418 STUDIES IN AUSTRALIAN NEUROPTERA, viii., 



the forewing, whereas the Hornsby species, like /. fu/va, has 

 either two or three separate radial sectors in the forewing. The 

 appendages of the males are also quite different, those of the 

 Woy Woy species being of normal size and of simple forcipate 

 shape like those of I. fidva, whereas those of the Hornsby species 

 are immense claspers of a very specialised broad shape. Re- 

 ferring to Newman's description of /. fusca, in order to solve 

 this problem, I was disappointed to find that he makes mention 

 neither of the condition of Us in the forewing, nor of the form 

 of the appendages, although his type specimen was a male. 



Thus it was impossible, on the evidence at hand, to determine 

 whether the Woy Woy or the Hornsby species was the true /. 

 fusca of Newman. There was only one method of solving the 

 problem, viz., to have specimens of both insects compared with 

 Newman's type in the British Museum. With this purpose, I 

 wrote to my friend Mr. Herbert Campion, and sent him one of 

 my Hornsby specimens, together with a series of the Woy Woy 

 insects, and a specimen of a very distinct paler species from 

 Tasmania, and Victoria. His reply to my request has now 

 reached me, and definitely clears up all doubts, not only about 

 the identity of /. fusca, but also about the other species repre- 

 sented in the British Museum. For this help, without which a 

 revision of this family could not possibly have been attempted, 

 I now desire to offer him my most cordial thanks. He writes as 

 follows : — 



" I think there can be no doubt that two remarkably similar, 

 but nevertheless distinct, species have been going under the 

 name of Ithone fusca. Newman's species is represented in your 

 collection by the specimens from Woy Woy, while the other 

 (which, so far as I am aware, stands without a name) is repre- 

 sented by the insect from Hornsby. I distinguish the two 

 insects thus: — 



Larger species; 2 Rs in forewing; anal appendages of 6 expanded 



dorso-ventrally, excavated at apex Gen. et sp. incert. 



Smaller species; 1 Rs in forewing; anal appendages of 6 not ex- 

 panded dorso-ventrally, pointed at apex Ithone fusca Newm. 



