PROTECTIVE RESEMBLANCES, AND MIMICRY 915 
the daytime, dressed in a bright livery of red and blue. 
‘Ie can not be mistaken for any other, and his flaming 
breast and blue stockings show that he does not court con- 
cealment. He is very abundant in the damp woods, and I 
was convinced he was uneatable so soon as I made his 
acquaintance and saw the happy sense of security with 
which he hopped about. I took a few specimens home 
with me, and tried my fowls and ducks with them, but 
none would touch them. At last, by throwing down pieces 
of meat, for which there was a great competition among 
them, I managed to entice a young duck into snatching up 
one of the little frogs. Instead of swallowing it, however, 
it instantly threw it out of its mouth, and went about jerk- 
ing its head, as if trying to throw off some unplcasant 
taste.” 
Certain animals which are without spccial means of 
defense and are not at all formidable or dangerous are yet 
so marked or shaped and so behave as to present a threat- 
ening or terrifying appearance. The large green caterpil- 
lars (Fig. 137) of the Sphinx moths—the tomato-worm is a 
familiar one of these larve—have a formidable-looking, 
Fig. 187.,—A ‘‘tomato-worm” larva of the Sphinx moth, Phlegethontius carolina, 
showing terrifying appearance. 
sharp horn on the back of the next to last body ring. 
When disturbed they lift the hinder part of the body, bear- 
ing the horn, and move it about threateningly. As a mat- 
ter of fact, the horn is not at all a weapon of defense, but is 
quite harmless. Numerous insects when disturbed lift 
the hind part of the body, and by making threatening mo- 
