520 MISCELLANEA ENTOMOLOGICA, NO. IV, 



posterior tibiae. Metasternum long. Mesosternum horizontal an(J 

 narrowed behind, declivous and semicircularly concave in front. 

 The prosternal prominence flat, two-grooved, lanciforni and 

 declivous behind. Body oval or oblong, winged. 



This genus is numerous in species, and seems to be pretty 

 evenly distributed throughout Australia. They are flat insects, of 

 pitchy or black colour, and are, I believe, invariably found under 

 the loose bark of living Gum trees. 



The species are not easily identified, and the difficulty 

 is much increased by the doubt which exists as to the 

 identity of some of the old typical insects described by Boisduval 

 and De Breme. I find that in the Australian collections to 

 which I have had access, the wrong names have been in many 

 cases affixed to the wrong insects. The reason, no doubt, is that 

 there are few entomologists here who have seen the Marquis De 

 Breme's Monograph, and fewer still who can get access to Bois- 

 duval's "Faune del'Oceanie." I cannot say, however, that I regard 

 the inaccessibility of Boisduval's work as a misfortune, for a worse 

 describer of Coleoptera I never met with. Under the genus 

 Gilibe he gives descriptions of nine species of this group, none of 

 which are recognizable from his descriptions. 



I propose to divide the insects of this genus into two sections, 

 founded on marked differences in form. 1st., Those of broadly 

 ovate form, and broad expanded margins in both thorax and 

 elytra. 2nd., Those of more elongate form, and with the margins 

 of the elytra less broad, or narrow. 



The second of these sections is much the most numerous in 

 species, and I propose to simplify the identification of them by 

 further sub-divisions founded on the sculpture of the elytra — 



1. Elytra seriate-punctate, the interstices costate. 



2. Elytra seriate-punctate, the interstices granulose. 



3. Elytra seriate-punctate, the interstices plain or slightly 

 convex. 



4. Elytra irregularly punctate. 



