ORDER IV.—MOTHS AND BUTTERFLIES. 173 
their habits, and can easily be found at home, as they all 
go out to their meals regularly at nine A.m., then return 
toward mid-day, and go out again at three o'clock P.m., 
and return as soon as they have eaten. ‘This destructive 
insect is found in all parts of the Union, and people having 
gardens or orchards should be careful to prevent its ray- 
ages by destroying it in season. 
The Woop-TENT CATERPILLAR (Clisiocampa sylvatica) is 
another not less noxious insect, gaining its own livelihood 
in the same destructive manner upon walnut and oak trees, 
although it is not unfrequently found also upon apple and 
cherry trees. When full grown, in June, it is about two 
inches long. Its head and body are light blue, and its sides 
somewhat of a greenish color. It makes its cocoon and 
webs in the same manner as the preceding ones, and some- 
times destroys whole orchards and large tracts of forests. 
The moths are of a dark-brown color, and its wings ex- 
pand about one and a half inches. ! 
The webs of these two species of caterpillars are made 
of the finest silk, and if properly collected and spun it could 
be manufactured into fine silk stockings or gloves—a profit- 
able amusement for the ladies spending the summer in the 
country. 
Span-worms. 
* 
The Span-worms are little caterpillars, very injurious to 
vegetation, but quite harmless to man, although they are 
very annoying to all who walk through our orchards or 
parks during the month of June, by swinging against the 
face as they hang on the silken thread by which they let 
themselves down to the ground from the trees. The parks 
and promenades of our large cities—New York, Philadel- 
phia, Boston, etc.—abound with them, and they really af- 
ford a serious inconvenience to promenaders, and not un- 
frequently cause considerable fear to the timid upon whom 
