The caterpillars are partial to the foliage of wild cherry trees, but are found on a great variety of plants.
The dark female form reveals its relationship to the paler form by the stripes on the under side. On the upper side the insect shown on [Plate CXV] is very black and shows no stripes at all. I possess females with yellow wings on one side and black on the other. The identity of the forms named by Linnæus turnus and glaucus could not be more forcibly shown than by these specimens, in which the two are united by the vital force which called them into being.
PL. CXVI
(3) Papilio rutulus Boisduval, [Plate CXVI], ♂ (The Pacific Tiger).
Closely resembling P. turnus, which it replaces on the Pacific Coast in Washington and southward. The female is never dimorphic; the marginal light spots on the under side of the fore wings run together forming a continuous band, and are not separate as in P. turnus. Expanse 3.50-4.25 inches.
The larva feeds on alder and willows.
(4) Papilio eurymedon Boisduval, [Plate CXVII], ♂ (The White-striped Tiger).
Belonging to the same group as the two preceding species, but distinguished by the pale creamy white color of the ground-color of the wings, and by the fact that the submarginal spots on the under side of the fore wings form, as in P. rutulus, a continuous band. Expanse 3.50-4.00 inches.
The caterpillar feeds on Rhamnus californicus and other plants. The insect ranges from Mexico to British Columbia and eastward to Colorado.