GENERAL CHARACTERISTICS OF BATRACHIANS. 301 
beetle-trap into the Vivarium, will hide under the moss until 
night, when, leaving their places of security, they fall a prey 
to their natural enemies. Cockroaches are not only most use- 
ful animals as kitchen scavengers, but also as a very suitable 
source of food supply to the keeper of a Vivarium. A little sugar 
should be placed in the case for those which are not eaten by the 
Batrachians. Flies, during the day, can be quickly and easily 
caught in a trap prepared for the purpose, and which is repre- 
sented by Fig. 78. In the lower vessel (an ordinary glass fly- 
catcher) there is placed some dry sugar, a piece of meat, or a 
ty, 
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Fic. 78.—IFLY-CATCHER. 
dead mouse or bird, The flies enter from below, and gradually, 
in considerable numbers, find their way into the inverted bottle 
placed over the hole in the small wooden platform above. When 
one wide-mouthed bottle containing flies is removed, another 
should be immediately put in its place. Of course, this fly-catch- 
ing arrangement ought to be placed out of doors when flesh of 
any kind is used as a bait. ‘ 
Maggots, which can generally, in summer, be obtained 
without difficulty, may be thrown down upon the spot pre- 
pared for the worms. Those which are not eaten at once 
