no 
PACIFIC SCIENCE, VoL VI, April, 1952 
oblique serrate basal carina, 1 outer and 3 
inner apical spines. 
Male genitalia large. Proctiger strongly, 
roundly produced caudad with small apical 
epiphysis, long setae along margin, black 
basally and anteriorly at apex. Forceps shorter 
than proctiger, in lateral view broad at base, 
nearly parallel margined, near apex caudal 
margin abruptly excavate, anterior margin 
continued as black, blunt, incurved tooth; in 
caudal view touching basally, stout, arched 
to sharp black tips, medial surface thickly set 
with setae. Female genital segment shorter 
than rest of abdomen, dorsal valve sinuate, 
apical portion attenuate, dark, upturned 
apically to sharp tip, a tuft of long setae on 
dorsal surface; ventral valve shorter than 
dorsal, sharp apically, set with short stout 
setae. 
HOLOTYPE, male, allotype, female, reared 
from pseudogalls formed by the curling edges 
of young leaves of Olearia ilkifolia, taken at 
Waituhi Trig in the Huahangaroa Moun- 
tains, December 8; numerous paratypes, 
mostly males, with same data. Additional 
paratypes as follows: 4 swept from host plant 
at Waituhi Trig, December 8; numerous males 
and females swept and reared from host plant, 
near Homer Tunnel, January 23; numerous 
males and females swept and reared from host 
plant near Tokanui, February 3 . A few nymphs, 
taken from galls on Olearia ilicifolia, Mount 
Egmont, April 22, 1946, by M. W. Carter, 
also seem to be this species. 
HOST PLANT: Olearia Hid folia Hook. 
Through the courtesy of Dr. W. Cottier, I 
received some twigs of Olearia ilidfolia with 
galls and nymphs taken in a nursery at New 
Plymouth in October and the additional in- 
formation that the insect was in epidemic pro- 
portion throughout the King Country where 
the plant is rather widely used as a hedge 
plant. The area near Waituhi Trig had an 
almost solid stand of the host and practically 
every young leaf was distorted by the feeding 
of the nymphs. 
At Waituhi Trig, syrphid larvae were feed- 
ing on the nymphs, and one adult was reared 
out. It was determined by Dr. David Miller to 
be an undescribed species, apparently be- 
longing to the genus Platycheirus. 
This species is similar to T. subacuta (Ferris 
and Klyver) but is distinguishable by the 
much broader and rounded wings, the up- 
curved tip of the dorsal valve of the female, 
and by the shape of the male forceps. 
In his paper of 1880, Masked states 'T 
have found, on Olearia ilidfolia, another 
species [of Powellia\, wanting the long glassy 
fringe of the earlier stage, and having, in- 
stead, a row of lanceolate spines. I would call 
this species P. doryphorad It is probable that 
the species here described is the same as that 
which Masked had, although this comment 
on the nymph would fit either of the two 
species known from Olearia ilidfolia equally 
wed. The nymphs do bear lanceolate setae 
scattered over the abdomen, not merely a row 
on the margin. Actually these setae are sur- 
rounded in life by a short tube of wax secreted 
from their basal plate. By fixing Masked’s 
name on this species any possible future con- 
fusion will be avoided. 
As there is no indication that any of 
Masked’s specimens of this species were pre- 
served, types are designated from the material 
at hand. 
Trioza suhvexa n. sp. 
Fig. 20. 
Length to tip of folded wings 3.25- 
3.75 mm. 
COLOR: General color cinereous to straw 
color, to green. Abdominal tergites more or 
less brown. Forewings slightly yellowish. 
structure: Body slender, small, surface 
rough, sparsely pubescent, and more or less 
covered with powdery wax. Head as wide as 
mesoscutum. Vertex nearly flat between 
lateral ocelli, bulging anteriorly over each 
antennal base. Genal processes slender, di- 
vergent, 0.8 as long as vertex, with long 
prominent setae. Eyes large, hemispherical. 
