Pomona Collcfjc, Clarcmont, Cn!if{}nii,i 105 
The butterHifs ( I'i^. Id) greatly rcscinhic the two [)i"ci.cdin)j; spe- 
cies, and the chief differences ha\e alreaily 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 rcHable in ilistinguishing 
the species. The eye-spots on tlie under sides ol the hind wings are 
\ery tiistinct, consisting ol a row ol four i[ulte hirge ones and a 
smaller and less distinct anterioi- one on each wing. The wing ex- 
panse \aries from 2 to ^ inches and the length of the body from ;>4 
to ]/s of an inch. Like the other species, this insect is almost a 
continuous breeder in California, gradually diminishing in numbers 
during the winter months anel becoming \ery plentihil during the 
early spring, summer and fall. 
The \ery great numbers of the caterpillars is sometimes respon- 
sible for some damage to garden crops, but ordinarily only the 
nati\e v'cgetation and cultixatcd ornamentals are consumed. 
The list of food plants is quite large and probably onlv imper- 
fectly kno\\-n. It includes the following: Plunieless thistles (Car- 
duns spp. ) , common or plumed thistles (Ciiinis spp.), milk thistle 
(Silxbiini iiiiiriciiiinii (ia'rtn.), cotton or Scotch thistle (O)wpordon 
(Ucuilhiiiiii Linn.), mallow, Jmsinckiu spp. Sciifcio cUicraria D. C, 
hollyhock, sunflower, beans, burdock and nettle. In this state the 
Amsiiickia spp. and the mallow (Maiva spp.) are the preferred 
food plants. 
