BUTTERFLIES OF THE VICINITY OF NEW YORK CITY 
into the following subfamilies: Euploéinee, Nymphaline, Satyr- 
ine and Libythene. 
Subfamily EuPLoz£In&. 
This subfamily is almost entirely confined to the equatorial 
regions of America and Asia. The butterflies average far above 
medium size, and have rounded, somewhat elongate wings. 
Their flight is powerful and sustained, although usually slow. 
They often sail high in the air on expanded wings. The eggs 
are slender obconic, vertically ribbed and transversely striate, 
and are laid singly on the food-plant. The caterpillars have two 
or more segments each with a pair of long, slender, flexible 
filaments above. The chrysalids are always suspended from a 
silken button at the hinder part. Only a single species of this 
family is found in this vicinity—the Milkweed Butterfly. 
17. Milkweed or Monarch Butterfly (Anosia plexippus). 
Very common in this vicinity, appearing in May and June, but 
becoming more numerous in August and September. In years when 
conditions have been favorable to the insects’ increase, immense 
swarms of the butterfly may often be seen in autumn migrating 
southward. It inhabits North America, South America, West Indies, 
Sandwich Islands, Australia, New Zealand and the Malay Archipelago. 
The caterpillar lives on milkweed, and the chrysalid is pale green with 
golden markings. 
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