36 REMARKS ON THE UNMAN GENERA 



treille with Lethrus. Latreille indeed takes notice of an 

 " organization particular e*" in Lethrus, which separates 

 it from Geotrupes, but does not remark that this same pe- 

 culiarity of construction unites it to Lamprima, though 

 probably on this very ground Professor Pallas b and others 

 had already made it a Lucanus. I shall not, however, 

 depend solely on the opinions of systematic writers to prove 

 the connexion between Lethrus and Lamprima, but resort 

 to observations already recorded. The following charac- 

 ters are extracted from Latreille's Genera Crustaceorum 

 et Insectorum, and are common to both genera. 



1. Antenna articulis ultimis clavam iufundibuliformem 

 formantibus, articulo basilari elongato, conico. This 



character belongs to Geotrupes. 



2. Mandibula validissima cornea porrect a. This character 

 is common to Geotrupes and Lucanus. 



3. Maxilla in Lamprima filiformes setosa. Maxilla, in 

 Lethris processu terminali pilis spinulisque corneis, elon- 

 gatis ciliato. 



It will I hope be allowed that nothing can more satis- 

 factorily show the affinity existing between the Lucanida 

 and Lethrus, than this last remarkable analogy in the con- 

 struction of the maxillas. I shall therefore now consider 

 it as in a manner proved, that we are to pass from the 

 Dynastida to the Lucanida by means of Sinodendron, 

 and from the Geotrupida to the Lamprimida by means of 

 Lethrus. I have but one more remark to make on the 

 Thalerophagous Recticera ; which is, that the consideration 



a Hist. Nat. des Crust, et des Ins. vol. x. p. 159. 



b " Lucanus apterus.— Insectum anomalum inter Lucanos et Scaral&os 

 coprldeos ambiguum." Icones Insect. Pallas. 1. — Nov. Cum.Petrop. Laxman 

 torn, xiv. p. 594. 



