LEPID OP TERA . 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 II, 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 



