416 STUDIES IN AUSTRALIAN ENTOMOLOGY, 



n. Ventral segments transversely suicate. 

 k. Elytra striate on disc, smooth towards sides, rounded 

 at humeral angles Darodilia. 



kk. Elytra striate on sides, as well as on disc, dentate at 

 humeral angles. 



I. Head large, not transversely impressed across vertex 



Gyphosoma. 



II. Head small, transversely impressed across vertex (penulti- 

 mate joint of maxillary palpi much shorter than last) Setalis* 



In addition to the genera noted above, the following, belonging 

 to the Pterostichus group of genera, have been omitted, viz., 

 Abacetus, Eurystomis and Nelidus ; Abacetus, because, having 

 only a specimen of one species, I feel unable to deal with it ; 

 Eurystomis and Nelidus because they are unknown to me in 

 nature. 



The table above merely indicates what appear to me the most 

 obvious points of distinction between the genera mentioned. 

 Baron de Chaudoir, the author of nearly all these genera, though 

 he bestowed names upon them, regarded them merely as suV^- 

 genera (or sub-divisions) of the central genus Feronia, and 

 apparentl}^ for that reason multiplied them in what seems a ver}- 

 random way ; unfortunately he never tabulated his genera and 

 sub-genera, and has thus thrown upon those who have followed 

 him the task of determining the relative value of his divisions. 

 In the present classification I have merged in Pterostichus the 

 sub-genera Notonomus, Sarticus, Rhabdotus and Coronocanthus, 

 l)ecause it has seemed impossible to maintain them satisfactorily 



* Setalis nir/er, Ca,steln. = Loxogrmi.'< ohscuru-'^, SI. The species Sir 

 William Macleay calls S. nii/cr, Cast., in his paper on "The insects of 

 Gayndah" (Trans. Ent. Soo.'N.S.W. 1S73, Vol. II.), is a species of Hot- 

 mochilua, as I have recently found by seeing the specimens in the Austra- 

 lian Museum, from Gayndah, so named by him. I have seen a number of 

 specimens in the Howitt Collection at the Melbourne University, labelled 

 " Setalis niger, Casteln.," and they are identical with the species on which 

 I founded the genus LoxoipmiK. It may be noted that I have said there is 

 but one lateral basal impression on each side of the pi'othorax, while 

 de Castelnau has said there are two ; however, the external one is feebly 

 developed, and was obsolete in my unique specimen. 



