BY W. MACLEAY, ESQ., F.L.S. 335 



This insect was taken last summer at Piper's Flats, on the 

 western side of the Blue Mountains. It is of a stout convex 

 form, and differs from P. hrunnicornis not only in this respect, 

 but in being smaller, and in having the median line of the thorax 

 and the strias of the elytra more distinctly marked. 



Adotela nigerrima. 

 Long. 7 lin. 



Convexa nigra laevis nitidissima, thorace subquadrato canalicu- 

 lato ad latera rotundato postice subangustato, elytris ovatis 

 apice subacuminatis subrugosis lateribus postice quadri- 

 punctatis vix sulcatis, tibiis anticis gracilibus, antennarum 

 articulis sex ultimis pubescentibus. 

 My only specimen of this insect is a female, and, consequently, 

 the remarkable form of the palpi and tarsi does not appear, but I 

 have no doubt of its belonging to this genus. 

 It is from the Percy Islands. 



Among a number of new and very interesting Coleoptera 

 brought by Mr. Darnel from Cape York some years ago, was an 

 unique specimen of a very remarkable and gigantic Carabideous 

 insect. It has in general appearance a considerable resemblance 

 to an insect found in the deserts of the Caspian, Dioctes Lehmanni 

 Menetries, about the aJ0S.nities of which entomologists have widely 

 disagreed. 



Baron de Chaudoir believes its affinity to be with Acinopus, 

 while Lacordaire places it among the Cnemacantlddce. 



The difficulty felt in the case of the genus Dioctes will, I sus- 

 pect, extend to the present insect, though, beyond the general re- 

 semblance, there is not much in common in the two insects. 



The following are the characters, as nearly as I can give them 

 from the rather mutilated specimen in my possession, of this 

 genus which I propose to name 



Mectnognathus. 

 Mentum magnum profunde emarginatum dente medio brevi 

 lato bifido lobis lateralibus rotundatis intus verticalibus. 



V 



