252 
HALF HOURS WITH FN'SECTS. [Packard. 
in these small neglected forms do we want a large number 
of observers. It would be an admirable subject of study for 
ladies, as the leaves containing them can be easily gathered, 
and if laid on wet sand in airy boxes or jars, the moths can 
be bred with much less trouble than the larger species.* 
The walnut and hickory entertain a larger host of insect 
pests than any other deciduous tree; some seventy species 
are already known to draw their supply of food from these 
noble trees. Our black walnut wood comes from the western 
states, particularly Indiana, where the tree grows in the 
greatest perfection. It is estimated that within so short a 
period as ten 3 "ears from the present date, the supply of 
black walnut lumber will be materially diminished. It is 
even now time to be planting groves of these precious trees 
in the western states. When they are in course of cultiva¬ 
tion we can, in the imagination, if a scientist may be allowed 
to use that potent weapon, see the entomological evils which 
will cluster about those groves: a hundred different sorts 
of insects, represented by thousands of individuals, laboring 
away at root, branch, leaf, bud and fruit, unwittingly de¬ 
stroying the sapling, while securing their own means of 
livelihood. 
Not to bore the reader with dry accounts of the beetles 
which occur in the walnut, we would allude to the tigrine 
Goes, which does the most serious damage to the trunks, as 
it bores large holes in the solid wood, lengthwise to the 
tree. The grub is rather large, cream-colored, with the head 
and the segment next to it yellowish. The beetle is a longi- 
corn—we are now prett}" familiar with the appearance of 
these longicorns with their remarkably long antennm — and 
is brown, covered with a dense tawn}" pubescence, with a 
broad dark band beyond the middle of the wing covers, and 
♦Full directions for rearing caterpillars may be found in “Directions for 
collecting and preserving Insects,” prepared for the use of the Smithsonian 
Institution by the writer. 
28 
