Warr.—Leaf-mining Insects of New Zealand. 475 
found in short series, half a dozen or so, and none of these may contain 
an ovu they have been made by the same individual for urposes of 
refreshment only, the exuding sap from the freshly punctured hole being 
eagerly sucked up. The majority of the “ egg-pockets” are really con- 
structed for this purpose—apparently a common habit among most leaf- 
mining flies. 
Full-grown larva—length 4mm., pale-yellowish anteriorly, dark green 
posteriorly, shiny. Larval existence from two to four weeks under favour- 
able conditions. Number of instars three; number of teeth on mandi- 
bular sclerite in each instar two. Length of pharyngeal skeleton, exclusive 
of mandibular sclerite—first instar, 0-18 mm. ; secon instar, 0-25 mm. ; 
third instar, 0-37 mm. Length of mandibular sclerite — first instar. 
0-05 mm. ; second instar, 0-08 mm. ; third instar, 0:1 mm. First moult 
occurs at а point in mine about 1:5 ст. from start, second moult about 
5-6 em. from start. 
The Mine. (Plate 38, fig. 1; Plate 40, figs. 1—3, 5.) 
vermiform in character, contiguous loops running so close as almost to 
form a blotch of the whole. Total length of mine averages about 14 cm. 
First one or two centimetres frequently closely looped around egg-pocket 
and would appear to be wound spirally round it for six or seven turns, and 
in some of the larger fleshy-leaved veronicas this is actually the case. 
“ Herring-boning," caused by the manner of fee ing, is a very marked 
characteristic (see Plate 38, fig. 1), and makes the mine a most beautiful 
ject when viewed by transmitted light with the low powers of a micro- 
half of leaf, and area is just saved from being a blotch through intervening 
When full-grown, larva emerges by semicircular cut in epidermis of leaf at 
end of mine; in almost every case escape is made through roof of gallery. 
Position of moults can easily be found as before. — . 
