190 DISEASES OF THE COTTON PLANT. 
the young larvae of the " bore-worm," or " boll-worm," which 
certainly are sometimes found in the terminal shoots of 
cotton ; but, when this is the case, the buds are generally 
either eaten from the outer calyx, or the bud itself perfo- 
rated, and the former flaring open; whereas, the buds 
which turn black, as before described, are closely enveloped 
in the outer calyx, and present a triangular form, with a 
dry and dark-brown appearance. 
Upon close examination, a number of extremely minute 
larvse, measuring a little over one-twentieth of an inch in 
length, were found in the injured shoots. The insects, 
when confined in a bottle with some young terminal cotton 
shoots and buds, to ascertain if they really injured the plant, 
were observed immediately to attack each other with great 
animosity ; and, in a short time, one of the strongest larvae 
killed and sucked out the juices from three of its compan- 
ions, and also from a cotton-louse which had been placed 
in the glass. The same insect, however, was afterward 
plainly seen, on several occasions, to suck sap from the ter- 
minal shoot and young buds ; and as there were no more 
insects for it to feed upon, it must necessarily have per- 
fected its growth and transformations afterward on vege- 
table juices alone. Almost every terminal shoot which 
was diseased^ had in it one or more of these minute larvse 
or perfect insects. 
The pupae are of a reddish brown, about one-twentieth 
of an inch in length, with eyes of a reddish-brown color. 
The perfect insect is rather more than one-twentieth of an 
inch in length, also with reddish-brown eyes, yellowish an- 
tennae, and a head and thorax black ; tlie triangular space 
between the wings is black; the wings are brownish yellow, 
barred in the centre with two triangular black marks ; the 
ends of wings diamond-shaped, of a light color ; the upper 
