SMOKY MOTHS. 73 
ment. As soon as the caterpillars are mature they disperse, 
each one searching for and retiring to some sheltered spot, 
in which they construct a tough and oblong-oval cocoon, 
inside of which they change in the course of three or four 
days to a shining brown pupa, about three-tenths ofaninch 
long. Further south two or even three generations are pro- 
duced during a year, but whether the insect is single or 
double brooded in Minnesota is not known. 
6 
Fig. 71 —Harrisima americana Harr.; a. caterpillar; b, pupa; c, cocoon; dande, 
moths; above, acolony ofcaterpillars. After Riley. 
The little moth is of a bluish or greenish-black color; it 
is ornamented with a deep orange-colored collar, and a 
notched tuft at the end of the long body. The moth has 
very narrow wings, which expand nearly an inch across, 
and flies during the warmest hours of the day, when it fre- 
quents flowers. Its flight is rather peculiar, and is quite 
