1096 The American Naturalist. [December, 
very rarely seen wandering around except after a rain, hence it is 
quite generally believed by non-naturalists to rain down. 
Their movements are quite rapid, and very quickly disappear 
if placed where they can crawl into the grass or among leaves. 
They will overcome quite prominent obstacles, and in getting 
down from a considerable height they use the tail as a fifth hand, 
like a monkey, and can practically support themselves nearly their 
whole length. The aquatic form also frequently makes use of the 
tail as a kind of hand in making its way around in the submerged 
plants. Sometimes they give out a kind of shrill squeak or 
cry, but this is not very frequent. The adult aquatic ones 
occasionally emit a similar cry also. 
Although I have been unable to keep them in confinement 
from the egg until their final transformation into the adult viri- 
descent form, I have been able to obtain from a locality where 
they were especially abundant suck a complete series that it is 
believed that the terrestrial life continues until the autumn of the 
third or the spring of the fourth year after hatching,—that is, when 
they are two-and-a-half or three years old. 
Transformation into the Adult—As previously stated, this 
transformation may take place either in the autumn or the springy 
and in either of these times the transformation may take place: 
(1) while still on dry land; (2) after entering the water. 
1. As the red Diemyctylus attains maturity (judging from 
the generative organs) it gradually assumes a brownish tint, 
which merges slowly into a viridescent coloration of greater or 
less intensity in different specimens. This may occur in the 
autumn without entering the water, but if placed in the water 
it willingly remains (Kelly, ’78). In two specimens under my 
own observation, kept in a jar containing moist rotten wood, 
leaves, etc., the change came about the middle ot September. 
One was of an especially brilliant red, but within two weeks 
1 The favorable place mentioned above is Worcester, Otsego Co., N. Y., along one of 
the headwaters of the Susquehanna River. ‘The specimens were obtained for me by 
my nephew, Albert Gage. About 12 miles from Ithaca the red form is also exceedingly 
abundant in and near an upland forest. This forest is not far from marshy places which 
are sources of small tributaries to the Seca get River on the south and Cayuga 
Lake on the north. 

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