LIGHT AND BAIT TRAPS. 
319 
the light, Zj shall illumine these regions, causing the insects which have 
entered to seek exit at these places where no outlet is to be found. 
Curved metal strips, // j } serve best to hold the net expanded in upward 
and lateral directions. From the insects caught the injurious ones 
should be selected and crushed in the folds of the net or otherwise 
killed, while the beneficial insects are set free through a large opening, 
z, in the base <»f the net. An easy way to keep this opening closed is 
to pucker it together and lay a brick or chunk, 2, upon it, or tie it to- 
gether. 
This device, constructed and tested some years since, was intended 
to overcome such objections as have already been made to light traps, 
or in former pages, and also for the use of naturalists in collecting in- 
sects for their cabinets. 
The indiscriminate killing of insects i> certainty very unscientific and 
not to be recommended, yet where parties wish to adopt this abandoned 
practice to avoid the trouble of selecting the good from the bad, in 
which they often work against their own interests, a trough of destruc- 
tive substance may be placed beneath the bottomless inlet, the end of 
the trough resting on the cleat, c. In case it is for drowning the in 
sects, the trough should bear a projecting ledge a short space above the 
liquid, as in the bait traps to be noticed farther on. Such a trough 
•applied with attractive bait may be used as a bait trap apart from or 
in combination with the glass, which it still a valuable auxiliary to it. 
But when bait is Deed it is preferable that the insects be not mixed 
in the bait and drowned thereby, it is better to use a shallow trough 
with Oaring sides, or merely substitute Cor it a board on which the bait 
may be spread. Then the insects feed without drowning. In seeking 
the food they crawl down through the slot shaped opening of the bot- 
tom of t lie trough shaped hopper, tow ai d the bait below it. Therefrom j 
instead of trying to escape through the hopper-slot, they fly off into 
the larger apace BB1 rounded by the net, and are thereafter to be selected 
and freed or killed. 
1 find the cotton moth is extravagantly fond of juicy canned peaches, 
and believe these are the best and most convenient bait for all seasons 
of the year, though any other sweet, succulent fruits may be employed 
in their season. Where divers species of insects are sought several 
kinds of bait may be inserted at once. 
JStiWs Cotton-Moth Exterminator (Plate LXI, Fig. 3).— u This exter- 
minator is of the class w hich lures to self-destruction the mother moth 
on her first flight to deposit the worm-producing egg, and its essential 
peculiarities are (1) a day and night attractor -lantern, and (2) such em- 
baying of the lantern side that the approaching moth falls a more cer- 
tain prey into the usual trap-basin below. 
f Iu tlir cut A and A arc sides of the at tractor-lantern ; these sides are of opal glass, 
which by day is brilliant white and in twilight or by night, lighted by a lamp within, 
ia most attractively luminous; each pane of the lantern is tlauked by an out-reaching 
