Lamellicorn Beetles. tea 
Acanthocerus ; the first of which has a Geotrupideous and the 
second a Trogideous clava to its antenne, the first also has 
Geotrupideous and the latter rather Trogideous maxille and 
Jabium. 
The Trogides consist, according to Latreille, of the genus Trox 
alone, with Phoberus as a subdivision.* 
The genus Orphnus, which MacLeay places in the family Geo- 
trupide, is introduced by Latreille into the Dynastide, and is 
stated not to differ from Oryctes. This relationship will be ex- 
amined in a subsequent part of this paper. 
With these preliminary remarks on the relationship of these 
insects, I now proceed to the description of the various genera 
which possess 10-jointed antennee, and which respectively belong 
to the families Geotrupide or Trogide as thus characterized. 
GEOTRUPIDE. TroGip#. 
Antennarum clava..articulo basali infundibuliformi ..—— articulis liberis. 
Mavillarum lobis ..membranaceis ....+.0-+eee06 potius corneis, supero 
ciliato-dentato. 
Labii lobis......+..plerumque porrectis ........+.+-——= plerumque retractis. 
GrorTRUPIDA. 
Antennarum clava articulo basali infundibuliformi ; maxillarum lobi membranacei; 
labium lobis plerumque porrectis. 
Antenne Ll-articulate ....-ccessescccccccvesvees os Ccotrupes, &c. 
Antenne 10-articulate. 
Prothorax integer. 
Tibiz antice 3-dentate. 
Mandibula uncinate ......+2secececeeeceee ee Hybosorus. 
Mandibule latiores. 
Ungues bifidi. 
Tibiz postice in medio inermes ......+--++++Silphodes. 
Tibiz postice in medio dentate ............Coilodes. 
Ungues simplices .. 0.5... c0ccceccccve cece oe ChEloduss 
Tibiz antic 2-dentate .....ccceecscvcceessece--Apalonychus. 
Prothorax canaliculatus .....2cscececcsscececece se Anaides. 
Trocipe. 
Antennarum clava articulis liberis; maxillarum lobi cornei, externo ciliato- 
dentato ; labium lobis plerumque retractis. 
Antenne 9-articulate. 
Corpus breve latum’. 0.20.26 cece cs cc cs ence wesc ve oe Hpialian 
Corpus longum parallelum.........-eeeeeeeeeeee ee Chiron. 
* Cryptodus and Mechidius are however mentioned in a note, not having been 
seen by Latreille; he however considers them as removed from Tox, and regards 
Mechidius as allied to Melolonthus. 
