. Bulletin. Natural history; Natural history. 56 In iNOis Naturai, History Survey Bulletin Vol. 28, Art. 1 dorsal stripe. Unlike P. cincnits, this species includes occasional specimens intermediate between the two color phases, and the zigzaj: stripe can be discerned in some interme- diates only by careful examination. Amonfz specimens with the red or yellow stripe, the lobulations extend posteriorly for the entire body lenj^th in approximately one-third of the material at hand, but for at least half of the body length in the majority of the specimens. A specimen from Hardin Coun- ty is anomal
. Bulletin. Natural history; Natural history. 56 In iNOis Naturai, History Survey Bulletin Vol. 28, Art. 1 dorsal stripe. Unlike P. cincnits, this species includes occasional specimens intermediate between the two color phases, and the zigzaj: stripe can be discerned in some interme- diates only by careful examination. Amonfz specimens with the red or yellow stripe, the lobulations extend posteriorly for the entire body lenj^th in approximately one-third of the material at hand, but for at least half of the body length in the majority of the specimens. A specimen from Hardin Coun- ty is anomalous, with the middorsal band straight-edged on one side and strongly an- gulated on the other. Habits.—In the early spring, zigzag sal- amanders are extremely abundant under flat rocks on wooded hillsides. In habits they are similar to red-backed salamanders but they are perhaps more rigidly restricted to a rock habitat. During the summer and fall they are rarely found; presumably they retreat into caves or rock crevices. The life history of P. dorsalis is probably similar to that of the related P. ciiiereus, although dorsalis probably lays its eggs in crevices of rock outcrops rather than in logs. Illinois Distribution.—This species has been confused with P. cinereus because of the difficulty of describing adequately the rather slight differences between the two species and because each species has a uni- colorous phase. Most of the early refer- ences to P. dorsalis in Illinois were based on presumptions that this species would be found eventually in eastern Illinois or were obvious misidentifications of P. cinereus. Prior to 1948 the only published record for dorsalis was almost certainly in error, as the record, based on specimens AMNH 23297-3301 and labeled Urbana. Illinois, has not been substantiated by additional collections. Moreover, suitable habitat for this species is completely lacking in the vi- cinity of Urbana. During the first season of field work for the stu
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