118 PSYCHE [December 
light escaped observation. The ratio of the sexes can therefore be given only in a 
general way from the notes which I made concerning three are lights. 
On lamp No. 1 were found about 530 o'c' and 350 2 9 
“e ce 2 ce ce oe 310 hice oe 990 Qo 2) 
6c oe “ce 3 ce “ec ce 390 os oe ce IAN Q 2) 
12302 CNGh aa LORS 1 
The ratio of males to females was therefore in this case 1.5:1. Strange to say, 
the aberration punctigera Teich was entirely absent among the large number of speci- 
mens. ‘These observations at Raymond give further evidence for the statement 
that females of the brown-tail moth are attracted to electric lights almost as strongly 
as the males, although the flight of the female is particularly affected by the weather 
conditions which prevail at the time of emergence. "That the females at Raymond 
had just emerged on the 17th of July is shown by the fact that they went into copu- 
lation at the light. They must undoubtedly have just emerged, for if the females 
had left the pupa cases one or more days before, they would have copulated previously, 
since it is known that members of the Liparide and related families copulate during 
the first twelve hours after emergence. The certainty that females of the brown-tail 
moth also fly in numbers to electric lights on favorable evenings, has therefore an 
economic value in the destruction of this species. As the females have naturally 
not laid eggs before the flight to the lights, the regular destruction each night of the 
adult females would prevent a possible later egg-laying on the trees in the neighbor- 
hood. 
I might also mention a simple yet effective method which was utilized this year 
for the destruction of brown-tail moths in various places in New Hampshire. On 
still nights, during the flight of the moths they built under the electric arc-lights bon- 
fires, which were well moistened before being lighted. The smoke thus produced did 
not ascend so far up as the height of the lamp so that the light was not obscured. 
The brown-tail moths circling about the light soon flew into the clouds of smoke, then 
falling into the fire to their death. As a result there were windrows of the brown-tail 
moths 4—5 em. high about the periphery of the bonfire, and one can judge of the 
enormous numbers of moths which were killed by this means. 
