6 BUTTERFLIES AND MOTHS. 
The metamorphosis of this order of insects is complete, 
and we can hardly imagine a greater difference in form than 
Fig. 9.—Legs. Enlarged. 
that between the egg, caterpillar, pupa and imago of the 
same insect. (See Figs. 16 and 19). 
The eggs, which are always, if possible, deposited upon 
or near the food needed by the caterpillars or larve, are of 
many different forms. A few are shown in Fig. 10. They 
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Fig. 10.—Different kinds of eggs. 
vary also incolor, though most of them are greenish, or 
greenish-white. Some eggs are quite smooth, others are 
beautifully ornamented with numerous ribs or other pro- 
jections; some are deposited ‘singly, others in more or less 
regular_masses, sometimes carefully covered with glue or 
scales. Some eggs hatch in a very short time after being 
deposited, while others remain for half a year exvosed to all 
