Dimorphism and PoIpno7yhism in Butterjiies. 27 



So great is the contrast that it was described as 

 Ehodocera Lorquini by the celebrated Dr. Boisduval, who 

 had previously named the male, and it was also described 

 as Meganostoma Helena $ by Mr. Eeakirt. 



In Colias Pelidue, which occurs in Labrador, the male 

 is of a sulphur yellow, while the female is of a rather 

 dingy white, thickly sprinkled below on the secondaries 

 with greenish brown, and similar examples occur else- 

 where, especially among the alpine and sub-arctic species 

 of the genus. 



Among those species which do not appreciably vary in 

 the sexes are some of the most strongly marked species, 

 species, moreover, which are either cosmopolitan or have a 

 very extended range over a great part of the earth's sur- 

 face, and upon which the differing climatic conditions of 

 their various habitats seem to have been powerless to effect 

 any change. Of these the most marked are Vanessa 

 Antiopa, called in England, where it is a great rarity, the 

 Camberwell Beauty, Pyrameis Atalanta, or Bed Admiral 

 Butterfly, and the species to which Mr. Kirby in his 

 catalogue gives the locality as " Mundus," Pyrameis Car- 

 dui, the so-called Painted Lady, an opprobrious name in 

 my estimation. 



On the other hand, the species which varies the most 

 in the sexes is the beautiful species named Diadema 

 Missipus, from Indian Biver, Florida, which differs so 

 greatly that no one unacquainted with it would suppose 

 that the two sexes were of the same genus, still less of the 

 same species. This species forms a sort of link between 

 the genus Limenitis, in which the colors are largely 

 purple brown and white, and the genus Danais, which is 

 tawny, with black and white markings. Indeed, the 

 female of Missipus may be classed with the mimetic 

 or mimicking forms, "but that," as Budyard Kipling 

 would say, ■' is another story." 



Between these two conditions — of no variation and 



