THE GENUS AORONYCTA AND ITS ALLIES. 
249 
segment. The legs of 4th segment touch or cross the prolegs 
of 7th. The head is prone (vertex backwards, jaws forwards), 
and in connection with this there is a certain amount of retrac- 
tion of the 2nd segment within the 3rd, and even of 3rd within 
4th, so that the dorsal tubercle of 3rd, instead of facing upwards, 
faces forwards, being on the edge of the fold formed by the 
front of the segment being folded inwards. The long hairs 
directed forwards are those of the 3rd segment. These hairs 
measure nearly 8 mm., those on 12 and 13, 5-6 mm., the others 
along the dorsum 2-3 mm. The rich chocolate back has the 
same outline as in the previous skin, and the tubercles are light 
and dark in the same way ; the tubercles in it are black, often 
with a pale or even nearly white point at the base of the hair. 
The band is bordered by a yellow line, which is orange close to 
the chocolate band. There is also a tendency to a pale dorsal 
line. The nth segment still has hairs much shorter than any 
other, the 12th segment forms quite a hump, culminating at 
the posterior trapezoidals. It may be noted that all the tuber- 
cles remain very distinct, more so indeed than in any other, 
even alni or megacephala, and do not become fused or lost as in 
psi or leporina. The posterior trapezoidals in 5 form prominent 
projections, but that segment can hardly be called humped ; 
8, g, and 10 have similar though smaller prominences. The 
spiracles are white in a black circle, that on 12 very large and 
distinct. Prolegs with a beautiful pink tint. Head in one or 
two nearly black, on most deep umber on vertex, passing into 
peach towards the mouth, and with varying amounts of black 
marbling. The form, and in some instances marking, very 
like megacephala. In one specimen the green is overlaid by a 
deep smoky tint, but not so dark but that the dorsal band with 
its paler margin is easily distinguishable. The whole surface 
is studded with the minute hairs or hair points noticed in the 
last skin ; these are black and more pronounced in the dark 
dorsal streak. One of small ones laid up for moult August i6th. 
August 17th. — Two small are laid up. August i8th. — All the 
smaller laid up except the ist ; which has changed into the last 
skin, so that it is now obvious that the mass are 4-moulters, 
the 4 exceptional ones 5-moulters. The 5-moulters in 5th 
skin do not differ much from 4th skin, the broad stripe on 
back is less deep in colour than in last skin, less definite in its 
margins, and has not the distinct orange and red margin of 
dorsal line. On the loth segment the posterior trapezoidal, 
though within the brown band, is green, and looks like an inva- 
