NEW MIMIC EVOLVED FEOM OLD 169 



recently developed. This is especially the case 

 with the conspicuously blackened veins of arcJiip- 

 pus, which are so important a feature in the like- 

 ness to plexippus. These, although obscured by 

 the general darkening, are still recognizable in 

 floridensis, diminishing its resemblance to berenice 

 on the upper surface of both wings and on the 

 under surface of the fore wing. Inasmuch as 

 the details have been recently published else- 

 where, ^ I will only dwell on one further point in 

 the resemblance of floridensis to berenice — and 

 that because the extensive observation of large 

 numbers of specimens is greatly needed. I spoke 

 on pp. 166-7 of the persistent traces of the white 

 band on the hind-wing under surface in many 

 individuals of L. archippus. These are ancestral 

 features, diminishing the mimetic resemblance 

 to D. plexippus. But in D. berenice there are 

 conspicuous white spots towards the centre of 

 the hind-wing under surface, and these, at any 

 rate upon the wing, would bear some resemblance 

 to the ancestral spots of the Limenitis mimic. 

 Now in my very limited experience of floridensis 

 these spots were sometimes exceptionally deve- 

 loped and, outlined with black on their inner 

 edges, were certainly far more distinct and con- 

 spicuous than in L. archippm. The appearances 

 I witnessed suggested the possibility of the 

 recall of a vanishing feature in consequence of 



' Trmis. Ent. Soc. Lond. (1908), 460, 461. See also Scudder, 

 1. c, 718. 



