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 upon Machidius, 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 Machidius Mr. West- 

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

 ing new species. 



MaBchidius Hopianus, W. M . oblongus, scaler, nigricans, opacus, 

 setulis luteis (prasertim thorace) subcinereus ; prothoracis an- 

 giitis posticis valde emarginatis. Long. corp. lin. h\. [Hab. 

 New Holland ? Mus. Hope. 

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

 vix emarginato, prothoracis lateribus rotundatis, angulis posticis 

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

 lin. 4J. [Hab. New Holland. Mus. Melly. 

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

 gius setosus, elytris oblong o-ovatis depressis, thorace lateribus 

 rotundatis, angulis posticis acutis, tibiis anticis acute S-dentatis. 

 Long. corp. lin. 5. [Hab. 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. 44. [Hab. Port Philip, Australia. Mus. Raddon. 

 Msechidius rufus, (Hope MSS.). Rufo-castaneus, 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. 

 2J. [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, gracilibus, serrulatis. Clypeus 

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

 Mentum lateribus angulatis, antice profunde et acute emarginatum. 

 Antenna 10-articulata. 

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

 setosus, capite et prothorace circulis concentricis confluentibus , 

 sculpturatis, elytris striis numerosis tenue impressis, singulo tuber- 

 culis triplici serie ordinatis. Long. corp. lin. 3J. [Hab. South 

 America. D. Miers. 

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

 pus supra planum, rugosum, setosum, antice angustius, prothorace 

 in medio longitudinaliter impresso ; postice latiori. Caput sub- 

 ovale. Labrum exsertum, transver sum, pariim emarginatum. Mandi- 

 bula porrecta, apice curvata, acuta. Maxilla elongata, lobo apicali 

 longo, setoso. Mentum oblongum, lateribus pariim rotundatis, mar- 

 gine antico fere recto. Pedes longiusculi, serrati. Antenna 10- 

 articulata. 



