COLEOPTERA. PETALOCERA. 191 



over, they have not been adopted by subsequent authors, Latrcille 

 dividing the section into subdivisions, having the genera Lucanus and 

 Passalus as their respective types, the latter having the antennae 

 scarcely elbowed {fig. 18. is.), and the maxillaj corneous and toothed, 

 as well as the labium (^fig. 18. 14.). There are but four British species 

 belonging to as many genera, all of which enter into MacLeay's 

 family Lucanidae. 



Amongst the exotic genera, the beautiful Australian genus Lam- 

 prima, is distinguished by its splendid metallic colouring, the re- 

 markable porrected and villose mandibles, and the large plate which 

 arms the extremity of the anterior tibiae of the males. Pholidotus is 

 also metallic, but the body is clothed with pale buff scales, and the 

 mandibles are very long ; but the most remarkable genus in this 

 respect is Chiasognathus (Steph. in Trans. Phil. Soc, Camhr^ \\\ 

 which these organs are longer than the body, rather slender, bent 

 down towards the tip where they are suddenly reflexed ; they are 

 also furnished on the under side at the base with a long horn ; the 

 colours of this genus are exceedingly splendid and metallic. The 

 only species Ch. Grantii inhabits the Island of Chiloe on the Western 

 Coast of Colombia. The female, which has been shown to me by M. 

 Audouin, is very different, having very short mandibles. Another 

 genus Trictenotoma ( G. R. Gray) is not less interesting, having 

 the antennoB nearly as long as the body and not elbowed, with the 

 three terminal joints but very slightly produced on the inside and the 

 tarsi heteromerous. This insect, which I first noticed in the Zool. 

 Joicrn., Nos. 18 and 19., and figured in Griffiths An. Kingd. Ins. t. v., 

 is of very difficult location, appearing, liowever, to connect the Lu- 

 canidse and Longicorn beetles. It is from Java and the East Indies. 

 This is the Rafflesian insect alluded to by Mr. Kirby in his Fauna 

 JBoreali Americana, p. 166., as forming this jiassage. 



ThePETALocERA* of Dumcril (ScarabaDUsZmw<se/5), or second divi- 

 sion of Lamellicorn insects, is a group of very great extent, distinguished 



* BiBLiocR. References to the Petalocera in general. 



MacLeay. Hora? Ent. 8vo. pt. 1. 1819, pt. 2. 1821 Ditto, Edit. Lequicn. 



Paris, 1834. 

 Kirhy, in Trans. Linn. Soc. Lond. vols. xii. and xiv. ; and in Zool. Journ. No. 10. 



