426 STUDIES IN AUSTRALIAN ENTOMOLOGY, 



Genus Pterostichus. 



Though in the table given above I have felt compelled to 

 include the genera Notovomus, Sarticus, Coronocanthus, and 

 Rhahdotus in the central genus Pterostichus, yet, for Australian 

 workers the genera Notonomus and Sarticus are so convenient 

 that in all practical work they should be maintained ; their use 

 greatly simplifies the recognition of species, and except in very 

 rare cases no difficulty is experienced in referring species to the 

 right one of these genera.* 



Coronocanthus su/catus, MacL, = Sarticus quadrisulcatus, Chaud. 

 A comparison of a specimen of Coronocanthus su/catus, MacL, 

 with the description of Sarticiis qnaJristilcatus, Chaud., leaves no 

 doubt in my mind of their identity. Macleay's description was 

 published in the year 1877 ; Chaudoir's in 1878. It seems 

 probable the genus Coronocanthus should be recognised as 

 distinct from Sarticus, though, at present, I am not prepared 

 to separate it. 



Rhabdotus is founded for a Tasmanian group of species having 

 the labrum with a light linear longitudinal impression in the 

 middle ; I cannot satisfactorily differentiate it from Pterostichus. 

 The facies of the species of this group readily separate them 

 from Notonomus and Sarticus. 



Pterostichus blackburni, n.sp. 



$. Robust, elytra rather depressed on disc ; prothorax 

 transverse, widely margined ; elytra oval, strongly crenulate- 

 striate, the interstices depressed. 



Black. Head not large, smooth, convex ; frontal impressions 

 quite obsolete ; clypeal suture hardly impressed ; eyes prominent, 



» Notonomus and Sartims may be separated as follows : — 

 . Prothorax with a narrow basal impression on each side, the lateral 

 border narrow, not forming a wide border to the basal impres- 

 sions Notonomus. 



Prothorax with a broad foveiform basal impression on each side 



widely margined by the lateral border Sarticus. 



Perhaps, the more accurate course would be to regard the species now 

 attributed to Notonomus, which vary among themselves a good deal, as 

 belonging to Pterostichus, and to maintain the genus Sarticus which com- 

 prises a clearly defined group of species. 



