BY E. MEYKICK, B.A. 175 



with, four simple attenuated longitudinal veins. Hind- wings 

 without cell ; median three-branched. 



Also a small genus, of which the larvae are all practically 

 unknown, occurring in Europe and North America. 



Op. orestias, n. sp. 

 ? , 3". Head, palpi, antennae, thorax, abdomen, and legs 

 snow-white. Fore-wings snow-white, with a small, bright 

 ochreous-yellow apical blotch ; an oblique dark fuscous streak 

 from costa at f , bent posteriorly, ending in apex ; a small clear 

 black apical dot in cilia ; three rather indistinct radiating fuscous 

 streaks above it in costal cilia, the middle one darkest ; cilia 

 white. Hind-wings very pale whitish-grey, cilia white. 



Distinguished by the yellow apex, and single costal streak. 

 One specimen near Brisbane in swampy bush, in September. 



Op. stiriella, n. sp. 



^ ? . 2j"-3". Head, palpi, thorax, abdomen, and legs snow- 

 white. Antennae ochreous with white rings, basal joint white. 

 Fore-wings snow-white ; costal edge slenderly blackish at base ; 

 a small wedge-shaped oblique dark fuscous spot on costa, and a 

 similar rather smaller one before middle of inner-margin, neither 

 extending across more than ^ of breadth of wing ; an oblique 

 ochreous-fuscous streak from f of costa, ending suffusedly in 

 apex; a minute black apical spot, with an inwardly oblique 

 fuscous streak above it in costal cilia, and sometimes a second 

 less oblique and very obscure, and one below it in hind-marginal 

 cilia ; cilia white. Hind- wings and cilia white. 



Nearly allied to the following species, but may be known by 

 the white hind- wings, and the oblique spots never form a complete 

 fascia. Tolerably common at Parramatta, and in parts of the 

 dense forest-growth on the slope of the Bulli Pass, in September 

 and October, and again in March. 



