122 
PACIFIC SCIENCE, VoL VI, April, 1952 
Fig. 31. Trioza adventicia n. sp. a. Lateral aspect of 
female cauda; b, lateral aspect of male cauda; c, caudal 
aspect of claspers. 
scarcely over 0.5 as long as forewing, set 
throughout with points. Metatibiae with 
single basal tooth, 1 outer and 2 inner apical 
spines. Metacoxae slightly raised anteriorly, 
not spiniform, meracanthi prominent. 
Male genitalia small. Proctiger short, 
broad in lateral view. Forceps very short; in 
lateral view broad basally, evenly narrowed, 
apically turned caudad to sharp tip; in caudal 
view stout, roundly truncate apically to blunt 
black mesal tooth. Female genital segment 
short; dorsal valve steep to blunt tip; ventral 
valve very short, truncate. 
HOLOTYPE, male, allotype, female, numer- 
ous paratypes, nymphs and eggs taken from 
plants of Acmena floribunda in Nelson, Sep- 
tember 19, October 20, and March 7. The 
feeding of the nymphs on the young leaves 
causes small pits, rolling of the leaf edges, 
and discoloration as described by Froggatt in 
infestations of T. eugeniae in Australia (Frog- 
gatt, 1901: 284. 
HOST PLANT: Acwiena floribunda D. C. [Eu- 
genia floribunda]. 
This species is apparently an immigrant 
probably with its host. What its original home 
may be is problematical. It belongs with the 
group of species which Crawford segregated 
as Megatrioza. It resembles T. curta (Ferris and 
Klyver) and T. eugeniae Froggatt. It is readily 
distinguished from both by the presence of 
only 2 inner apical spines on the metatibiae. 
I have examined the type specimens of T. 
eugeniae Froggatt and find, as expected, that 
his statement that there are stout spines on 
the protibiae is an error; they are on the meta- 
tibiae as in other members of the genus, one 
on the outer and three on the inner margins. 
Trioza curta (Ferris and Klyver) 
1932 P owe Ilia curta Ferris and Klyver, New 
Zeal. Inst., Trans. 63: 38, 39, 45, pis. 8, 10. 
Specimens of this species were taken in 
abundance (all stages) from young sprouts of 
pohutukawa on Rangitoto Island, September 
30, 1950. Specimens are also in the Plant 
Diseases Division Collection, same locality, 
April 30, 1945 , M. W. Carter. It is undoubted- 
ly common throughout the range of its host 
but seems to be limited to the young, tender 
foliage as none was found on older leaves 
although the pits formed by the feeding of 
the nymphs are common thereon. 
In general structure and appearance this 
and the preceding species are very similar. 
They fall into the group of species which 
Crawford segregated as Megatrioza, based on 
a series of characters not one of which will 
hold for the entire group. Most of the species 
which have been variously referred to Mega- 
trioza undoubtedly constitute a natural group, 
but I do not feel it is worthy of generic status. 
It may properly be considered a subgenus. 
Additional notes on the species: 
Length to tip of folded wings 3 mm. 
Head wider than mesoscutum. Pronotum 
long, not depressed. Membrane of forewings 
with minute points in small basal area. First 
abdominal tergite with covering of powdery 
wax. Metatibiae with 1 outer and 3 inner 
apical spines. Metacoxae somewhat raised 
anteriorly, not spiniform. 
HOST PLANT: Metrosideros excelsa Soland. 
