224 The Philippine Journal of Science 1921 
segment with a median thorn at the tip; laterally and dorsally numerous 
granules bearing small hairs; in the later stages the warts completely 
obsolescent, but the segments swollen transversely at the corresponding 
places. Cremaster of pupa sharp with curved bristles. 
Cocoon loose, between leaves and moss or below the surface. 
Jordan 25 describes the larva of Aglia tau as follows: 
Larva green with light lateral stripes directed obliquely up- and back- 
ward, below the stigmata a light longitudinal line with a reddish edge, the 
line widened on segment 4 to form a black-centered spot. On deciduous 
trees especially Beech, Oak, Birch, etc. Pupa hibernates. Moth from 
March to June according to the locality, in the North later than in the 
South; the <$<$ fly by day and are very restless, the 2? remain on tree- 
trunks and on the ground. In the Central and Southern districts of 
Northern Europe, eastward to Japan; not in England and the Mediter- 
ranean countries. 
Kirby 26 remarks : 
The larva [of Aglia tau ] is green, with five red spines when young, 
which it loses when full grown. It has yellowish-white oblique stripes on 
the side, running upwards and forwards, and a yellowish line on the sides, 
which is broadest on the 4th segment. It feeds on beech, lime and oak in 
June and July. 
The original figure of my larva of var. japonica Leech agrees 
well with the description given by Jordan of Aglia tau Linn., 
but he does not give the number of the oblique lateral stripes 
which, in my larva, are seven in number and of a whitish color. 
Poulton 27 remarks : 
The larva of the European Tau Emperor ( Aglia tau) has an eye-like 
mark which it can expose when attacked, but which is otherwise concealed. 
The appearance of the larva in its terrifying attitude is shown in fig. 58. 
This larva is an example of the form of protective mimicry 
alluded to by Poulton under pseudaposematic colors . 28 In the 
figure of my larva (Plate 2 , fig. 7) the eyelike spot on segment 
5 does not seem to be fully expanded. 
Local distribution of Aglia tau var. japonica. — Honshu, Shi- 
motsuke Province, Nikko, May (Wileman) . Hokkaido, Oshima 
Province, Hakodate and Jansai Numa, June and July ( Wileman ) . 
Matsumura records var. japonica from Honshu and Hokkaido. 
Time of appearance. — Larva, August; imago, May to July. In 
Hokkaido the larva pupates in September, and the imago emerges 
in July of the following year. 
26 Loc. cit. 
“European Butterflies and Moths (1889) 125. 
27 The Colours of Animals (1890) 264, fig. 58. 
2S Vide Philip. Journ. Sci. § D 9 (1914) table 1, facing page 248. 
