Psyllidae of New Zealand ■— TutHILL 
97 
The comparative rarity of this species dur- 
ing the season 1950-51 must be unusual. 
Otherwise, it would be unable to maintain 
itself in competition with clavata. 
Ctenarytaina thysanura Ferris and Klyver 
1932 Ctenarytaina thysanura Ferris and Klyver, 
New Zeal. Inst., Trans. 63: 55, 56, pis. 
14, 16. 
Length to tip of folded wings 1.25 mm. 
I did not collect any specimens of this 
minute species, but specimens were made 
available to me by Woodward, Cottier, and 
Miller. It apparently is quite common on its 
host throughout New Zealand. 
HOST PLANT: Boronta sp. 
Ctenarytaina eucalypti (Maskell) 
Fig. 9 
1890 Rhinocola eucalypti Maskell, New Zeal. 
Inst., Trans. 22: I60. 
Length to tip of folded wings 1. 5-2.0 mm. 
MaskelFs extended description of this 
species is quite good. Additional data are: 
Antennae 1.3 times as long as width of head. 
Metatibiae with 5 short black apical spines. 
Proximal segment of metatarsi with 2 black 
claws. 
Many specimens in all stages of develop- 
ment were taken at several localities on both 
North and South Islands, including Tauranga, 
Palmerston North, and Ashburton. They ap- 
pear to occur only on the young growth, the 
first specimens being taken in October. 
HOST PLANT: Eucalyptus globulus Labill. 
This species was also taken on Eucalyptus 
hicostata in Canberra, Australia. 
TRIOZINAE 
A single ubiquitous genus, Trioza, repre- 
sents this subfamily in New Zealand. 
The well- developed radular areas on the 
forewings, alar radulae, which are so typical 
of this subfamily, are very strongly developed 
in many of the New Zealand species. The 
function of these structures is unknown but 
the presence of a raised area on the marginal 
vein at the base of the radula on many of these 
species suggests that they are stridulatory. As 
many of the species can be observed to rub 
their wings slightly when alive this seems 
more probable. 
Genus Trioza Forster 
1879 Eowellia Maskell, New Zeal. Inst., Trans. 
11: 223. 
In his 1880 paper on Coccidae, Maskell 
transferred his genus Eowellia^ which he es- 
tablished on nymphal material, from the 
Fig. 9. Ctenarytaina eucalypti (Maskell). a, Lateral aspect of male cauda; b, inner aspect of clasper; c, lateral 
aspect of female cauda. 
