( 447 ) 



XXI. Mimetic North American species of the Genus 

 Limenitis (s. 1.) and their models. By Edward B. 

 PouLTON, D.Sc, M.A, LL.D. (Princeton), F.R.S., 

 elc, Hope Professor of Zoology in the University 

 of Oxford, Fellow of Jesus College, Oxford. 



[Road November 20tli, 1907.] 



Plate XXV. 

 CONTENTS. 



PAOE 



Introduction 448 



THE DANAINE INVASION OF THE NEW WORLD AND 

 THE CONSEQUENT MODIFICATION OF NORTH AMERI- 

 CAN SPECIES OF LIMENITIS 449 



The evolution of Limenitis (Basilarchia) archippus, Cr. 

 (misippus, F.) and its forms as mimics of the in- 

 vading Danaines 452 



The evidence that Limenitis archippus occurs at the 

 same time and place as its model 454 



The evolution op the mimetic pattern op L. archippus 

 from that of the non-mimetic L. arthemis . . . 454 



(a) Hind'iving Under Surface of Limenitis arcliippus . 456 



(b) Fore-wing Under Surface of Limenitis archippus . 457 



(c) The Upper S\irf ace of Limenitis archippus . . . 458 



(d) The white spots on Body mid Appendages of Limenitis 



archippus . . . . . . . . 459 



Limenitis archippus, f. hulsti, Edw., a better mimic than 



archippus itself 460 



Limenitis archippus, f. floridensis, Strecker (eros, 



Edwards), a mimic of Danaida Berenice . . . 460 

 THE PAPILIONINE MODELS OF LIMENITIS ASTYANAX . 462 

 The Geographical distribution of Papilio (Pharma- 



COPHAGUS) PHILENOR AND ITS PRIMARY, SECONDARY AND 

 tertiary MIMICS 463 



The evidence that Papilio philenor and its mimics 

 OCCUR at the same place and time .... 466 



The RELATION OF THE TURNUS FEMALE OF PaPILIO GLAUCUS 



to (1) the primary model, p. philenor ; (2) its co- 



mimics in the Papilionin^ 467 



Secondary mimetic resemblances between the three 



Papilionine mimics of p. philenor .... 469 



The evolution of the mimetic pattern op Limenitis 



(Basilarchia) astyanax from that of the non-mimetic 



L. arthemis 471 



L. astyanax a secondary mimic of the Papilio mimics 



of philenor 472 



Transition between arthemis and astyanax . . . 473 



TRANS. ENT. SOC. LOND. ] 908. — PART III. (DEC.) 



