Warr.—Leaf-inining Insects of New Zealand. 685 
of mine before pupating. In trying to rear these flies I have noticed 
numbers of immature larvae leave their mines; these i 
-entered a leaf, but have crawled about the jar for some hours and then 
died without pupating. Numbers of immature mines are also to be found 
in plants growing naturally; I think such larvae have been the victims 
of parasites and that larvae do not otherwise leave the mine before 
maturity. Average duration of larval existence, fourteen days. 
The Pupa. 
Pupation occurs outside mine and generally on ground beneath food- 
plant. Healthy pupa brown; segments moderately rounded, of about 
Average duration of pupal period, twelve days. 
n pupating, larvae shun light as much as possible, seeking the 
darkest corner, but not penetrating beneath the surface of the soil. 
(30.) Agromyza urticae n. sp. (The Nettle-fly). 
The Imago. 
Male. Frons orange; ocellar triangle, eyes, and antennae black ; arista 
pubescent. Each orbit with four strong bristles ; post-vertical bristles 
onger than ocellar. 
Thorax—dorsum black, sides lemon-yellow with a relatively large rect- 
angular black area below and in front of wing-base, and several smaller 
irregular patches below base.  Halteres lemon-yellow. Seutellum broadly 
lemon-yellow. Four pairs of dorso-central bristles with three or four series 
of setulae between anterior three pairs. 
Abdominal tergites black, yellowish posteriorly. 
Legs black, lower joint of femur yellowish. ; 
ale grey, veins dark grey ; costa to fourth vein at tip of wing ; 
penultimate section of fourth vein one-sixth as long as ultimate ; and one- 
fourth as long as ultimate section of fifth. Length of wing, 2-4 mm. 
Length, about 2 mm. 
Type in author's collection; reared from mines collected by Mr. Tapley 
at Governor's Bay, Christchurch. ў 
First discovered by Мг. Tapley at Governor's Bay, in December, 1921. 
I have succeeded in rearing only a single specimen from numerous mines 
sent me by Mr. Tapley, who also obtained for me a number of the flies 
Food-plant. 
The common nettle (Urtica feroz). 
