(2W 



BY R. .T. TILLYARD. 423 



imago stout-bodied and moth-like in appearance, with large 

 mandibles and generalised Prohemerobiid type of wing-venation. 



Key to the Genera of Ithonidce. 



fForewing with only a single radial sector Itiione, Newm. 



( 1 ) -! . ' 



| Fore win",' with two or more apparent radial sectors "2. 



'Wings unicolorous; the costal veinlets of the fore- 

 wing with little or no tendency to branching, 

 and with few or no cross-veinlets connecting 



them. Eastern Australia only Heterithone, n.g. 



(Type. Rhone fidva Till.). 

 Wings with the veins marked with black or fus- 

 cous; the costal veinlets of the forewing fre- 

 quently branched, and frequently connected 

 together by cross-veinlets. Western and Cen- 

 tral Australia only Varnia Walk. 



Genus Ithone Newm. (Text-figs. la, b, 2, 3, 5,6). 



Newman, Ent. Mag., 1838, v., p. 181; Zool., 1853, xi., Ap- 

 pendix, Ait. xxix., p. cci. 



Characters as for the family, with the addition that the fore 

 wing lias only a single radial sector. 



G e n o t v p e, Ithone fusea Newm. 



Habitat.: Sandy places along the coastline of New South 

 Wales. 



The genus, as now restricted, contains only the type-species, 

 which appears to be abundant enough, if looked for at the right 

 season and in the right places. 



Ithone fusca Newm. (Text-figs. la, b, 2, 3, 5, 6). 



Newman, Ent. Mag., 1838, v., p. 181. 



As Newman's description is far too general, and does not dis- 

 tinguish the species definitely from its near neighbours, it is 

 redescribed here, with special attention to the anal appendages, 

 which are of great value in the determination of the various 

 species. 



g. Total length (dried), L 6-20 mm. ; abdomen (dried), 10-14mm.; 

 forewing, 19 24 mm.; hindwing, 17-22 mm.; expanse, 40-52 mm. 



