BY R. J. TILLYARD. 27'J 



The two known species of the genus may be separated as 

 follows : — 



Larger and darker species, expanse 50 mm. or more, colouration fus- 

 cous; antennw about half as long as forewing; appendages of 

 male enormous I. fiisca Newman. 



Smaller, less robust and paler species, expanse 45 nmi. , colouration 

 dull fulvous; antenna? two-thirds as long as forewing; ap- 

 pendages of male of moderate size /. fu/ra, n. sp. 



1. Ithone pusca Newman. (Plate xii., tigs. 7-9). 



Newman, loc. cii., p. 181. 



This species appears to be well known, and represented in a 

 number of collections, but I have not seen any good description 

 or figure of it published. Newman's description of it is very 

 short, but quite to the point : — " Fusca, setosa, subtus dilutior 

 et paullo flavescens, alae fuscescentes, venae longitudinales setis 

 tecta?, transversfe nisi supracostales nudse.'' The general appear- 

 ance is much like that of I./ulva, n.sp., as figured in Plate xii., 

 fig. 1, but the whole body is stouter, hairier, and darker, the 

 antennje shorter, thicker, and darker in colour, the wings 

 broader and much darker. The appendages of the male are very 

 remarkable, being in the form of an immense pair of forceps of 

 very peculiar shape; the dorsal, profile, and posterior views are 

 shown in Plate xii., figs. 7, 8, and 9 respectively. 



}Jab. — Sydney District, N.S.W., where it appears to be at 

 present very rare. I ha\e a male and female taken at light in 

 my house at Hornsby, but they are the only specimens that I 

 have seen in the course of many years collecting. I also have 

 some torn pieces of the wings of a specimen sent from Tasmania, 

 but almost completely destroyed in the post, which probably 

 belong to this species. It has also been recorded from Western 

 Australia, but I do not know whether this is really the same 

 species. 



2. Ithone fulva, n.sp. (Plate xii., figs. 1-6). 



^. Total length 17, abdomen 11-5, forewing 21, hindwing 18-5, 

 expanse 45 mm. 



Head : eyes button-like, shining black, wide apart; antenna' 

 14 mm., filiform, tapering, dull fulvous; epicranium brown, 

 clypeus brownish, yac^ and mouth-parts dull fulvous. 



