320 The Insect Fauna of Van Biemen's Land. 



Of the group of Trogidce,!. have to mention a most remark- 

 able and rare insect/t \si\iQScarahceii,sprohoscideus^chx\Q\i. {*) 

 from which MacLeay form.ed the genus Elephastomus (f). 

 Doubtless modifications occur in the length of the horn and 

 the snout shaped prolongation of head-plate, not in this 

 male only, but in all Lamellicorn males^ according to 

 the size and form of the individual ; these being dependent 

 on the amount of nourishment received by the larvse ; the 

 insectj, therefore, which was described by MacLeay (J) as a 

 female, having a blunter horn, a shorter snout, and a 

 slightly marked vertical appendage (fortsatz) must be a 

 less perfectly formed male : the real female is a true 

 jBolbocerus,\YL. — B.Australasice Kirby(§),with the exception 

 of the sexual distinctions, it agrees accurately with 

 Mejahastomus proboscideus, and, like this, is to be found in 

 our collection. It follows, therefore, that Wepliastonms 

 must not be regarded as a distinct genus, but as an erratic 

 form of Bolbocerus, in which the irregular formation of the 

 mouth parts, especially the elongation of the palpi, depends 

 on the particular position of the mouth : and this again on 

 those parts which protect the head. 



The widely distributed genus Trox, is represented in 

 Van Diemen's Land by Trox Australasia, Latr. 



The collection contains two species of the family Bpias- 

 tidcB, both of which belong to forms peculiar to New 

 Holland : one is a new species of the genus CUeiroplatys 

 Kirby (||) ; the second forms a distinct genus, — Pimelojms. 



distinctly different from our own. To this genus belongs also without a doubt Byrrlia 

 Australis Dej., which however is too imperfectly described by Boisduval (Faun, de 

 I'Ocean, p. 149) to be recognised as a third species. 



(*) Transact, of the Linn. Soc. vi., p. 189. 



(+) Horae. Entom. I., p. 121.— Griffith's Animal Kingdom, xiVc, pi. 40, f. 4. 



(X) Ibid, p. 122. 



(?) Trans. Lin. Soc, XIL, 462, 11, T. 23, f. 5. 



(11) Hope, Coleopterist's Manual, 1., p. 84. Besides Geotr. truncahis, (considered to 



