102 
PACIFIC SCIENCE, VoL VI, April, 1952 
This species is a variation from the vltreo- 
radiata type, the male genitalia in particular 
being merely a more extreme form of the 
same structure pattern. 
Trioza bifida (Ferris and Klyver) 
1932 Powellia bifida Ferris and Klyver, New 
Zeal. Inst., Trans. 63: 38, 39, 43, pis. 8, 
9 , 10 . 
Supplementary notes on the species are 
given. 
Length to tip of folded wings 2.75- 
3.75 mm. 
color: Color variable from general light 
green with light brown markings to yellowish 
brown with dark brown markings. Abdomen 
usually dark. Forewings fumate. 
STRUCTURE: Body quite robust, surface 
shining, prominently punctate or imbricate. 
Head narrower than thorax. Vertex with 
strong discal impressions, bulging anteriorly. 
Genal processes slender, divergent, 0.66 as 
long as vertex. Antennae 1.6 times as long as 
width of head. 
This very distinct species was taken in 
large numbers from Olearia avicenniaefolia at 
the following localities: Takaka Hill, near 
Nelson, January 8 and 13; Whangamoa 
Saddle, January 16; near Kingston, January 
22; near Oban, January 29, 30, 31; Arthur’s 
Pass, February 5; Fox Glacier, February 7. A 
series of 12 males and females was taken from 
Metrosideros umhellata Car. near the top of 
Arthur’s Pass on the Otira side. One hour 
was spent in obtaining this short series as I 
thought it possible that it was a distinct 
species inhabiting the rata. As there was 0. 
avicenniaefiolia in the area, no significance can 
be attached to this collection. As this is a 
very active species, such chance occurrence 
on plants other than the host is to be ex-, 
pected. Occasional specimens were taken on 
several other plants, especially other species 
of Olearia where they were growing inter- 
mingled with avicenniaefiolia. 
On March 7, on the seashore near The 
Glen, Nelson, adults, eggs, and nymphs were 
taken in great numbers on Shawia [Olearia] 
paniculata. In this collection and those made 
at Arthur’s Pass and Fox Glacier there are two 
distinct sizes, the smaller females being as 
small as the smallest males. The smaller form 
(2.75-3.0 mm.) is much darker in color, but 
no other difference is discernible. 
HOST PLANTS: Olearia avicenniaefiolia Hook, 
and Shawia [Olearia\ paniculata Cheesem. 
Trioza gourlayi n. sp. 
Fig. 13 
Length to tip of folded wings 3.0-3.25 mm. 
COLOR: General color reddish brown to 
dark brown, vertex lighter. Genal processes 
green, black tipped. Forewings yellowish, 
transparent. 
STRUCTURE: Body surface finely punctate, 
more or less completely dusted with powdery 
wax, with short, sparse pubescence. Head 
wider than mesoscutum. Vertex with very 
strong discal impressions. Genal processes 
slender, conical, divergent, 0.66 as long as 
vertex. Antennae 1.33 times as long as width 
of head. Eyes large, hemispherical. Pronotum 
very short, strongly depressed. Forewings 
rounded apically, membrane with prominent 
points except along veins; Rs long, sinuate, 
marginal cells nearly equal. Metatibiae with 
prominent basal serrations, 1 outer and 3 
inner apical spines. 
Male genitalia large. Proctiger long, 
straight, narrowed apically to small epiphysis. 
Forceps long (shorter than proctiger) ; in 
lateral view slightly curved cephalad, deeply 
notched at apex, anterior lobe blunt, pos- 
terior acute, black; in caudal view touching 
basally, stout then narrow, nearly straight to 
black tips. Female genital segment longer 
than rest of abdomen, large basally, strongly 
narrowed and attenuate in apical half, dorsal 
valve longer than ventral, spinose, tip blunt, 
ventral valve with numerous very small setae 
toward apex, tip sharp. 
HOLOTYPE, female, allotype, male, 4 female 
and 2 male paratypes. Skipper’s Bridge, De- 
