592 DESCRIPTIONS OP AUSTRALIAN MICRO-LEPIDOPTERA, 



Posterior tibiae rough-haired. Forewings with vein 1 furcate, 7 

 to costa, 7 and 8 sometimes stalked, 11 from before middle. 

 Hind wings 1, elongate-ovate, cilia 1 ; vein 4 absent. 



Probably endemic ; it is nearly related to Thereutis, of which it 

 may be regarded as a development. 



1. Forewings with dark dorsal streak ... 171. isorista. 

 Forewings without dark dorsal streak .. 2, 



2. Forewings with dark median streak ... 172. orthotricha. 

 Forewings without dark median streak ... 173. candescens. 



171. JVe^n. isorista, n.sp. 



(J. 13-14 mm. Head white^ face fuscous-tinged. Palpi fuscous, 

 internally white. Antennae dark fuscous, base white. Thorax 

 white, with a central light fuscous stripe. Abdomen grey-whitish. 

 Legs dark fuscous, posterior pair whitish. Forewings elongate, 

 rather narrow, costa moderately arched, apex acute, hindmargin 

 slightly sinuate, extremely oblique; snow-white; markings fuscous 

 mixed with dark fuscous ; a moderate streak along costa from 

 near base to near apex, attenuated at extremities ; a moderate 

 streak along inner margin from near base to hindmargin above 

 anal angle, extremities attenuated : cilia grey, paler towards tips, 

 round apex suffused with white. Hindwings grey; cilia ochreous- 

 whitish. 



York, West Australia ; in November, three specimens. 



172. JVem. orthot7-icha, n.sp. 



^2- 14-17 mm. Head white. Palpi fuscous, internally white. 

 Antennae fuscous, base white. Thorax white, patagia with a 

 fuscous central stripe. Abdomen whitish. Legs fuscous, posterior 

 pair whitish. Forewings elongate, rather narrow, costa mode- 

 rately arched, apex acute, .somewhat produced, hindmargin slightly 

 sinuate, extremely oblique ; snow-white ; two fuscous longitudinal 

 streaks, mixed with dark fuscous on discal side ; first along costa 

 from near base to near apex, attenuated towards base ; second 

 below middle from base to apex : cilia whitish-fuscous, more 



