2i8 Annals Entomological Society of America [Vol.11, 



conspicuous than in L. archippus. The appearances I witnessed 

 suggested the possibiHty of the recall of a vanishing feature in 

 consequence of selection based on a likeness to certain white 

 spots present in the new model {herenice) but absent from the 

 old {plexippus) . But many hundreds of specimens from differ- 

 ent localities scattered over the total area of distribution require 

 to be examined from this point of view. An even more interest- 

 ing inquiry would be to trace the range of the floridensis form 

 northward and determine the relationship of its limits to the zone 

 in which herenice becomes scarce and disappears, and above all 

 to ascertain whether floridensis on the borders of its range inter- 

 breeds with archippiis and how far transitional varieties occur. 

 Interbreeding between the two forms, if possible, would be of 

 extraordinary interest. It is also of importance to ascertain 

 precisely how far the one form penetrates the area of the other. 

 Scudder indeed states that floridensis ranges into the Mississippi 

 Valley and Dakota, far beyond the limits of Danaida herenice. 

 It would be deeply interesting to make an exact comparison 

 between such specimens and those from Florida, and also to 

 ascertain the proportion which they bear to typical archippiis. 

 B}^ far the most important feature in the evolution of floridensis 

 is the general darkening of the ground-colour, and the material 

 for such a transformation certainly exists freely in archippus, for 

 the shade of brown \'aries immensely and may often be seen of as 

 dark a tint as in floridensis, but not in my experience of precisely 

 the same shade. The proportion of such dark forms in various 

 parts of the immense range of archippiis would be another inter- 

 esting inquiry. 



The Modification of the Limenitis Mimic of D.'Vnaida 



plexippus into a mimic of the strigosa form of 



d. berenice in arizona. 



The differences between L. archippiis and the form Jiulsti 

 (Edw.) are more striking than those which distinguish y^onc^^w^f^ 

 from the former. The upper surface of the hind Vving of hulsti 

 retains or more probably has recalled distinct traces of the white 

 band, although the black stripe is evanescent. It is probable that 

 upon the wing, these vestigial white markings produce a general 

 likeness to the pale-streaked hind-wing upper surface of strigosa. 

 Other points in which htilsii differs from archippus and approaches 

 strigosa arc the reduction of black and the general appearance of 



