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Rutulus
Butterfly.--The insect very closely resembles the following species in color and markings, but the female is never dimorphic as in P. turnus, and the marginal spots on the under side of the fore wings run together, forming a continuous band, as in eurymedon, and are not separate as in P. turnus. By these marks it may always be distinguished. Expanse, male, 3.50-4.00 inches; female, 3.75-4.25 inches.
Early Stages.--These have been described with accuracy by W. H. Edwards in the second volume of his great work. The caterpillar differs from that of P. turnus in many minute particulars. It feeds on alder and willow. It is the representative on the Pacific coast of its Eastern congener, the common Tiger Swallowtail.