684 Tra nsaetions. 
Thorax jet-black, shiny on dorsum; pleurae almost банер lemon- 
yellow; two or three small blackish areas ventrad, a larger r black area 
between ув сохае ; scutellum broadly lemon-yellow with a narrow 
brighter medial stripe; four pairs of dorso-central bristles, anterior two 
pairs very weak; two series of about four setulae each between the two 
anterior pairs of dorso-centrals ; apical scutellar bristles arise from yellow 
area, Men lateral scutellar bristles are outside yellow area 
n— dorsum black, posterior margins of tergites obscurely 
јајан: Ailes yellow ; under-surface dark-greyis 
egs—coxae, and femora pee with a slight obscure blackening 
externally ; tibiae and tarsi dark- 
Wings greyish, veins black ; dde, to end of fourth vein at tip of wing ; 
hind cross-vein absent; halteres lemon-ye ow 
Length, 1-3 mm. ; length of wing, 1-6 mn 
Type in author's collection ; reared from mines in silver-beet, Wanganui. 
Distribution. 
Recorded from Wanganui, Auckland, and Napier (L. A. Hay), Governor's 
Bay, Christchurch (PAPER and is probably widely distributed throughout 
New Zealand. Appears to be most plentiful about December. 
Food-plants. 
Has been reared from white and silver beet, spinach, mouse-ear chick- 
weed (Cerastium vulgatum), common chickweek (Stellaria media), and 
fat-hen (Chenopodium album). 
Egg-laying and Larva. 
Eggs laid singly in minute — ers асра under upper 
cuticle of leaf. Average diameter of egg-pocket, 0-7 
ull-grown larva ане. intestinal tract filled. with dark-green 
food and very conspicuous through the transparent skin. Colour whitish 
anteriorly, greenish posteriorly, extreme ag csl end yellow. Posterior 
respiratory processes Jong and prominent. Average length of full-grown 
larva, about 1-7mm. Each half of mandibular sclerite with =ч = 
prominent teeth. First moult occurs about 8mm. along mine from egg- 
pocket; length of cast pharyngeal skeleton, 0-1 mm. Second moult у 
18 mm. from pocket; cast pharyngeal skeleton, 0-15 mm. in length. 
The Mine. (Plate 68, fig. 4.) 
A simple gallery, more or less narrow, tortuous, and gradually ра 
ing. Greatest final width averages 1 mm. ; average length, 40-60 mm. ; 
width at commencement, 0-14 mm. Best seen on upper surface a ie 
but may be in part or wholly on under-surface. Colour pale green when 
fresh, rapidly becoming white ; there is no discoloration of leaf other than 
this. Sometimes short blind branches may be found; margins of 
are somewhat uneven bod a lens. In small leaves, or lei several larvae 
and heoome wach екы , but Шей. 18 never оиа Mines 
