82 



Family. DYNASTIU^, MacLeay. 

 Genus. Megaceras, Kirby. 



Type of the Genus. Geotrupes Chorin^eus, Fab. 



Caput in mare imicorne, cornu simplici, apice 

 bifido, antice convexo, postice canaliculate. 



MandibulcB validse apice bilobse, basi dilatatse 

 intus subciliatse. 



Maxillce ungulatse, interne inermes. 



Palpi maxillares 4-articulati articulo 1"'" brevi, 

 2'"" longiori suboblongo, 3''° obconico, extimo elon- 

 gato-ovato subtruncato. 



Mentmn* subtrigonum apice truncate basi paullo 

 angustiori. 



Labium obsoletum vel internum. 



Palpi labiales 3-articulati articulis duobus primis 

 obconicis, ultimo longiori apice attenuate. 



Antennce lO-articulatse, articulo l""'basi angusto, 

 apice crassiori, sequentibus sex fere moniliformibus, 

 clava subovata trilamellata. 



Corpus oblongum. 



Thorax postice abdominis latitudine, e basi antice 



* Labium, Kirby, in Linnean Transactions. 



