Entomological Society. 457 



field offered an instance), thereby bringing into question the cor- 

 rectness of the generally received views of the superposition of the 

 different geological formations. 



A memoir was read ujion Mcechidius, MacL., a genus of Lamelli- 

 corn beetles, with descriptions and figures of some new genera be- 

 longing to the same tribe, by J. O. Westwood, F.L.S. 



From a review of the characters of the genus Mcechidius Mr. West- 

 wood refers it to the family Melolonthida, and describes the follow- 

 ing new species. 



Msechidius Hopianus, W. M. oblongus, scaber, nigricans, opacus, 

 setulis luteis {prcesertim thorace) subcinereus; prothoracis an- 

 gulis posticis valde emarginatis. Long. corp. lin. 5^. [Hab. 

 New Holland ? Mus. Hope. 



Msechidius Mellianus, W. M. augustior nigricans, capite antice 

 vix emarginato, prothoracis lateribus rotundatis, angulis posticis 

 ejctus prominentibus, tibiis anticis obtuse tridentatis . Long. corp. 

 lin. 4^. [i/ff6.. New Holland. Mus. Melly. 



Msechidius Macleaynus, W. M. piceus, nitidus, punctatus, lon- 

 gius setosus, elytris oblongo-ovatis dcpressis, thorace lateribus 

 rotundatis, angulis posticis acutis, tibiis anticis acute 'd-dentatis. 

 Long. corp. lin. 5. [Hub. New Holland. Mus. Westwood. 



Msechidius Raddonianus, W. M. piceus, punctatus, brevissime 

 setosus, capitis margine antico profunde et acute emarginato, tho- 

 racis lateribus rotundatis, angulis posticis acutis. Long. corp. 

 lin. 4|. \_Hab. Port Philip, Australia. Mus. Raddon. 



Msechidius rufus, (Hope MSS.). Rufo-custaneus, nitidus, puncta- 

 tus, tenue setosus, capite lato, marginibus elevatis, tibiis anticis ob- 

 tuse bidentatis, femoribus posticis in medio dilatatis articuloque 

 basali tarsorum posticorum longe penicillato. Long, corp, lin. 

 2|. \_Hab. Port Essington, Australasia. Mus. Hope. 



Cryptogenius, W. (Gen. nov. ad fam. Trogidarum pertinens.) 

 Corpus supra planum, rugosum, setosum, prothorace subrotundato, 

 elytris angustiori, pedibus longis, gracilihus, serrulatis. Clypeus 

 inferus. Labrum maximum, os (insecto quiescenti) omnino obtegens. 

 Mentum lateribus angulatis, antice profunde et acute emarginatum. 

 Antennce lO-articulatce. 



Cryptogenius Miersianus, W. Cr. nigricans, subnitidus, luteo- 

 setosus, capite et prothorace circulis concentricis confiuentibus, 

 sculpturatis, elytris striis numerosis tenue impressis, singula tubcr- 

 culis triplici serie ordinatis. Long. corp. lin. 3^. \_Hab. South 

 America. D. Miers. 



Anaides, W. (Gen. nov. ad fam. Trogidarum pertinens.) Cor- 

 pus supri'i planum, rugosum, setosum, antice angustius, prothorace 

 in medio longitudinaliler imprcsso ; postice lutiori. Caput sub- 

 ovale. Labrumexsertum, transversum, parum emarginatum. Mandi- 

 bulceporrectcc, apice curvatcc, acuta. Maxilla: elongatce, lobo apicali 

 lojigo, setoso. Mentum oblongum, lateribus parum rotundatis, mar- 

 gine antico fere recto. Pedes longiusculi, serrati. Antenna \Q- 

 articulata. 



