192 NORTH AMERICAN INSECTS. 
Germany on the potato-vine; and in France, Egypt, and 
Asia, on the thorn-apple (Datura stramonium). 
There are several species of hawk-moth caterpillars found 
upon our garden and forest trees, on grape-vines and other 
shrubs, which are quite injurious to vegetation, but which 
can be easily seen on account of their large size, and de- 
stroyed without much trouble, or they may be secured in 
boxes for the purpose of raising their beautiful moths. One 
of these injurious insects is the caterpillar of ; 
The Four-HORNED SPHINX (Ceratomia quadricornis), Fig. 
45, which is generally 
found, in the month of 
July, upon our lime, 
poplar, and especially 
elm-trees, which are 
frequently stripped en- 
tirely of their foliage 
by its ravages. The 
beauty of this caterpil- 
lar universally attracts 
attention, its body be- 
ing of a light-green 
color, with oblique 
white lines upon each 
side, and ornamented 
with four notched, 
short horns on the 
shoulders. When full 
grown it is about three 
inches long. It soon 
enters the ground, 
changes into a chrys- 
alis, and makes its ap- 
pearance as a perfect 
hawk-moth during the 
Four-horned Sphinx. 

