BY R. .T. TILLYARD. 



419 



" Iii addiiioii to Newman's type, the B.M. has two other males 

 of Ithone fusca, while a female of the large species is registered 

 thus, under the year 1845: — 'Australia (Harrington); purch. of 

 Argent.' 



"As to your ///tour pallida (this was the MS. name under 

 which I sent the Tasmanian species to Mr. Campion — R.J.T.), 1 

 do not see how it can have very much to do either with Varum 

 perloides or with Nespra implexa. For one thing, the wings are 

 unspotted, instead of being marked with blotches along the veins. 

 For another thing, the costal veinlets in the forewing are for the 

 most part simple and regular, whereas in V. perloides they are 

 either forked anteriorly or anastomosed and irregular. In A. 

 implexa the costal space is filled with an intricate meshwork of 

 little veins, recalling the condition prevailing in the elytra of 

 Acridiid Orthoptera. 



"I do not know how Navas distinguishes Nespra from Varnia, 

 as he compares his genus with Ithone alone. There is a good 

 deal of resemblance between the two types, although there is a 

 great disparity in size, and V. perloides is more heavily spotted, 

 especially on the hindwings. But of course I am comparing a 

 single male with a single female, and I do not know enough of 

 the group to say how far sexual differences extend, neither can 



I tell what, if any, colour-changes take place during life 



I cannot understand why Walker's genus Vamia should have 

 been allowed to lapse, and its contents transferred to Ithone, for 

 it seems to me that species having two Rs in the forewing must 

 be generically distinct from forms possessing only one Rs." 



Thanks, then, to Mr. Campion's careful comparison of the 

 species in the British Museum with those in my own collection, 

 it is now possible to make the following assertions : — 



(1) The species determined by Petersen from my own collec- 

 tion, and by Navas in the British Museum Collection, as being 

 tthonefu8ca Newin., is not that species, but a species that so far 

 has no distinctive name. 



(2) The true Ithone fusca Newm., is the same species that is so 

 common at Wby Woy, and possesses only one Rs in forewings. 



