BUTTERFLIES OF THE VICINITY OF NEW YORK CITY 
51. Green Hair-Streak (J7/iecla damon). 
Found on the wing in May and June, and again in July and Au- 
gust. It occurs only in localities where cedar trees grow, this tree 
furnishing the food of the caterpillar. The butterfly when disturbed 
flies for a short distance and suddenly drops to the ground, folding 
its wings. Owing to the green color on the under side of the wings, 
it is quite difficult to detect the insect in the grass. 
52. Brown Elfin (7/ecla augustus). 
In color on the upper surface this insect is like that of T. irus, but 
it differs greatly from that species as to the under side of the hind 
wings, which have the basal half deep brown and the outer half rusty 
brown, with a row of minute dark spots. It is found in pine woods 
in April and May. 
53- Pine Hair-Streak (Thecla niphon). 
Rare in this vicinity. Found in pine woods, in jApril and early in 
May. It is single-brooded. The caterpillar feeds on pine. 
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