86 Transactions.— Zoology. 
varying in strength and intensity; cilia barred with blackish and whitish. 
Hindwings moderate, hindmargin rounded ; dark fuscous; a blackish discal 
dot; a cloudy whitish irroration forming a double curved fascia beyond 
middle, and a dentate subterminal line; cilia as in forewings. 
Imitative in colour of the dark lichen-grown rocks. 
I took three specimens almost on the summit of Ben Lomond, Lake 
ee at 5,600 feet, in January. 
53. Pas. mechanitis, n.sp. 
Male, female.—19-28 mm. Forewings moderate, hindmargin CRE 
dark fuscous, densely irrorated and median band almost wholly suffused 
with yellow; a nearly straight yellow or whitish line towards base, anteriorly 
strongly blackish-margined ; an irregularly curved white line at +, poste- 
riorly strongly blackish-margined; a small blackish discal dot; an irregu- 
larly angulated slender dark fuscous median line, beyond which is another 
almost confluent with next line; a white line beyond middle, anteriorly 
strongly blackish-margined, strongly angulated in middle, subdentate be- 
neath; a slender very sharply dentate irregular yellow subterminal line ; 
cilia with basal half dark grey, apical half wholly white. Hindwings dark 
fuscous, base irrorated with yellow; an irregular obscure yellow fascia 
before middle; a white sinuate median line, sometimes yellow above; sub- 
terminal line and cilia as in forewings. | 
Constant, except that the white markings tend to be suffused with 
yellow. 
Arthur’s Pass (3,100 to 4,600 feet), and Mount Hutt, common in 
grassy places on the mountains, from January to March; fifteen speci- 
mens. | 
54. Pas. paradelpha, n. sp. 
Male.—21-23 mm.  Forewings moderate, costa straight, hindmargin. 
rounded; dark fuscous, densely and finely strewn with yellowish and a few 
whitish scales; a curved cloudy whitish line towards base, anteriorly 
blackish-margined ; a slightly bent whitish line at 3, posteriorly blackish- 
margined; sometimes a small blackish discal dot, and slender curved 
median line; a clearly marked white line beyond middle, anteriorly . 
strongly blackish-margined, shortly and obtusely angulated in middle, and 
inner margin shortly toothed above and below middle; an irregular sinuate 
subdentate whitish-yellowish subterminal line: cilia im basal half dark 
grey, apical half sharply barred with dark fuscous and white. Hindwings 
somewhat elongate, hindmargin rounded; dark fuscous; basal half irro- 
rated with pale yellowish; a very obscure curved whitish shade before 
middle ; a well-defined strongly-curved white median line; a very irregular 
subdentate whitish-yellowish subterminal line ; cilia as in forewings. 
