MISCELLANEOUS NOTES, 369 
i then poured some CS? in to a large, flat, evaporating-dish, and placed it 
meat the open end of the box, in such a manner tbat the fumes passed up the 
chimney and mingled with the scent from the female moths. The males, 
however, paid no attention to the new odour, and still fluttered around the 
chimney ; nor did they seem to be disturbed by the fumes of ethyl mercaptan, 
which possesses a2 most nauseating and putrid odour, Evidently the scent 
arising from the females is sufficient to overpower the fumes of CS? or ethyl 
mercaptan, if, indeed, the males have any perception of the latter odours, 
The entire abdomens of five females were cut off and placed upon a table, 
while the males were placed ina large mosquito-net cage about 5 feet away, 
Two males were liberated within five minutes of the time when the abdomens 
were cut off. They both flew to the recently severed abdomens and paid no 
attention to the abdomenless females in an adjacent cage. 
I repeated this experiment many times, but in all subsequent trials the 
males paid no attention either to the severed abdomens or to the mutilated 
females. So far as positive results go, however, it appears that the scent 
which attracts the males emanates from the abdomen of the females, 
When the eggs are cut out of the female she no longer attracts the 
males, nor do the detached eggs attract them, 
Dead or dying females have no attraction, nor do the males come to the 
empty cocoon from which a female has issued, 
When a female remains for some time in any place she seems to impart 
an odour to the locality, for males will continue to come to it for about two 
hours after she has left, 
It is interesting to notice that the females inctease in attractiveness as 
they grow older, This was repeatedly demonstrated as follows :— 
Several females, all of which were about six hours old, were confined ina 
large cage made of mosquito-netting, thus allowing a free circulation of air, 
The same number of females about thirty hours old were placed in another 
similar cage about six feet away from the younger females, Out of thirty- 
seven males thirty-five came exclusively to the cage containing the older 
females, Of the two remaining males one came to the younger females and one 
divided his attention between both cages, When the females are made to 
exchange cages the males will still go to the cage containing the older females. 
Upon testing females thirty hours old against females fifty-five hours old, 
it appeared that they were equally attractive. Of seven males three came to 
the females thirty hours old, one divided his attention between both cages, 
and three came to the fifty-five hour females, It thus appears that females 
about six hours old are not so attractive as are females one or two days old, - 
Virgin females are somewhat more attractive than fertilized ones of the 
same age. When the virgins are placed in a cage five feet away from a cage 
containing an equal number of fertilized females the majority of the 
tnales fly to the virgins. Thus out of eleven males eight came to the virgin 
females, two to the fertilized ones, and one to both cages, 
