TERIAS. 427 
T. laia is very commou in Japan and China in the autumn, and appears 
again after hibernation. The specimens differ from N.W. Himalayan 
examples, of which I have a long series, in having scarcely any black mark- 
ings on margins of secondaries, and in the redder tone of under surface. 
Extreme examples of this form from Japan and South Corea are described by 
Mr. Butler as T. siibfervens. 
The late Mr. Henry Pryer (/. c. p. 21) placed T. hefhesha, Janson, as a 
synonym of T. laia, Boisduval, and merged both in T. biformis, Pryer, giving 
the foiloAving reasons for doing so : — " I have, in conjunction with Mr. Nawa, 
of Gifu, made an extremely interesting and important discovery. It is that 
T. hethesha is the summer form, and T. lata the winter form, of one and the 
same species. This was quite unexpected. Both Mr. Nawa and myself saw 
females of T. hefhesha depositing their eggs on Cassia mimosoides. From 
these eggs we reared many specimens of T. lata, but not a single individual 
bearing the most remote resemblance to the parent form of hethesha. I 
have, however, reared a single specimen from these hethesha ova which 
strongly resembles the hecahe form of T. multiformis, and it is therefore 
probably a hybrid. The outline of the wing of lata is pointed, that of 
hethesha rounded, and the former is a much larger insect than the latter. I 
have proposed the name of T. hiformis to unite these two forms. The form 
lata is only seven days in the pupa, but lives for eight months in the imago 
state, during which time it hibernates for from four to five months. I 
previously stated that lata appears from March to November ; this I now see 
is an error, the reverse being nearer the truth. It appears last in the year 
in November-December, and emerges from its hibernation first in March. 
The lata form emerges during the first Aveek of September, or, exceptionally, 
during the last fcAV days of August, from ova laid by the hethesha form in 
August, taking a remarkably short time to complete its metamorphosis. 
The lata form does not commence to hibernate before November, and 
continues in hibernation until the first warm days in March awaken it. 
Specimens may be seen flying about until May, when the females deposit 
their ova which produce the hethesha form in July." 
In the autumn of 1887 I was in South Kashmir, where I met with lata 
and a form which I am quite unable to separate from hethesha. Probably the 
hethesha-Vike specimens were late examples of the summer brood of lata, 
. 3l2 
