ADAPTIVE COLORATION 219 
for hours along the eaten or torn edge of a basswood leaf, in 
which position it bears an extremely deceptive resemblance to 
the partially dead border of a leaf. The weevils that drop to 
the ground and remain immovable are often indistinguishable 
Fic. 242. 
Caterpillar of Schizura ipomae clinging to a torn leaf. Natural size. 
to the collector on account of their likeness to bits of soil or 
little pebbles. Everyone has noticed the extent to which some 
of the grasshoppers resemble the soil in color; Trimerotropis 
maritima is practically invisible against the gray sand of the 
seashore or other places to which it restricts itself; and Dis- 
sosteira carolina, which varies greatly in color, ranging from 
ashy gray to yellowish or to reddish brown, is commonly found 
on soil of its own color. 
Adventitious Resemblance.—l{, instead of hastily ascrib- 
ing all cases apparently of protective resemblance to the action 
of natural selection, one inquires into the structural basis of 
the resemblance in each instance, it is found that some cases 
can be explained, without the aid of natural selection, as being 
