Sawjlies from the Australian Region. 435 



Subfamilies of Argidse. 



Anal vein complete and separate for its entire length ; 

 first and second anal cells separated by an oblique 

 interanal vein ; anella and recurrentella wanting-. Zenaryina. 



Anal vein either partly or entirely wanting ; first anal 

 cell wanting or small and separated from the 

 second by the submedian vein; anella and re- 

 currentella present 1. 



1. Intercosta present Aryince. 



Intercosta wanting Sterictiphorince. 



The Argids, largely because of their three-jointed an- 

 tennae, have long been considered as a distinct group, but 

 most classifications have failed to show any relationship 

 be (ween them and such groups as the Perreyiidae, Loboceridje, 

 or Pterygophoridae. A study of these four families shows, 

 however, that they have much in common, and it is not 

 unlikely that they had a common origin and are phylo- 

 genetically closely allied. The subfamily Zenarginae adds 

 some evidence to this assumption, because it has certain 

 characters which suggest an affinity with the Perreyiidae and 

 certain others which suggest Loboceridae. The venation in 

 the Zenarginae is different from all other saw flies. The 

 anterior wing probably represents a generalized Argid, 

 because, with the exception of the complete anal vein, it 

 presents nothing remarkable. The apex of the radial cell 

 and the form oi the radial and cubital cells, especially at the 

 base, however, suggest Loboceras. The hind wing is much 

 more specialized than the hind wing of the Argids, because 

 of the loss of anella and recurrentella, and is not unlike 

 Ptrreyia. The shape and foveolation of the head is not 

 typical of the Argids, but recalls more the head of some of 

 the Perreyiidae. 



In MacGillivray's classification the genus Zenarge runs to 

 the subfamily Lophyrinae, but it has but little in common 

 with this group, and dots not even resemble it closely in 

 venation. 



Zenarge, gen. nov. 



Genotype. Zenarge turneri, Pohwer. 



Clypeus long, the dorsad-ventrad length nearly half as 

 great as the apical width, the anterior margin rounded 

 laterally and emarginate medianly, the dorsal margin com- 

 posed of three sections, the lateral sections half the length of 

 the median section, the entire dorsal margin sharply defined ; 



