he terrarium; in 1957 this was successful to the extent that
there appeared to be a surplus of food available at all times. We did
not attempt to feed the salamanders any wholly artificial food, such as
ground beef.

Initially, the salamanders, although seemingly healthy and well-fed,
were not fat. Those that we maintained on a presumably minimal diet
remained slender and did not grow in length. Two individuals captured
in 1957, however, were maintained on food in excess, and these grew in
length and in girth; from an initial size of about 37 mm. snout-vent
length (a subadult size) they attained about 45 mm. snout-vent length
(an adult size) in a period of five months. The observations on foraging
behavior were made primarily on these latter individuals.

The salamanders captured prey by pursuit. A salamander would pursue a
fly until it was caught, or until it moved out of the field of action.
The salamanders were attracted by movements of flies, and ignored those
that were completely quiet; predation was oriented almost wholly on a
visual basis. Once they were within 2 to 4 mm. of a fly they would snap
out the tongue to secure the fly; they were successful in capturing
vestigial-winged flies in about 75 per cent of all tries. The relative
success of capture was greater when the animals were fresh from the
field and less after they had become fattened. The vigor of their
pursuit also decreased noticeably once they became fat. About two days
after any new fly colony was placed in the terrarium, a salamander would
take up a position just inside the lip of the milk bottle, which was
placed on its side. From this vantage point the salamanders took heavy
toll of the fly populations, eating both adults and larvae.

Initially the salamanders foraged indiscriminately in daylight or in
darkness. Later, as they became fat, they avoided high light intensity
and were active only at night or under artificial light of low
intensity. The latter pattern of activity is probably typical of the
pattern they maintain under natural conditions. Certainly we never saw
individuals abroad in daylight at Cloudcroft, yet under favorable
environmental conditions they were to be found in sites that required
considerable movement over open areas of the ground surface.

For several months two individuals of _Eurycea longicauda_ were kept in
with _A. hardii_. Foraging of these two plethodontids is nearly
identical, but the tongue of an adult _Euryc