Pomona College, Claremont, California 105 
The butterflies (Fig. 10) greatly resemble the two preceding spe- 
cies, and the chief differences have already been pointed out in dis- 
cussing them. The presence of the rosy color on the wings is quite 
characteristic, though this is by no means reliable in distinguishing 
the species. The eye-spots on the under sides of the hind wings are 
very distinct, consisting of a row of four quite large ones and a 
smaller and less distinct anterior one on each wing. The wing ex- 
panse varies from 2 to 3 inches and the length of the body from 34 
to 7% of an inch. Like the other species, this insect is almost a 
continuous breeder in California, gradually diminishing in numbers 
during the winter months and becoming very plentiful during the 
early spring, summer and fall. 
The very great numbers of the caterpillars is sometimes respon- 
sible for some damage to garden crops, but ordinarily only the 
native vegetation and cultivated ornamentals are consumed. 
The list of food plants is quite large and probably only imper- 
fectly known. It includes the following: Plumeless thistles (Car- 
duus spp.), common or plumed thistles (Cnicus spp.), milk thistle 
(Silybum marianum Gertn.), cotton or Scotch thistle (Onopordon 
acanthium Linn.), mallow, dmsinckia spp. Senecio cineraria D. C., 
hollyhock, sunflower, beans, burdock and nettle. In this state the 
Amsinckia spp. and the mallow (Malva spp.) are the preferred 
food plants. 
