224 EN TOMOLOGY 
Protective Mimicry.—This interesting and highly involved © 
phenomenon is a special form of protective resemblance in 
which one species imitates the appearance of another and 
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A, Anosia plexippus, the “ model’; B, Basilarchia archippus, the *‘ mimic.’ Natural size. 
better protected species, thereby sharing its immunity from 
destruction. Though it attains its highest development in the 
tropics, mimicry is well illustrated in temperate regions. A 
familiar example is furnished by Basilarchia archippus (Fig. 
243, B), which departs widely from the prevailing dark colora- 
tion of its genus to imitate the milkweed butterfly, Anosia 
