108 MR, H. S. LEIGH ON THE [ Feb. 2, 
length, but apart from size differs little from that of the previous 
stage. The sexes, so far as I could see, were indistinguishable at 
this stage. 
In the third stadium the external sexual characteristics first 
make their appearance. The females are somewhat larger than 
the males, the former being 28 mm. in length, the latter about 
26 mm., whilst the flattened expansions of the abdomen are 
slightly broader in the females than in the males. The future 
wings of the male, although at present very insignificant, may 
now be seen in the form of two small processes on the metathorax ; 
these being entirely absent in the females. Further, the legs of 
the male larve are beautifully mottled with irregular patches of 
brown and yellow, those of the female being generally without 
these decorative markings. The fourth larval stadium is charac- 
terised by increased sexual dimorphism ; the male is about 33 mm. 
in length and 19 mm. in greatest breadth ; the antenne have now 
increased a little in length, being 3 mm.; and the future tegmina 
and wings are present in the form of processes about 4 mm. and 
2 mm. long respectively. The female is larger and of a somewhat 
rounder shape; length 35 mm., breadth 19 mm. The femora of 
the prothoracic legs are of wider proportions than those of the 
male, whilst the femora of the mesothoracic legs have, in the 
middle of their posterior lobe, a brownish spot which is seldom 
present in so decided a form in the male larve. The future 
tegmina may be noticed in the shape of two small processes, 
about 14 mm. in length; the antenne remain short, in contrast 
to those of the male. The sexual dimorphism becomes gradually 
more pronounced at each of the succeeding stadia, and reaches its 
fullest significance in the adult condition. In the penultimate 
stage the sexes are very dissimilar; the male*is about 55 mm. 
in length, 25 mm. in greatest breadth; has moderately long 
antennz ; the future tegmina and wings are well defined as two 
pairs of dorsal appendages, and the expansions of the prothoracic 
legs are comparatively small. The female is altogether much 
larger, being about 70 mm. long and 35 mm. broad; has short 
antenne ; only one pair of dorsal appendages (tegmina), and the 
foliaceous expansions of the prothoracic legs are very large. 
The larve throughout their lives are diurnal, but seem to. 
show a decided partiality to feeding during the first and last 
hours of daylight; food is taken at other times of the day, but 
a decided preference is shown (at all events in the earlier larval 
stages) for the twilight. As the sun sinks below the horizon 
and the light fails the larve begin operations by a number of 
preliminary swinging moyements, after which they move in a 
very hesitating fashion in search of food; having discovered 
the leaves that are palatable to them, they feed with great. 
avidity for fifteen or twenty minutes. At the end of this time 
darkness has usually set in and the larve once more settle down 
to await the morning, when the same operations are repeated. 
I found that the last larval stadium is frequently prolonged 
