( 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, 

 etc., Hope Professor of Zoology in the University 

 of Oxford, Fellow of Jesus College, Oxford. 



[Read November 20t]i, 1907.] 



Plate XXV. 

 CONTENTS. 



PAOK 



Introduction 448 



THE DANAINE INVASION OF THE NEW WORLD AND 

 THE CONSEQUENT MODIFICATION OF NORTH AMERI- 

 CAN SPECIES OF LIMEXITIS 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 of L. archippus 



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



(a) Hind-wliKj Under Surface of Limenitis a)xMppns . 456 



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



(c) T7ie Upper Surface of Limenitis archippus . . . 458 



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



archippns . 459 



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



archippus itself 4G0 



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 (Puarma- 

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

 mimics IN THE PAPILIONINiE 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. SCO. LOND. 1 008. — PART III. (DEC.) 



