382 Mr. Roliind Triinen on 



Geuus Callidryas, Boisduvul. 



• Callidryas Florella. 



rapilio Florella, Fabricius, Syst. Ent. p. 470. 



I think that there can be no longer any reasonable doubt, 

 that L'hadia, Boisd. (Sp. Gen. Lep. i. 6 17) , i« only the yel- 

 lower form of Florella, ? . In 18G2, HopfFer (Peters' Reise 

 nach Mossamb. Ins. p. 365) pointed out that the colouring 

 of the ? Florella differed from that of the S , varying from 

 pale to gamboge-yellow on the upperside, but did not 

 connect the deeper-hued examples with Ixhadla. Mr. 

 Butler (Cat. Di. Lep. desc. Fabr. in Coll. B. M. pp. 224-5) 

 has recently published some remarks indicating a belief 

 that the two constitute but one species j and I may add 

 that not only does the constant occurrence of the two in 

 the same localities favour that belief, but that on one 

 occasion near D'Urban, Port Natal, I took a white S and 

 yellow ? in copula. Females of the paler colouring are 

 certainly scarcer than the others ; but Mr. Bowker 

 writes that he has noticed them in Basuto-land, and Mr. 

 Hemtson possesses one from Madagascar, which resembles 

 the yellowish white specimen from Bourbon, figured in 

 M. Maillard's "Notes sur Vile de la Ecunion {Bourbon)," 

 published in 1862. 



HopflFer notes {loc. cit.) the great difference in size 

 that prevails in this Callidryas, observing that his smallest 

 example expanded only 1 in. 9 liu., while the largest was 

 over 2 in. 6 lin. While I have remarked no specimen 

 less than 2 in. in expanse, I have measured a fine Basuto- 

 land r^ from Mr. IBowker,* and a Trans-Vaal $ from 

 Mr. Ay res, both of which expand 2 in. 9 4 lin. 



The genus Callidryas is celebrated in the warm regions 

 of the earth, and notably in tropical South America, for 

 vast assemblages of apparently migrating individuals. 

 Darwin, Schomburgk, Bates, and Spruce are among those 

 who have given us the most graphic accounts of these 

 innumerable hosts, which progress steadily in a particular 

 direction. Mr. Bates' observations led him to believe 

 that the migrating hordes were composed of males only, 



* This iudiviilutil possesses iu high perfection the row of radiating 

 silky hairs on the inner margin of the fore-wings, noted in my llhop. Afr. 

 aust. p. 68, as occurring iu two males from British Knffraria. 



