270 
HALF HOURS WITH INSECTS. [Packard. 
The most wonderful cases of protective mimicry among 
caterpillars are afforded by the geometrids or span-worms. 
I have never seen a better example than that afforded by the 
larva of Drepanodes vanes (Fig. 208), which feeds on the 
juniper. It would be difficult in the accompanying figure, 
as well as in life, to tell where the caterpillar begins or the 
juniper twig ends. The body of the larva holds itself out 
stiff and rigid, after the manner of its tribe, with warts over 
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