


Figure 1l,--Sensing head of bolometer pointing at blackbody emitter. Moths were trapped on either side of 
emitter with Stickum @) in totally dark room, 
(2) that they can locate minute thermal sources 
of FIR radiation in total darkness, They would, 
therefore, be detectable to each other as 
thermal points of FIR radiation against the 
cool ambient background of nighttime tem- 
peratures, 
Experiments were conducted with a 
Nernst® glower source, having a wide radia- 
tion spectrum in the IR region from 1 to 30yn. 
The glower was used to irradiate eyes and 
antennae of moths. High-intensity IR at a 
thermal parameter of 120° F. focused into the 
169 
eye killed the moths in an average of 60 sec- 
onds. Low-intensity IR at thermal parameters 
of 85° to 929 between 3 and 30 yu, focused on 
the antenna or eye, elicited various flight, 
antennal, and sexual responses at thermal 
parameters of 85° to 92°, Low-intensity IR 
at a thermal parameter of 92°, focused on 
the ocelli of larvae, elicited fecal pellet 
deposition as well as searching and head 
scanning by the larvae (Callahan and Cox 
1965), 
