LEPIDOP TER A. 
407 
rows of blue or green spots on the outer third of the hind 
wings ; the spots of the inner row vary greatly in width in 
different individuals. On the lower surface there is a reddish 
orange spot in the discal cell of the fore wings, and one on 
the discal vein ; on the hind wings there are two orange spots 
similarly situated, a third at the base of cell IT, and a row of 
Fig 478 . — Basilarchia arthemis. 
seven spots just within a double row of submarginal blue 
or green spots. 
This species occurs throughout nearly the whole of the 
Eastern United States south of the 43d parallel of latitude. 
The larva feeds on many plants; among them are plum, 
apple, pear, and gooseberry. 
The Hybrid Purple, Basilarchia astyanax-arthemis .— 
There occurs, along a narrow belt of country extending from 
southern Wisconsin and northern Illinois eastward to the 
Atlantic coast of New England, a butterfly that closely re¬ 
sembles the Red-spotted Purple, but which has more or less 
of the white band of the Banded Purple. This is believed 
to be a hybrid between these two species. The region in 
which it occurs is that in which the ranges of the two species 
overlap. North of this region, of these three forms only the 
Banded Purple occurs ; south of it only the Red-spotted 
Purple is found. 
The Viceroy, Basilarchia archippus (B. ar-chip'pus).— 
* The wings vary in color from a dull yellow orange tinged 
