206 



Transactions. 



Dorsally : The prothorax is a very narrow strip ; the mesothorax and 

 metathorax fairly large ; only a small portion of the hindwings is exposed ; 

 spiracles on all the abdominal segments 1 to 8 inclusive, and situated on 

 prominent elevations, the greatest being on the second segment ; segments 

 3, 4, 5, 6, 7, bear a single row of small stout brown spines near their upper 

 margin, this line is interrupted in the centre by the medio-dorsal ridge 

 and extends laterad to within a short distance of the spiracular elevation ; 

 segment 10 bears a pair of fairly prominent upcurved booklets, dark brown 

 in colour. The surface of the abdominal segments is slightly roughened 

 dorsally by a minute pile when viewed with a \ in. objective. Head-sutures 

 not very distinct. A slightly elevated medio-dorsal ridge extends from 

 the eighth segment to the prothorax. Free movement between all the 

 abdominal segments except the two caudal ones. 



Laterally the head is situated somewhat ventrad. The ventral outline 

 is slightly convex, almost straight. Dorsal profile well rounded ; meso- 

 thorax slightly prominent anteriorly ; first abdominal segment somewhat 

 sunken ; abdomen well rounded ; spiracular eminences very prominent, 

 in descending order of magnitude from above down, the second being the 

 largest. The two upturned hooks on segment 10 conspicuous. Forewing 

 occupies about one-third of the whole lateral body-surface. Head and 

 thoracic appendages occupy the cephalo-frontal third, the abdomen the 

 caudo-dorsal third. Colour at first pale green, later changing to dark grey. 



Male. — The abdominal segments 3, 4, 5, 6, 7, and 8 bear the dorsal 

 row of spines ; the antennae are slightly longer than the second legs, 

 and the forewings slightly longer than the third legs, these latter extend- 

 ing as far as the caudal extremity of the last segment. The chief sexual 

 differences are the presence of the dorsal spines on segment 8 and the 

 greater length of the antennae. 



Dehiscence. 



The pupa is extruded from the cocoon to a level a little below the end 

 of the second legs. Splitting takes place vertically on the. dorsum along 

 the mid-dorsal ridge of the vertex, prothorax, and mesothorax, and 

 transversely along the epicranial suture as far laterad as the antennae. 

 Cephalad the basal joint and rest of the antennae become detached in one 

 piece, but this remains attached to the narrow strip of the vertex which 

 keeps it from becoming displaced and lost ; the antenna usually remains 

 more or less attached to the other appendages caudad. The headpiece 

 remains attached ventrad to the mandibles and other structures. 



After emerging the moth usually rests upon some horizontal surface 

 while the wings attain their full length ; this accomplished, they are thrown 

 perpendicularly over the back, their dorsal surfaces in contact, and remain 



