50 BULLETIN NO, 1, DIVISION OF ENTOMOLOGY. 
eggs; and, second, that light is not necessary to this, nor to the growth 
of the larve. I put some larve in a glass bottle and stopped it air- 
tight. They died in twenty-four hours. 
TACHINA: AND ICHNEUMONS. 
During the month of October I think at least half the Cotton- Worms 
1 saw bore the eggs of parasites. Of these I sent specimens to you sev- 
eral times and they were pronounced Tachina aletie Riley, and Pimpla 
conquisitor Say. Since they were determined by yourself, and have 
already been described by you in Bulletin No. 3, I need add nothing 
except my testimony that they are most effective checks to the multi- 
plication of Aletia. I did not see them until the latter part of Septem- 
ber; they were on two broods of worms. Generally there was only one 
egg to a worm, occasionally two, quite rarely three or four. I put many 
of these parasited larvie in cages and fed them; never yet have I seen 
one bring forth the Aletia moth, but always there comes instead the 
imago of the parasite. When occupied by the parasite, the pupa case 
becomes darker than when the Aletia pupa is alive, and the case loses 
those bright yellow circular bands which it shows when the pupa is 
alive. 
The first week in November I found crawling on the ground a half- 
grown worm which bore a cluster of eight eggs. These eggs had not 
the appearance of those of the parasite above mentioned; they had a 
clear greenish hue. I sent it in a wooden box by mail, and regret that 
when the box reached you the worm was not found. I saw no other 
parasite eggs like these. 
The brood of worms which followed the appearance of Tachina aletie 
and Pimpla conquisitor was very small. ‘The cool nights from the 19th 
to 21st October did them no apparent injury, and their destruction must 
have been due to these parasites. 
My observations did not discover any insects that depredate on 
Aletia other than ants, spiders, Tachine and Ichneumons. 
BOLL-WORMS. 
During August and September, Boll-Worms (Heliothis armigera) did 
much damage here. In August, next day after a rain, I saw a green 
soldier-bug (Raphigaster hilaris) almost concealed in a hole made by a 
boll-worm. TI let it remain in the field for a time, watching whether it 
would destroy the worm. I then brought it to the laboratory and fed 
the worm on bolls for five or six days in a cage with the bug. No in- 
jury was done the worm; it reached its full size and went down into 
the ground. I left the bug in the cage, and it died. It evidently fed 
on excrement and the contents of the boll, which decayed because of 
the perforation by the worm. 
PREPARATIONS FOR DESTROYING THE WORMS—PARIS GREEN. 
I employed this mechanically suspended in water, 1 pound to 80 gal- 
lons, to which a little flour paste had been added; it killed the worms 
—— ail 
