140 LASIOCAMPIDS. 
tected spot in which to spin its cocoon. When she!tered 
spots have been found, usually under projecting objects, such 
as roofs and upper fence-boards, they spin spindle-shaped 
cocoons of white and almost transparent silk; when fin- 
ished they fill the spaces between the silken threads with a 
sulphur-yellow ‘substance, which in drying becomes a 
powder. Inside these cocoons (most beautiful objects) they 
change to pupe, from which emerge, in from twenty to 
twenty-five days, the moths, ready to start another brood 
for the following year. This caterpillar, although quite 
numerous in Minnesota, has not created as much alarm as 
the one deseribed next. 
THE FOREST TENT-CATERPILLAR. 
(Clistocanipa distria Hub.). 
phenlorgen ¢ferd, tivee eniaceediceee! Amer picy | ae os ea 
This caterpillar (Fig. 139) is even more common than 
the Orchard Tent-caterpillar which it closely resembles. It 
does not, however, construct a large tent. The caterpillars 
feed upon the foliage of various species of forest trees, such as 
oak, ash, maple, etc., but they prefer linden or bass-wood; they 
