468 Transactions. 
three to four generations. Imagines found in the greatest numbers during 
February, April, October, and December. 
Easily distinguished from A. flavocentralis, also common on the same 
food-plant, by its darker colour, and especially by absence of yellow spot 
on the scutellum, which in the latter species is а most conspicuous mark. 
Food-plants. 
Has been reared from Veronica speciosa, V. salicifolia (koromiko), an 
a number of the larger-leaved hybrid veronicas. 
and only available surface in the buds, which are the favourite site for — 
oviposition. Duration of egg stage not known ; possibly not longer than а a 
fortnight. 
Full-grown larva about 4 mm. in length, yellowish-green, shiny. Fi 
moult takes place in preliminary gallery on underside of leaf ; second moult 
normally about 6 mm. along the mine on upper side of leaf. Pharyng 
skeleton fairly stout; number of teeth on mandibular sclerite in all three — 
instars is two. Length of pharyngeal skeleton, exclusive of mandibular x 
sclerite—first instar, 0-20 mm.; second instar, 0:30 mm.; third instar, 
0-43 mm. Length of mandibular sclerite—first instar, 0-03 mm. ; second 
instar, 0-05 mm. ; third instar, 0-08 mm. 
The Mine. (Plate 38, fig. 3; Plate 40, fig. 6.) 
Mine is a composite one, consisting of gallery and blotch. pe- 
portion mainly situated on under-surface of leaf; narrow and so closely — 
looped back and forth that the various portions eventually anastomose and — 
form a false blotch ; this part of the gallery may be 4-7 em. in length, but 
owing to looped character the false blotch will rarely exceed 1:5 em. In 
length ; direction is in the long axis of leaf, and mine usually close against — 
midrib; colour pale green, earlier parts whitish; frass scanty, Ver 
scattered. Many larvae spend the winter months in this preliminary part 
of the mine. 
ery fine, — 
E 
Larva sooner or later leaves under-surface and mines close Up against с. 
upper cuticle, the mine rapidly widening во as to form eventually y | 
, 
shaped blotch. Margins shallowly dentate. Average size of blotch—len 
2:bem.; greatest diameter, 1:25 ет. Direction of blotch, as а rule; 308 _. 
relatively scanty, deposited mostly on roof of mine in track of ye 
larger leaves several mines occupy same leaf, but galleries and blote 
different larvae never anastomose. 
dens ^ 
