Psyllidae of New Zealand — TutHILL 
87 
two distinct groups. The first group of nine 
species (P. acaciae and related forms) are un- 
doubtedly introduced from Australia, with 
one exception, and appear to be limited to 
their introduced host plants. The exception is 
P. dodonaeae^ found abundantly on Dodonaea 
visma, a plant which has a very wide distri- 
bution in the tropical and warm temperate 
parts of the world. No psyllids have been re- 
corded from it elsewhere, hence the status of 
this New Zealand species remains doubtful. 
It appears to be a natural migrant here, how- 
ever, as there is no reason to believe that it 
was introduced by man. These species belong 
to the group which Heslop-Harrison recently 
treated as a distinct genus, Acizzia. In my 
opinion, although they constitute a natural 
group of species, they are not sufficiently dis- 
tinct to warrant generic status and are more 
properly considered as a subgenus. The dis- 
tinctive type of male proctiger of most of 
those known is the principal difference from 
the structure of typical Psylla, but this is not 
present in all the Australian forms. The ten- 
dency for the genal processes to cover the 
frons only incompletely is also not universal 
in the obviously related Australian species, 
nor is it limited to these Australian species, as 
several North American species exhibit the 
same trait. The prothoracic pleura vary in 
shape, and in some of the species, notably 
acaciae -haileyanae, they are of the form found 
in Arytaina. It is apparent that this character 
alone is insufficient for generic separation in 
the species here being considered, as they are 
obviously closely related forms. This seems 
to call for a reassessment of this and other 
characters used for generic separation in the 
entire subfamily. Fortunately, Heslop-Harri- 
son has undertaken this difficult task. 
The second group consists of endemic 
species, P. apicalis Ferris and Klyver and P. 
carmichaeliae n. sp. They are certainly not 
closely related to the introduced Australian 
species. P. apicalis appears to show relation- 
ship to Euphalerus nidifex, an American 
species. P. carmichaeliae is reminiscent of 
some of the North American species referred 
to Arytaina. For the present it seems best to 
place them in Psylla and avoid undue multi- 
plication of genera or subgenera until the 
South American fauna is well known, when 
I believe their proper position can be ascer- 
tained. 
The peculiar genus Ctenarytaina is known 
at present to contain three species from New 
Zealand, two from Australia, one from the 
Lau Islands, and one from the Society Islands. 
The attachment of the type species to Fuchsia 
makes the question of its occurrence in South 
America an interesting possibility. Although 
the female genital segment of some of the 
species resembles that of some Australian 
genera placed in the Spondyliaspinae, the 
genus is left in the Psyllinae for the present, 
principally on the basis of the presence of the 
meracanthi. 
Genus Psylla Geoffroy 
The use of Psyllia by Ferris -and Klyver in 
accord with the opinion of E. P. Van Duzee is 
incorrect under the International Rules of 
Nomenclature; hence their species are here 
returned to Psylla. Five new species are added 
to the four previously known to occur in New 
Zealand. 
Psylla (Acizzia) acaciae Maskell 
1894 Psylla acaciae Maskell, Ent. Monthly 
Mag. 30: 171. 
1932 Psyllia acaciae Ferris and Klyver, New 
Zeal. Inst., Trans. 63: 50, pis. 12, 13, 16. 
This species has been adequately described 
and figured by Maskell and by Ferris and 
Klyver. It was taken from its host plant. 
Acacia melanoxylon R. Br., at Nelson, Septem- 
ber 19, and at the Forest Research Station, 
Whakarewarewa, December 4 and March 25. 
Psylla (Acizzia) conspicua n. sp. 
Fig, 1 
Length to tip of folded wings 2.75- 
3.25 mm. 
