266 Transactions.— Zoology. 
a small longitudinal streak of silver between the latter streaks and the base 
of the wing ; the transverse row of spots consists of a conical spot—between 
the externo-medial and subexterno-medial nervures, with its apex pointing 
to the hind-margin; a sagittate spot between the subexterno-medial and 
interno-medial nervures; and a similar one between the externo-medial 
and subexterno-medial nervures, all bordered internally with a dusky 
shade; the latter two spots pointing towards the base of the wing, and 
each followed towards the hind-margin by a small silvery dot, between 
which and the hind-margin is a small silvery point, edged externally 
with black; a small pale, irregular subcostal mark near the base of the 
wing; and on the costa, two-thirds from the base of the wing, a larger pale 
triangular mark, followed by two pale irregular spots. 
Male and female alike, except in size. 
Expanse of Wings: male, 18} lines; female, 20 lines. 
Habitat: Whitcombe’s Pass, Canterbury, New Zealand. 
I have described this butterfly from three dilapidated specimens brought 
to me by J. D. Enys, Esq., who has favoured me with the following account of 
their capture :—‘‘I caught the three butterflies on Whitcombe’s Pass, up 
the Rakaia, on the 8th of March, 1879. The Pass is over 4000 feet, and 
the first of the butterflies was caught close to the top; the others were near 
it. They were knocked down by my hat and put in paper, which must be 
my excuse for their state. They seemed to be rather slow in their flight, 
and were chiefly found on the snow-grass (of the family Danthonia) which 
covers the slopes of the hills at that height. I saw a number, but only 
got four.” 
In the accompanying coloured drawing (Plate IX.), figure 4 represents 
the male; a, the under-side; b, the upper-side. 
I have named the butterfly after Mr. A. G. Butler, who has recently 
contributed valuable lists of, and papers on, the Lepidoptera of New Zealand, 
and to whom I am much indebted. 
[Sinee writing the above, Dr. Julius Von Haast informs me that it was 
& specimen of this butterfly which he took in 1866 on Whitcombe’s Pass, 
not of P. pluto, as he before stated (vide ** Trans. N.Z. Inst.,” Vol. IV., 
p. 217). Dr. Von Haast speaks from recollection, not having preserved the 
specimen he took.] 
