[ek HAS Sa SS Se | 

oO 
Figure 10,--FIR emission of Herse cingulata (F.). Jagged line is FIR emis= 
sion, solid line is internal thoracic temperature, (a) Peak of emission at 
39°C, (9.25 ); (b) dropoff as wing vibration ceases; (c) FIR emission 
remains high because of heating of exoskeleton while internal thoracic 
temperature drops quickly; (d) internal temperature is almost at room 
temperature of 24°, with external FIR temperature now dropping and 
closing gap; (e) moth starts to warm up again (note slight curve of in- 
ternal temperature line as wing frequency starts up); (f) internal tem- 
perature and FIR emission climb together as wing vibration continues. 

was constructed with a shelf and a window at 
either end. A silver chloride filter (3 to 30u) 
with a blackbody emitting behind it was placed 
at one window. At the opposite window was a 
dummy check. So as to indicate visits to 
either end of the box, a piece of black paper 
was placed on each shelf in front of the op- 
posing windows. The criteria for visits were 
counts taken at various times during the dark 
period and the number of scales left behind on 
the black paper by moths visiting each end of 
the cage. This system was employed to elimi- 
nate any light that would result from using 
168 

photoelectric counters. Results were over- 
whelmingly for the end containing the silver 
chloride filter with the IR radiator. Only a 
few scales had been deposited on the dummy 
check shelf, whereas the shelf with the emitter 
was completely covered with scales as well 
as defecation from the visiting earworm moths. 
During the week, 30 visits to the blackbody 
emitter were observed but only 1 to the op- 
posite check, 
These experiments are considered as valid 
proof (1) that night-flying moths generate con- 
siderable FIR radiation in the 9- w region and 

