( 447 ) 



XXI, Mimetic North Amei^ican 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 20th, 1907.] 



Plate XXV. 

 CONTENTS. 



PAGE 



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 (Basilarghia) 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 of the mimetic pattern of L. archippus 



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



(a) Hhvd-wiiig Under Surface of Limenitis archippus , 456 



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



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



(d) The white spots on Body and Ap)pendages of Limenitis 



archipp-\is ........ 459 



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



archippus itself 460 



Limenitis archippus, p. ploridensis, Strecker (eros, 



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

 THE PAPILIONINE MODELS OF LIMENITIS ASTYANAX . 462 

 The Geographical uistribdtion op 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 OP THE TDRNUS FEMALE OP 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 op p. PHILENOR .... 469 



The EVOLUTION of the mimetic pattern op Limenitis 



(BaSILARCHIa) ASTYANAX PROM THAT OF THE NON-MIMETIC 



L. ARTHEMIS 471 



L. ASTYANAX A SECONDARY MIMIC OP THE PaPILIO MIMICS 



op philenor 472 



Transition between arthemis and astyanax . , , 473 

 TRANS. ENT. SCO. LOND. ] 908. — PART III, (DKC.) 



