f" ' Lucanoid Coleoptera. 57 



Odontolabis gracilis, Kaup. 

 Odontolahis inceqtialis, Kaup. 



These two insects, described by Dr. Kaup (Col. Heffc. 

 iv. 7, 1868) as new species, were captured by Herr v. 

 Rosenberg in the Island of Nias, situate on the Vv'^estern 

 Coast of Sumatra, and are stated by the author to be 

 allied, the first to 0. dux, Westwood, and 0. helUcosiis, 

 Laporte ; the second to 0. Stevcnsii, Thomson, and 0. 

 Dejeanii, Seiche. Dr. Kaup having kindly added to my 

 collection specimens of both insects, I am in a position 

 to state, that 0. gracilis must be considered as the var. 

 max. of 0. hellicosus, having fully developed mandibles 

 (this being the only instance of such development which 

 has hitherto fallen under my notice), and that 0. in- 

 cequalis must be referred to 0. hicolur, Olivier, of which 

 it appears to be a singular geographical variety, having 

 the coloration on the elytra of a very dark chesnut, 

 whereas in 0. hicolor it is of a pale fulvous; in all other 

 respects, however, the two insects appear to assimilate. 

 Upon submitting my views with regard to the species 

 in question to Dr. Kaup, on his late visit to England^ 

 he unhesitatingly coincided with my opinion. 



Neolucanus SwinJwei. 

 Bates, Proc. Zool. Soc. 1866, p. 346, fig. 



An interesting addition to the genus Neolucanus, dis- 

 covered by Mr. Swinhoe in the island of Formosa, and 

 described by Mr. H. W. Bates {loc. cit.) with other 

 interesting new species. Gemminger and von Harold 

 locate it in Odontolahis, but it is evidently more appro- 

 priately placed in Neolucanus, the mandibles of which 

 seldom exceed the length of the head, and are arcuate, 

 and in the species pertaining to the first section are (in 

 the var. max.) armed with either one or two strong sub- 

 erect teeth placed near the apex. Although closely 

 resembling N. castanopUrus from Northern India, the 

 author in his description points out the various ditter- 

 ences; and the sub-erect tooth near the apex of the 

 mandibles of N. Swinhoei appears to be entirely wanting 

 in the numerous specimens of N. casta no2jter us which 

 have fallen under my notice. 



