191 
No. 151.] 
blackish spots on the top of the first ring. They have sixteen 
feet; the first three pairs being jointed, and ending with a point 
or claw, the others, fleshy tubercles without proper joints. They 
are very impatient of being touched, and on being taken into the 
hand, move with great agility, and by jerks, both forwards and 
backwards. When the trees are shaken, the insects spin down, 
and hang suspended by threads. Probably most of them leave 
the trees in the same way, when their course is finished. In some 
places, it was observed, that they all took their departure during 
heavy showers, towards the end of June. My official engage¬ 
ments, at that time, prevented my observing their progress 
abroad. 
All the specimens sent to me, that remained alive, together 
with a few from my trees, were put into a wide-mouthed bottle, 
and were supplied with leaves. About the 28th of June, some 
of these worms began to cover themselves with a transparent 
web, formed of a few delicate silken threads. One of them was 
transformed to a chrysalis, within its web, on the 5th of July, and 
became a winged moth on the 9th ; having remained in the chry¬ 
salis state only four days. Others were more tardy in their trans¬ 
formations; and one still remains a chrysalis. More than half 
of the whole were unable to take this form, having perished in 
the worm state, from the attacks Of an internal parasite, a minute 
grub, which, after preying on the vitals of its victim, left the 
body and spun itself a little oval whitish cocoon or pod, from 
which it emerged soon afterwards as a tiny four-winged ichneu¬ 
mon fly. 
The chrysalis of the palmer worm is only one quarter of an 
inch long. It is of a pale brown color, and differs from that of 
the common bud worm, in not having any transverse rows of teeth 
around the body. The moth is of an ashen gray color above, 
whitish, and lustrous like satin beneath. The fore wings are 
very narrow, and are sprinkled with a few black dots, three of 
which, near the middle, are larger than the rest. The hind wings 
are also narrow, blackish, and surrounded by very broad fringes. 
The antennae are bristle-formed. The palpi, or feelers, project 
horizontally from the head, in the form of a brush-like snout, and 
