48 
of filv/ravuiiaria (though not all) had the lobes more or less brown. 
At this period, therefore, the larvae were still distinguishable from 
even the wholly green form of dilutata. But as they advanced towards 
full growth, they tended more and more to approach a uniform type 
of coloration, and that, curiously enough, was almost exactly that of 
dilutata in its green form, and, therefore, quite a contrast to full-fed 
riiit/raniinaria. That is to say, the larvae of autmunata (except a very 
small percentage of more strongly marked specimens) became, when 
full-grown, of a nearly unicolorous bright apple-green, the subdorsal 
lines and pale tubercular dots becoming very inconspicuous, and in 
many specimens even the lateral stripe also becoming so, except on 
the last few segments. At this stage it conforms to G uenee’s description 
of the larva of his autmunata (var. t/ueneata), and if he studied only 
full-grown larvae, and from but one locality and food-plant, he could 
easily have described the species as not varying at all." On two 
separate occasions I compared these full-fed autmunata with the green 
form of dilutata of the same age, and it would hardly be exaggerating 
to say that their general aspect was identical; autmunata appeared 
slightly the more yellowish-green, dilutata slightly the more bluish; 
in autmunata the pale subdorsal lines were still faintly traceable, in 
dilutata quite obsolete ; in autmunata the pale trapezoidal spots were 
slightly more noticeable than in dilutata: in autmunata the minute 
spiracular dots were darker than in dilutata , though still by no means 
black ; in dilutata they were red, extremely inconspicuous, and 
surrounded with a halo of yellow, which was not observable in 
autmunata ; in both the broods compared, the head was green, the 
lateral line yellow, but in many dilutata the latter is white or nearly 
so—sometimes almost snowy. The general constancy of autmunata at 
this stage, compared with the enormous variability of dilutata, was 
very striking. 
The larvae went to earth in about six to nine days from the final 
moult; the whole larval period would thus reach from about 25 to 86 
days, according to temperature and other circumstances; at least one 
larva, which was specially noticed, went down only 25 days after- 
hatching, the dates being March 18th to April 12th, 1898. 
At large, the larva of this species appears generally to be met with 
in May and June, though one record for July (Andersson, Knt. Tidskr., 
v., p. 187) probably belongs here. Mr. Allen, at Enniskillen, took 
larvre on April 28th, May 8th, 14th and 27th, 1898, two of which 
were full-fed on May 14th ; some were still feeding on May 81st, but 
all the healthy ones had gone down by June 10th. Dilutata taken 
from hawthorn near by on May 14th and 19th had all gone down 
(except sickly ones) hy the end of the month, and Mr. Allen writes (in 
lift., November 11th, 1898) that “ autmunata seems to be just a little 
later all through, than dilutata." 
It may be well here to summarise the most important points in the 
above notes on the larvre. 
autmunata with jilitiraniinaria. Never any very momentous 
differences. In the second instar, autmunata much less definite green 
than tilinrannnana, more olivaceous, or even grey ; in the fifth instar 
much more unicolorous than jilitiraniinaria, generally lighter and 
brighter green, yellow longitudinal lines much more tending to 
obsolescence; no noteworthy difference in other stages. Autmunata 
