56 BULLETIN NO. 1, DIVISION OF ENTOMOLOGY. 
- In progress of this experiment I observed something that may be of 
interest. Pups were numerous, and most of them were inclosed in a 
half roll of the leaf, as usual. The liquid, applied generally to the leaves, 
was seen to run down into these nests, and many of the pup were set 
to wriggling. Ithen gathered a great many of them, and tried the emul- 
sion on them, of various degrees of strength, and applied in different 
ways: First, of this strength (30 to 1), thoroughly wet by hand or dipping 
them in the liquid; all died; stronger solutions the same; weaker not 
tried. Secondly, a dozen, gathered with the stalks, so as to leave them 
hanging, as in the patch, ina cluster, were sprinkled, as in the field, and 
then caged. Within a week two flies came out. The cases whence 
they issued were found not saturated with the oil. All the others ex- 
hibited traces of oil, and, though perfectly dead, showed no other signs 
of disease or parasites, and very little progress toward putrescence, 
I thought these two last experiments worth reporting, as they may 
have a bearing upon the destruction of chrysalids of other genera. 
But my conclusion I think it also proper to state. Although much of 
it may be considered deduction from imperfect experiment, I do not 
perceive any hope of kerosene competing with the arsenious poisons 
for cotton-worm: Ist, it can never be so cheap; 2d, it must touch the 
insect to be effectual. Paris green sticks to his food, and whenever he 
eats leaf enough he must die. I think, however, for cabbage-worms 
and any collections of caterpillars the kerosene is the thing. I in- 
tended to try it on some social caterpillars I found congregated on 
hickory trees, but in one night after finding them they had completed 
their moult and dispersed. Circumstances then intervened which pre- 
vented my identifying my interesting hickory worm. 
I have many chrysalids of Aletia yet, which I keep dry, but other- 
wise exposed to the climate, to see how they will winter. 
There is only one other set of observations to report upon; and, look- 
ing at its barrenness of results, this deserves no notice. For several 
days and nights I had good opportunity to watch the moths of the 
cotton field. The owner of a perambulatory sorghum mill and evapo- 
rator was at work in one corner of a cotton field from 5th to 15th of 
September. I took up my camp with him. The nights and mornings 
were unusually cool. In the very early morning hours I could find 
nothing, see nothing. The habits of Aletia, which I was after, remain 
still a mystery as to my skill. But I can say that up to 10 or 11 o’clock 
(p. m.) they were astir inclouds. Attracted by the fires at the sorghum 
works, they perished in countless numbers. But nearly all of those ex- 
amined at the mill were males. The operator told me that where he 
had last made up a crop of the cane, somewhat farther south and west, 
the flies had been so numerous as to compel him to cover up his evapo- 
rator and suspend work until morning. The nights at that time were 
warmer. 
[A severe malarial attack at this time (18th September) put a stop to 
this kind of investigation. | 
