LEPIDOPTERA 



759 



Fi,e. 968. — Basilarchia archit>pus. 



and B. arthemts. See Field ('10). This butterfly has the coloring of 

 B. astyanax, with a portion of the white bow of B. arthemts. It occurs 

 in a narrow belt of 

 country extending 

 from southern Wis- 

 consin and north- 

 em Illinois east- 

 ward to the Atlan- 

 tic coast of New 

 England. This is 

 the region which 

 forms the southern 

 limit of the range 

 of B. arthemis and 

 the northern limit 

 of the range of B. 

 astyanax, the place 

 where the two spe- 

 cies meet. The hy- 

 brids vary greatly in the extent of the white band and the red spots. 

 The viceroy, Basilarchia archtppus. — The wings vary in color 

 from a dull ^^ellow orange tinged slightly with brown to a dark cin- 

 namon color; they are bordered with black, and all the veins are 

 edged with the same color (Fig. 968). The fringe of the wings is 

 spotted with white, and the black border on the outer margin contains 

 a row of white spots. 



This species is remarkable for its resemblance to the monarch 

 Danaus archippiis (Fig. 974). But aside from the structural charac- 

 ters separating the two subfamilies which these butterflies represent, 



the viceroy • can be 

 easily distinguished 

 from the species it 

 mimics by its smaller 

 size, and by the pres- 

 ence of a transverse 

 black band on the 

 hind wings. As Da- 

 naus archippptis has 

 been termed the mon- 

 arch, this species is 

 aptly called the vice- 

 roy. 



The larva (Fig. 

 969, a) when full- 

 grown is about 30 mm. 

 in length. The body 

 is humped and naked, 

 with many tubercles. 

 In color it is dark brownish yellow or olive green, with a pale buff or 



Fig. 969. — Basilarchia archippiis: a, larva, b, pupa, 

 c, nest; d, partly eaten leaf before rolled to form 

 nest. (From Riley.) 



