Genus Anosia 
Chrysalis.— The chrysalis is stout, cylindrical, rapidly taper¬ 
ing on the abdomen, and is suspended from a button of silk by 
a long cremaster. The color of the chrysalis is pale green, orna¬ 
mented with golden spots. 
The larvae of the genus Anosia feed for the most part upon 
the varieties of milkweed ( Asclepias ), and they are therefore 
called “milkweed butterflies.” There are two species of the 
genus found in our fauna, one, Anosia plexippus, Linnaeus, which 
is distributed over the entire continent as far north as southern 
Canada, and the other, Anosia berenice, Cramer, which is con- 
llned to the extreme southwestern portions of the United States, 
being found in Texas and Arizona. 
(i) Anosia plexippus, Linnaeus, Plate VII, Fig. i, $ (The 
Monarch). 
Butterfly.— The upper surface of the wings of this butterfly is 
bright reddish, with the borders and veins broadly black, with 
two rows of white spots on the outer borders and two rows of 
pale spots of moderately large size across the apex of the fore 
wings. The males have the wings less broadly bordered with 
black than the females, and on the first median nervule of the 
hind wings there is a black scent-pouch. 
Egg .—The egg is ovate conical, and is well represented in 
Fig. 4 in the introductory chapter of this book. 
Caterpillar.— The caterpillar is bright yellow or greenish-yel¬ 
low, banded with shining black, and furnished with black fleshy 
thread-like appendages before and behind. It likewise is well 
delineated in Fig. 16, as well as in Plate III, Fig. 5. ’ 
Chrysalis.— The chrysalis is about an inch in length, pale 
green, spotted with gold (see Fig. 24, and Plate IV, Figs. 1-3). 
The butterfly is believed to be polygoneutic, that is to say, 
many broods are produced annually; and it is believed by writers 
that with the advent of cold weather these butterflies migrate 
to the South, the chrysalids and caterpillars which may be un¬ 
developed at the time of the frosts are destroyed, and that 
when these insects reappear, as they do every summer, they 
represent a wave of migration coming northward from the 
warmer regions of the Gulf States. It is not believed that any 
of them hibernate in any stage of their existence. This insect 
sometimes appears in great swarms on the eastern and southern 
coasts of New Jersey in late autumn. The swarms pressing 
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