300 SPOLIA ZEYLANICA. 
upwards and outwards. There are no urticating hairs at this 
stage. The length increases to 13 mm. before changing. 
The cast skin is not eaten. When very young the larve web 
the food plant, but only for the first few days of larval life. 
After the first skin change, the appearance of the larve is 
unchanged as regards the thorax, save that the yellow patch 
is not so broad, but abdominally dorsally there is a broad 
bluish band with darker striz. Dorsally on the eighth 
abdominal segment a black cushion with white tips to hairs. 
The black and white bands remain laterally. Thoracic lateral 
hairs white and thick, abdomen up to eighth segment almost 
naked. The meso- and meta-thoracic bands of black urti- - 
cating hairs develop in this instar. These are situated in folds 
on the upper surface of these segments, and are erectile when 
disturbed. Towards the end of the instar the white abdo- 
minal bands turn yellowish, and are indistinguishable. Head 
blue-gray, with longitudinal black striz. The length before 
the next change is 30 mm. After this change the abdomen 
becomes entirely bluish, irrorated with yellow. As the instar 
progresses, the yellow predominates over the blue, till later- 
ally the abdomen is all yellow with darker striations. There 
is an oblique white bar on the meta-thorax—first abdominal 
segments. Length before next change 50 mm. The next 
is normally the last larval instar. Colour uniformly pale 
gray-brown with darker striz all over. On meso- and meta- 
thorax are fan-shaped tufts of black erectile very urticating 
hairs, barbed, which, if they enter the skin, set up severe 
irritation, which persists for 48 hours or more. On the eighth 
abdominal segment dorsally is a dark hair cushion. On each 
segment sub-infra-spiracularly are downly-directed gray 
hairs, with some, shorter, whitely spatulate. The hairs at the 
extremities are anteriorly and posteriorly directed, those on 
the thorax make tufts, not pencils. There are five pairs of 
prolegs, the anal pair spread sideways and nearly hidden in 
hair. Head brownish, with four vertical lines on the occiput, 
the two central ones shorter, basal joint of antenne and clypeus 
white. All legs brown. The ventral colour is pink with 
median orange bar, and black bands to segments. Length, 
full grown: male 75 mm., female 140 mm., though bred 
