BY E. MEYRICK, B.A. 375 



hindmargin very obliquely rounded \ light fuscous-grey, irregularly 

 mixed with whitish, and with scattered blackish scales ; a fuscous 

 basal patch, its outer edge inwardly oblique, from \ of costa 

 to 5 of inner margin ; a triangular fuscous patch on costa somewhat 

 before middle, reaching \ across wing ; a blackish dot in disc at \, 

 a second on fold slightly beyond first, a third on apex of costal 

 triangle, and three others transversely placed and generally 

 united into a crescentic mark in disc beyond middle ; an irregular 

 interrupted blackish-grey transverse line from f of costa to before 

 anal angle, indented inwards beneath costa, angulated in disc, and 

 somewhat bent above anal angle ; a row of dark fuscous dots on 

 hindmargin : cilia whitish, with two interrupted fuscous-grey lines. 

 Hindwings pale grey or whitish-grey, rather darker posteriorly ; 

 cilia whitish-grey, with a darker line. 



The largest species of the genus, and the only one in which the 

 f orewings are at all dilated ; differs from all but the next species in 

 the form of the basal patch, which is broadest above ; from 

 N. mathematical, it is separated by the much cloudier appearance 

 and lighter markings, and by the greyish head. 



Blackheath (3,500 feet), New South Wales, in October; 

 common. 



167. Neph. mathematica, n. sp. 



Media, alis ant. griseis, cano-mixtis, nigro-sparsis, macula ad 

 basim superius dilatata, costse triangulo medio, punctis disci 

 quinque lineaque postica transversa flexuosa nigris ; post, albido- 

 griseis ; capite albido-ochreo. 



$. 16-20 mm, Head clear whitish-ochreous. Palpi white, 

 slightly mixed with fuscous, second joint externally dark fuscous 

 except at apex. Antennse pale grey. Thorax white, somewhat 

 mixed with grey, with a suffused dark fuscous spot on shoulder. 

 Abdomen whitish-ochreous. Anterior and middle legs dark 

 fuscous, apex of joints obscurely whitish ; posterior legs ochreous- 

 whitish. Forewings elongate, moderate, costa moderately arched, 

 apex rounded, hindmargin very obliquely rounded ; light fuscous- 

 grey, mixed with whitish, and partially suffused with white round 



