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Family. DYNASTID^, MacLeay. 

 Genus. Megaceras, Kirby. 



Type of the Genus. Geotrupes Chorinjeus, Fab. 



Caput in mare unicorne, cornu simplici, apice 

 bifido, antice convexo, postice canaliculate 



Mandibulce validae apice bilobse, basi dilatatse 

 intus subciliatse. 



Maxilla ungulates, interne inermes. 



Palpi maxillares 4-articulati articulo l mo brevi, 

 2 d0 longiori suboblongo, 3 ti0 obconico, extimo elon- 

 gato-ovato subtruncato. 



Mentum* subtrigonum apice truncato basi paullo 

 angustiori. 



Labium obsoletum vel internum. 



Palpi labiates 3-articulati articulis duobus primis 

 obconicis, ultimo longiori apice attenuato. 



Antennce 10-articulatse, articulo l m0 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. 



