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 years, 

 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 



83 



