambystoma talpoideum (Holbrook) Mo!e Salamander Salamandra talpoidea Holbrook 1838:117, pi. 39 (type locality: sea islands on the border of South Carolina). Amblystoma talpoideum, Cope 1868:173. Ambystoma talpoideum, Hay 1892a:582. Diagnosis.—A medium-sized, extremely stout, broad-headed salamander (largest Illinois specimen 114 mm. in total length), fig. 24, blue-black or brownish black and usually unmarked above except for a sug- gestion of a longitudinal light stripe on the basal third of the tail; usually 11 costal grooves, counting the impressed line above the hind limbs; head width 22 to 32 per cent of the snout-vent length; snout-vent length 52 to 58 per cent of total length; toes over- lapping when legs are adpressed; midven- tral dark stripe usually co
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