Watt. — Leaf-mining Insects of Neiv Zealand. 443 



The Larva. 



In the first stadium the minute larva is light green in colour, head light 

 brown ; it bears no setae. These do not appear till the third and last 

 stadium, in which the general colour is light greenish-yellow with a faint 

 white spiracular line. Length 6-7 mm. ; spiracles minute, circular ; pro- 

 legs on segments 3, 4, and 5, each armed with a single short transverse 

 bar of about seven booklets. Body covered with minute hairs. Eevised 

 details of the chaetotaxy will be given in a future paper, together with 

 details of the head-sclerites, &c., when a comparison of all the Parectopa 

 larvae will be given. Number of larval stadiums three, the first and second 

 about ten days each, the third about twenty days. When full-grown the 

 larva leaves the mine and descends to the vegetation round the foot of the 

 tree, amongst the dry fallen leaves of which it constructs its cocoon. 



The Cocoon. 



This is an extremely pretty little -structure of white silk ; usually con- 

 structed in some concavity ; its upper and outer surface slightly rounded, 

 and covered with minute white fleecy globules, the majority of which may 

 be removed by blowing upon them. These globules are excreted by the 

 larva during the construction of the cocoon, and are ejected from the 

 interior through rents torn in the covering of the cocoon by the larva itself, 

 eighty to a hundred or more being so ejected. The construction of the 

 cocoon occupies about two days. 



The Pupa. 



Colour white, to light yellow, to black with obscure white markings 

 (see description of a typical Parectopa pupa above). The following are the 

 chief characteristics : Head bluntly rounded ; cephalic plate small, having 

 a comparatively broad, transverse, semicircular, serrated cutting-edge ; the 

 plate is quadrilateral, being continued dorsally, and is depressed just behind 

 the cutting-edge ; the antennae extend some distance past the terminal 

 abdominal segments ; clypeus somewhat j^rominent, and bears a small 

 tubercle and seta on either side just above the labrum ; no lateral cornua 

 or frontal tubercles ; maxillary palpi quite distinct, fairly broad, sculptured 

 with fine transverse rugae ; labrum and mandibles a little distance above 

 the lower margin of the eyes ; maxillae narrow in their entire length, and 

 about one-fifth of the body-length ; first legs extend beyond the termina- 

 tion of the maxillae and meet in the mid-line, about one-quarter the body- 

 length, their femora occupying a long narrow strip along the outer lateral 

 margin of the maxillae ; second and third legs as in type ; prothorax 

 quadrilateral, occupying a narrow strip between the antennae, only slightly 

 narrower in the mid-dorsal region ; setae present but extremely minute, 

 only the dorsal pair being present in the meso- and meta-thorax and first 

 abdominal segment ; in segments 2 to 6 inclusive the same three pairs 

 of setae as in type ; in segment 7 the dorsal pair only, and no setae were 

 discovered in segments 8, 9, and 10 ; no cremaster, terminal segment bluntly 

 rounded and bare ; movement takes place between 4-5, 5-6, 6-7, but the 

 pupa is not active ; no sign of any lateral flanges on the abdominal seg- 

 ments ; average length of pupa 4-5 mm. A table of the chief measurements 

 was given in the earlier paper, which "the above notes are not intended to 

 replace. Duration of the pupal stage, eleven days to a month or longer, 

 according to climatic conditions. 



