264 
HALF HOURS WITH INSECTS. [Packard. 
extremely difficult to detect them, so well did their pepper- 
and-salt and greenish hues agree with the gray and green 
rocks. On another occasion, while entomologizing on some 
peculiar, light gneiss rocks overgrown with gray lichens, a 
couple of hundred miles farther north on the Labrador coast, 
I found it impossible to detect the Anartas, though resting 
almost under my feet, so closely did these owlet moths re¬ 
semble the rocks over which I clambered. Again, on the 
hills above the Moravian settlement of Hopedale, thousands 
of the beautiful dun-tinted Chionobas of different species 
fluttered feebly over the lichen-clad rocks, the underside of 
their wings corresponding exactly in color with the ground 
Fig. 200. fig. 201. 
Chionobas semidia. Grapta progne. 
on which they rested. This scene is repeated on that bit of 
Arctic landscape, the extreme summit of Mt. Washington, 
where the Chionobas semidia (Fig. 200, from Tenney’s Zool¬ 
ogy) occurs ; as well as in other Alpine peaks of Europe and 
the Rocky Mountains. A geometrid moth (Marmopteryx 
strigularia ), which inhabits the mountainous regions of the 
eastern states from Vermont to West Virginia, Jias the same 
peculiar marbled under surface of the hind wings, and also 
an allied species found in the Sierra Nevada. 
The under side of the Grapta butterflies (Fig. 201, Grapta 
progne, right side) have the color of dead leaves, and as they 
sit in paths with their wings folded over their backs would 
8 
