[ 385 ] 



XIX. A Monograph of the Odontolabini, a subdivision of the Coleopterous Family 

 Lticanidw. By Franz Leuthner, Ph.D., Member of the Imperial Boyal Zoological 

 and Botanical Society of Vienna i. 



Received and read ISth December 1883. 



[Plates LXXXIV. to XCVII.] 



CONTENTS. 



^^''^'^ page 385 



Part I. iNTKODUCTOEr Eemarks 3giT 



(1) Variability of the Lucanidaj in general, with special reference to the Odontolabini . . 388 



(2) Variabilit)- and Poh-morphism in the Mandibles 391 



(3) The Question of Species in the Lucanidae 392 



(4) Odontolahis alces, Fabr. (a morphological study) 395 



(n) Evidence of the Specific Identity of 0. dux, Westw., 0. akes, Fabr., and 



0. cmningi, Hope 393 



(b) Modification of the Mandibles in the Male 397 



(<•) Modifications of various Parts of the Body 402 



(5) Evidence in favour of the Gradual Differentiation of the Male Forms by Modifica- 



tion of the Mandibles 4O3 



(6) Divergence of Species in the Odontolabini 4O6 



I. JVeoluGunits jqq 



n. Odontolahis ^ng 



(i.) Group of 0. alces 4IO 



(ii.) Group of 0. stevensi 412 



(iii.) Group of 0. btcrmeisteri 412 



(iv.) Group of 0. wollastoiii 4I4 



(v.) Group of 0. castehiaudi 4I5 



m. Heterochthes 4I9 



Part II. Descbiptiok' op the Geneka and Specibs of Odontoiabiiii 4I9 



(1) NeolvMmus 420 



(2) Odontolahis 432 



(3) Heterochthes 479 



Part III. Geogeaphicai, Distribtjiion of the ODomoLABrNi 481 



Identifications 4gg 



Index of Genera and Species 4gg 



Explanations of the Tables of Measurements 487 



Description of the Plates 4g8 



Preface. 

 When I commenced these investigations in the autumn of 1881 nothing was further 

 from my thoughts than the writing of this Monograph. The direction of my studies 



' Translated from the author's German manuscript by "W. F. Kirby, Assistant in the Zoological Department, 

 British Museum. 



VOL. XI. — PART XL No. 1. — Wove7nber^JA85. 3 m 





