338 Transactions. 



Hydriomenidae. 

 Xanthorhoe clandestina n. sp. 



<$. 35 mm. Head and palpi grey-whitish. Eyes olive-brown. Antennae 

 dark grey, pectinations 5 but appearing shorter owing to being basally 

 arjpressed to the shaft. Thorax grey. Abdomen whitish-grey. Fore- 

 wings elongate-triangular, costa sinuate, apex bluntly pointed, termen 

 straight, oblique ; bluish-grey ; lines faintly indicated in darker ; an irregular 

 basal line at \ ; first line at ^, double, slightly waved ; discal spot rather 

 elongate, transverse, dark ; a fairly straight, slightly waved, median line ; 

 second line from § costa to f dorsum, excurved on upper half, faintly 

 margined with white on veins : cilia white, basally mixed with grey. 

 Hindwings grey, slightly darker round termen : cilia white. 



The bluish-grey colour of this species recalls the much larger X. sub- 

 obscurata (Walk.), but the latter differs in the presence of ochreous and 

 whitish shades. 



Arthur's Pass, in February. I am indebted to Mr. E. S. Gourlay for 

 the opportunity of describing this species, he having captured a single 

 specimen which, so far, remains unique. Type in the collection of its 

 discoverer. 



Xanthorhoe helias obscura n. subsp. 



cJ$. 26-30 mm. Head and palpi ochreous, the latter usually darker. 

 Antennae, shaft whitish-ochreous, pectinations darker. Thorax ochreous, 

 tinged with reddish on shoulders. Abdomen ochreous mixed with fuscous, 

 anal tuft bright ochreous. Legs whitish-ochreous, anterior pair suffused 

 with fuscous. Forewings dull fuscous shading to ochreous along costa ; first 

 and second lines distinct, narrow, white ; subterminal thin, whitish, some- 

 times partially obsolete : cilia pink. Hindwings ochreous, apical half 

 fuscous ; second line prominent, irregular, whitish, anteriorly fuscous- 

 margined ; one or two parallel ochreous lines sometimes follow second line, 

 and there are indications occasionally of preceding lines also : cilia pink. 



The Hump (Waiau), late in February. The males are fairly common 

 in a damp scrub-filled gully, but only one female was taken. The latter 

 sex is remarkable in having both fore and hind wings much narrowed. 



I should not hesitate to accord this form specific rank but for the fact 

 that some of the specimens, by loss of the fuscous colouring, approach the 

 typical helias. It cannot be said from the material at hand, however, that 

 the two forms really link up. 



Notoreas arcuata n. sp. 



$. 27 mm. Head, palpi, and thorax golden-yellow with some whitish 

 scales. Antennae black, annulated with whitish. Abdomen black, seg- 

 mental divisions whitish. Legs ochreous-whitish, strongly infuscated, tarsi 

 annulated with ochreous. Forewings triangular, apex obtuse, termen 

 bowed, oblique ; dark fuscous, densely irrorated with yellow ; lines narrow, 

 white, sometimes yellow-tinged ; a basal line anteriorly broadly margined 

 with black, curved, distinct, slightly irregular ; first line strongly curved, 

 irregular, posteriorly margined with black ; a black discal dot ; an obscure 

 irregular yellow median line ; second line anteriorly broadly margined 



