460 Prof. E. B. Poulton on the Mimetic N. American 



individuals of arthcmis. This development in the mimic 

 of course corresponds to the conspicuous body and leg 

 pattern of the Danaine model. 



LiMENITIS ARCHIPPUS, F. HULSTI, Edw., A BETTER MIMIC 

 THAN ARCHIPPUS ITSELF. — In this Arizona and Utah form, 

 as described and figured by Dr. W. J. Holland (" Butterfly 

 Book," pp. 84, 185^ PI. VII, fig. 5), the black discal band on 

 the hind-wing upper surface is evanescent, although distinct 

 traces of the white band persist as a series of internervular 

 spots. I have not had the opportunity of examining the 

 under surface pattern. Dr. Holland states that the species 

 occurs in Arizona with Danaida hcrenicc and its form 

 strigosa, Bates, and that it more closely resembles the latter. 

 It is not unlikely that the vestiges of the white band on 

 the hind-wings may, when the insect is on the wing, conduce 

 towards a general likeness to the pale-streaked hind-wings 

 oi strigosa. Dr. Holland's figure indicates that, in the reduc- 

 tion of the subapical black of the fore-wing and the appear- 

 ance of the associated white spots, hulsti has been modified 

 from mimicry of the Anosia into resemblance to Danaida. 

 Dr. Holland also draws attention to the dull tint of it? 

 ground colour as compared with Limcnitis aoxhijypus, another 

 change in the same direction. 



LiMENITIS ARCHIPPUS, F. FLORIDENSIS, StRECKER (EROS, 



Edwards), a mimic of Danaida Berenice. 



This example of mimicry is nearly as well known as 

 that of archip]nis for Anosia (see e. g. Scudder, 1. c, p. 718). 

 At the same time, so far as I am aware no attempt has 

 been made to compare the details of the resemblance in the 

 two mimics in relation to the patterns of their respective 

 models. 



That Jioridcnsis, Streck., is a modification of archippus, 

 under the influence of a second Danaine model (bercnice), 

 and is not the result of an independent evolution from 

 arthemis, is at once evident from the persistence in it of 

 features which are truly mimetic in archippus but tend to 

 interfere with the resemblance to the existing Danaine 

 model. Such features are seen on the upper surface, in 

 the heavily blackened veins, and the large black triangular 

 subapical markings on the fore-wing, as well as in the 

 corresponding markings on the under surface. These 

 features are, however, greatly obscured by the deepening 

 of the ground colour into a dark mahogany-brown, like 



