The montane relict plethodontid _Aneides hardii_ was studied in the
field and laboratory in 1956-1958. Food items detected in a small sample
of stomachs are listed tabularly. Two roundworms were found to
parasitize the guts of the salamanders; the parasitism looks to be
benign. Subterranean winter inactivity is thought to be an integral part
of the salamanders' lives, and is suggested in part by the life cycles
of the worms. Summer activity appears to occur at the ground surface in
logs and talus, and underground; the latter site is suggested by certain
ratios obtained in the samples, showing adults to outnumber young and
males to outnumber females. The season for egg deposition seems to be in
July and August. Clutch-size is lower than for any other plethodontid on
record. "Incubation" of eggs apparently parallels that characteristic of
other plethodontids.