Lucanoid Coleoptera. 75 



varied development of the mandibles to which these 

 gigantic insects are subject. The form and character of 

 these organs of the var. max. in their normal condition, 

 as shown in the figure, lead me now to place this species 

 in the section of Odontolahis to which 0. Stevensii be- 

 longs. The female is as yet unknown. 



Genus Chalcodes. 



Galcodes, Westw. Ann. Sci. Nat. ser. 2, i. 118 (1834) ; 

 and in Hope, Cat. Luc. 



In my former Catalogue I included this genus in Odon- 

 tolahis as a section comprising four species, ceratus, cin- 

 galensis, nigrita, and intermedius. As it now appears 

 desirable to reinstate the genus Chalcodes, it is necessary 

 to modify and amplify the short characters assigned to it 

 (corpus metallicum, tibiae et tarsi subtus setosi) by Pro- 

 fessor Westwood, in Mr. Hope's Catalogue : — 



Corpus metallicum, vel nigrum, nitidum ; caput antice 

 angustatum, pone oculos modice inflatum, inarmatum ; 

 tibiae anticas ut in Odontolabe saepe curvatae, hae intus 

 et tarsi subtus setosi. 



Heterochthes hrachypterus, Westwood. 



This rare species, discovered by the late Mons. Mouhot, 

 in Siam, has recently again been received by Dr. Kaup, 

 of Darmstadt, and disti-ibuted in various collections ; the 

 specimens in question are stated to have been received 

 from the Island of Nias, on the Coast of Sumatra, but 

 the habitat thus assigned is, I believe, erroneous. 



Fam. Cladognathid^. 



Admitting the difficulty I experienced in proposing a 

 more satisfactory arrangement of the insects pertaining 

 to the genus Gladognathus of my former Catalogue (see 

 p. 21), I was then compelled to content myself with a 

 mere sectional arrangement. Since that period much 

 valuable information has become available, which induces 

 me on the present occasion, to propose a fresh grouping 

 of the numerous species contained in it, and the allied 

 genera, Homoderus, Cyclommatus, Prismognatlius, Can- 



