BY R. J. TILLYARD. 751 



and width (A. punctata is 4 mm. long, by 1 mm., wide) and in 

 lacking the interstitial puncrtures peculiav to that species. 



It is possible tliat this fossil may prove to be of some consider- 

 able geological interest, especially if a further search in the same 

 locality were to reveal specimens of the genus Ademosyne in 

 great numbers For these beetles are very common in the 

 Ipswich beds; and, indeed, form a unique fauna there, since 

 they have hitherto not been found in the Wianamatta Shale or 

 in any other Mesozoic beds. If, therefore, it could be shown, 

 bv further investigations, that there exists a definite A dernosyiie- 

 zone at Ipswich, and that the same zone occurs at Narellan at 

 the horizon of this specimen, it would be logical to regard the 

 result as a proof of the correlation of the Ipswich Fossil Bed 

 with this upper zone of the Wianamatta Shale Beds. Such a 

 conclusion would agree very well with the indicated view that 

 the Wianamatta Beds at St. Peter's and Glenlee {i.e., from six 

 to three hundred feet lower in horizon than the supposed Ade- 

 mosyne-zone), show a fauna and Hora somewhat older than those 

 found at Ipswich. 



Family ELATERID^(?). 

 Genus Elateridium, nom.nov. 

 Elaterites Tillyard, Mesozoic and Tertiary Insects of Queens- 

 land and New South Wales, 1916, p.41. 



Genotype, E. wianamattense Tillyard, from St. Peter's, 

 near Sydney. 



I propose this name for my genus, the name Elaterites being 

 preoccupied by a genus of Upper Miocene elytra fron Oeningen, 

 Switzerland. The type of this latter genus is E. lavatei'i Heer. 



Elateridium angustius, n.sp. (Text-fig. 13). 

 An almost complete spe- 

 cimen of a long, narrow 

 elytron, closely resembling 

 the type-species, E. wiana- 

 mattense, but differing . . Text-fig. 13. 

 ,. • • -^ ^ Elateridium anfiu><tins,n.sTD.,Q\ytYor\(\ensX^\ 

 irom It in its greater nar- . v >,, , m • • 



° 4 mm.). Glenlee; Inassic. 



rowness in comparison with 



its length, l^otal lenyth, 9 mm.; greatest breadth, 2 mm., not far 



