The Moths and Butterflies 433 
the foliage of various plants, and when full-grown most of them descend 
and burrow into the ground to pupate. The chrysalid is naked, with firm, 
dark-brown wall, and is distinguished by the odd jug-handle-like sheath 
for the developing long imaginal _ proboscis. A few larvae pupate on the 
Fig. 622. —Pholus achemon, above, and Pholus pandorus, below. 
(After Lugger; natural size.) 
ground in a slight cocoon made of silk and a few leaves tied together. The 
insects hibernate in the pupal stage; a few are said to be double-brooded. 
The name sphinx, applied to these moths by Linnaeus a century and a half 
ago, is suggested by the curious attitude assumed by the larvae when dis¬ 
turbed; the front part of the body is lifted (Fig. 620) clear of the object 
on which the insect is resting, and the head is bent forward on the thoracic 
feet. This position may be held rigidly for hours. 
Of the many species found in this country we can refer to but a few of 
the more familiar or beautiful or interesting ones, and these references may 
be made brief because of the colored figures which are .grouped in our frontis¬ 
piece. These figures render descriptions unnecessary. 
