I HE BROWN-TAIL .Morn. 
I:;:; 
With the warm days of late April and early May the 
little caterpillars emerge from their winter's home, the 
balance of which they often devour before going to the 
opening buds, upon which they feed greedily. The first 
emergence noted in Massachusetts was on March 18, 1898, 
Fig. 18.— Elm leaf curled by aphis. 
(From Weed.) 
PlG. 19.— Eggs of Rusty Tussock Moth. 
the 29th of April being given as about the last of their 
appearance. 
At Durham, N. H., the largest number of caterpillars 
emerged on May 6, 1905, April 29, 1906, and May 1, 1907, 
the whole time of emergence lasting for from a week before 
to a week or so after these dates. 
Usually about 400 caterpillars emerge from a nest, though 
many of the smaller nests contain only 200 and a few nests 
on oak trees will contain 900 to 1,000. These large nests 
have usually been formed by the caterpillars hatching from 
several egg masses forming a common web. 
