8 
OBSERVATIONS UPON 
The larva, when fully grown, measures a little 
over three-fourths of an inch in length, is greenish 
in color, with the thoracic, legs and cervical shield 
black or blackish. The head and cervical shield 
are often lighter after the last moult. 
Packard speaks of this insect as probably being 
double brooded, the first brood of larvae appearing 
in June and the second in August and September. 
He also thinks that the pupae of the second brood 
hibernate and that the moths appear early in the 
spring and lay the eggs for the first brood of larvae. 
Such is not the habit of the species here, although 
ii| may be farther south. 
This insect is one of very wide distribution. 
Robinson’s descriptions were made from specimens 
taken in Maine, where it is said to be common, and 
it has been reported as far south as Georgia and 
Texas and west to California. Aside from the 
food-plants above mentioned it "has been reported 
as feeding upon oak, hickory, horse-chestnut, soft 
maple, elm and wild cherry. I have also found it 
occasionally feeding on box-elder. 
This insect was exceedingly abundant in many 
places in Colorado last summer and did a large 
amount of injury, especially to fruit trees and rose 
bushes which, in many cases, were entirely defolia¬ 
ted in the latter part of June. Figure 4 is from a 
photograph taken in a young apple orchard in 
Greeley, Colo., last summer, where not a green leaf 
was left on any of the trees. The trees with leaves 
showing in the picture are elm trees in the street, 
which were not attacked. 
