Genus Anosia 
southward are arrested by the ocean. The writer has seen 
stunted trees on the New Jersey coast in the middle of October, 
when the foliage has already fallen, so completely covered with 
clinging masses of these butterflies as to present the appearance 
of trees in full leaf (Fig. 79). 
Fig. 79.—Swarms of milkweed butterflies resting 
on a tree. Photographed at night by Professor C. F. 
Nachtrieb. (From “ Insect Life,” vol. v, p. 206, by 
special permission of the United States Department of 
Agriculture.) 
This butterfly is a great migrant, and within quite recent yeais, 
with Yankee instinct, has crossed the Pacific, probably on mer¬ 
chant vessels, the chrysalids being possibly concealed in bales of 
hay, and has found lodgment in Australia, where it has greatly 
multiplied in the warmer parts of the Island Continent, and has 
thence spread northward and westward, until in its migrations it 
has reached Java and Sumatra, and long ago took possession of 
8 ? 
