Watt. — Leaf-mining Insects of New Zealand. 



219 



but only occupy a small area; they are somewhat more evident in the 

 female and almost meet in the mid-line. The tibiae of 2 appear as a slight 

 caudal extension of the first legs, and are more evident in the female. 

 Third legs appear from beneath the caudal extremities of 2, and, meeting 

 in the mid-line, extend in the male as far as the lower margin of the last 

 segment, in the female to a little below the upper margin of the eighth 

 segment. Antennae rather wide, segmented : in the male fall slightly 

 short of the caudal extremities of the fore wings and third legs ; in the 

 female extend only a slight distance beyond the second legs and third 

 tibiae. Coxae relatively narrow ; the first are the longest, and the third 

 are slightly longer than the second. A variable amount of the ventral 

 abdominal surface can be seen below the third coxae between these and the 

 second and upper part of the third legs. Forewings occupy only a narrow 

 strip ventrally, extending not quite so far caudad as the third legs. A very 

 narrow slip of the hindwings may extend a short distance beyond their 

 tips, more marked in the female. 



Dorsally : Prothorax very narrow and almost obliterated in the mid- 

 line. Spiracles on prominent elevations on segments 1 to 8. A single 

 transverse row of small dorsal spines in the fore part of segments 3 to 7 

 inclusive in the female, 3 to 8 inclusive in the male ; interrupted in the 

 mid-dorsal line. The small pair of dorsal upcurved hooks appear to be 

 on segment 10 in the male and segment 9 in the female. It appears that 

 movement can take place between all the abdominal segments excepting 

 the last three. Colour at first pale green, changing later to dark grey. 



Pupal period varies according to climatic conditions. I have reared 

 imagines towards the end of September from larvae that pupated in the 

 middle of July. The following periods are from my note-book : One 

 .specimen pupated 28th March, 1920: emerged 30th May, 1919 — sixty-one 

 days. Larvae pupated 24th May. 1919: emerged 13th July, 1919 — forty- 

 nine days. Pupated 15th July, 1920: emerged 28th September, 1920— 

 seventy five days. During October and November. 1919, pupal period not 

 longer than twenty-one days. 



Dehiscence. 



Vertical splitting takes place dorsally along the mid-line of the meso- 

 thorax and prothorax, and transversely along the epicranial suture. The 

 antennae become almost completely detached, only a small slip of the 

 vertex retaining them dorsally ; thus the head is freed laterally and 

 dorsally, but remains attached ventrally. 



Before emergence the pupa is extruded from the cocoon as far as the 

 fourth or fifth abdominal segment. 



