|
|
| Salt Lake, Utah; 7/90 form brucei | Salt Lake City Utah May 1997 form bairdi |
Generally common, known from the midwestern USA east of
the Rockies to the Dakotas, south to S California and New Mexico. Porbably
only a subspecies of P. machaon. Form
bairdi (which
lacks the extensive yellow) is more frequent in the southern parts
of its range - both forms can arise from the same clutch of eggs in differing
proportions.