BY R. J. TILLYARD. 417 



Tims, at the present time, the family Ithonidm contains four 

 described species, allotted to three genera. Most fortunately for 

 future studies, the types of three of these species are located in 

 the British Museum. 



When I wrote my previous paper on this famiM9), my collec- 

 tion contained only the two males of /. fulva from Stradbroke 

 Island, together with two specimens of a much larger and darker 

 species, taken at light at Hornsby, N.S.W. One of these latter 

 insects had been sent to Mr. P. Esben Petersen, the well-known 

 Neuropterist, of Silkeborg, Denmark, and had been determined 

 by him as belonging to I.fusca Newman. It was on this deter- 

 mination that I figured the male appendages of this species (9, 

 PI. xii., figs.7-9) for comparison with those of I. fulva. 



From 1916 onwards, I was most anxious to discover the larva 

 of Ithone. For this purpose, I showed my insects to Mr. Luke 

 Gal lard, to whom the family was at that time unknown, and told 

 him of my experiences with them on Stradbroke Island. He 

 became very interested in them, and promised to keep a sharp 

 look-out for further specimens. In October, 1917, while he and 

 his family were staying in a cottage near the Ocean Beach, Woy 

 Woy, Mrs. Gallard discovered, about 6 o'clock one evening, a 

 specimen of Ithone sitting on a post. This led to further finds, 

 and Mr. Gallard returned at the end of a week with about two 

 dozen specimens, most of which had been found hiding in an old 

 outhouse near the cottage. Last year I spent a week with Mr. 

 Gallard in the same cottage, at the beginning of November, with 

 the result that we not only obtained about two hundred of the 

 imagines, but also discovered the larva and pupa, and obtained 

 many hundreds of fertile eggs. The full account of these inter- 

 esting discoveries will be given in a later paper. 



Now the extraordinary thing was that this abundant species, 

 which agreed well enough with Newman's description of /. fusca, 

 was most certainly not the same species as the one I already had 

 in my collection, and which Petersen had already determined as 

 the true /. fusca. It was not even congeneric with it; for the 

 Woy Woy species has constantly only a single radial sector in 



