Narrative

Papilio glaucus group contains the following six species (an * indicates that this species is pictured):

SPECIES - - - - LOCATION
P. glaucus* - East USA
P. rutulus* - West USA
P. daunus* - West USA to Mexico City
P. eurymedon* - British Columbia to southern California
P. alexiares* - East Mexico
P. pilumnus* - Arizona to Guatemala

Gerardo Lamas in his 2004 checklist of the Neotropical Lepidoptera changed the name of Papilio daunus to Papilio multicaudata.
Mr. Lamas also made alexiares and rutulus subspecies of Papilio glaucus. Lamas added another subspecies, Papilio glaucus garcia, to this complex. However, researchers of the United States usually keep glaucus, rutulus, and alexiares as separate species.

Other researchers have noted that both Papilio glaucus glaucus and Papilio glaucus canadensis fly together in Michigan, and consequently they have raised Papilio glaucus canadensis to a full species-Papilio canadensis.
A recent discovery in Mexico of a very unusual swallowtail with primitive characteristics should be added to this list:

Species - - - - Location
Papilio esperanza - Mexico

Papilio troilus group contains but two species (an * indicates that this species is pictured):

SPECIES - - - - - LOCATION
Papilio troilus* - southeast USA
Papilio palamedes* - southeast USA and Mexico

Gerardo Lamas also changed the genus of this group to Pterourus.

Taxonomy

References