Rev. F. D. Morice's Notes on Australian Sawflies. 259 



IXDKX OF GENEE \ TABULATED. 

 (Imported genera in italics.) 



1. Ophrynopus . 



2. Sirex 



.'{. Xiphydria 



4. Zcnarge 



5. Trichorhacluis 



6. Antargkliuin 



7. Perga 



S. Xyloperga . 



9. Phylacteophaga 



10. (Vrealces 



Sec 



pages. 

 . . 251 

 . . 253 

 . . 25:$ 

 . . 254 



254, 259 

 . . 254 



255, 265 

 255. 265 

 . . 255 

 255. 287 



I I . Philomastix 



12. Pergula 



13. Pterygophorus 



14. Caliroa . 



15. Polyclomis 



16. Diphamorphos 



17. Eurys . . 



18. Neoeurys . 



19. Clarissa 



panes. 



256, 2S7 

 256, 288 



256, 289 



. . 257 

 . . 257 



257. 294 

 257, 294 

 25S, 297 



25S. 2!l«) 



TRICHORHACHUS, W. F. KIRBY. 

 SYNOPSIS OP THE SPECIES. 



All Trichorhachus species, except nitidus of which B.M. 

 possesses one <$ and one $, were described from single ,' 

 specimens, and any tabulation of their characters based 

 on such inadequate material can only be quite pro visional, 

 since it is impossible to be certain which of these characters 

 are really specific and constant, and which liable to varia- 

 tion or even merely individual. The Type of one (australis, 

 Westw., described as a Schizocera) is at Oxford, all the others 

 are in B.M., and all this material, such as it is, I have 

 examined and compared with the original descriptions. 

 But I have seen no other representatives of the genus, 

 nor — so far as I know — has any one else ! 



Konow's treatment of Trichorhachus in his Genera 

 Insectorum illustrates the danger of speculating on the 

 affinities of a genus without having see n any represental ive 

 of it. (Tt is only fair to say thai in this case he expressly 

 acknowledges himself unacquainted with the insects 

 otherwise than in literature ; but there are cases in which 

 he has unfortunately been less explicit.) He begins by 

 placing it in his division " Argides," which he separates 

 from his " Schizocerides" as having an intercostal nerve 

 in the fore-wing. But in fact such a nerve is not present 

 in any specimen of Trichorhachus. Yet neither can it 

 belong to the Schizooerides as defined by Konow. since its 



