84 
PACIFIC SCIENCE, Vol. VI, April, 1952 
the country which can assure proper care of 
such material. It is in accord with this view 
that these types are left in New Zealand. Un- 
fortunately this has been seldom done in the 
past. Therefore, present and future taxo- 
nomists in New Zealand face a tremendous 
difficulty. 
ACKNOWLEDGMENTS 
The number of those who have helped in 
one way or another in forwarding this work 
is very large, and space will not permit the 
complete listing of them here. My deepest 
appreciation is due Dr. E. A. Dennis and Mr. 
E. G. Budge of the U.S. Educational Foun- 
dation in New Zealand, who, from the time 
of the granting of the award until the com- 
pletion of the work, have assisted in many 
ways. The administrative officers of Victoria 
University College and Massey Agricultural 
College, collectively and individually, have 
been most helpful. To Dr. J. H. Tetley of the 
Department of Zoology, Massey Agricul- 
tural College, who not only assisted me in 
collecting, but whose anticipation of my 
needs in equipment and materials and whose 
assistance in many ways have contributed 
greatly to my efforts, I am most deeply grate- 
ful. Of those many persons who have 
assisted in the field work, I must mention 
with gratitude Dr. W. Cottier of the Plant 
Diseases Division, D.S.I.R.; Mr. G. B. 
Rawlings, Forest Experiment Station, Wha- 
karewarewa; Mr. L. J. Dumbleton, Mr. E. S. 
Gourlay, and Mr. A. W. Parrott, Cawthron 
Institute; Dr. R. A. Cumber, Phormium Re- 
search Station; Mr. R. R. Foster, Canterbury 
Museum; and Dr. T. E. Woodward, Auck- 
land University College, all of whom con- 
tributed much valuable information as well 
as specimens. Dr. John Salmon of Victoria 
University College was most helpful prior to 
his departure for England. To Mr. John 
Carnahan and Dr. J. S. Yeates of the Depart- 
ment of Botany, Massey Agricultural College; 
Miss P. A. Lush, Dominion Museum; and 
Miss J. M. Dingley, Plant Diseases Division, 
D.S.I.R., I express sincere appreciation for 
assistance in identification of plants. 
PROCEDURE 
As the only material available for study in 
any of the collections in New Zealand has 
consisted of a few vials of specimens, mostly 
nymphs, and a few fragments of MaskelLs 
material, it was necessary to collect the speci- 
mens for study. This is, of course, the ideal 
method, and it proved very pleasurable as well 
as fruitful. In making the collections, a heavy 
sweeping net and aspirator were used for 
capturing the adults and for general '"pros- 
pecting.” Once a population was located, an 
attempt was made to secure nymphs and to 
rear some of them to the adult state, thus 
making absolutely certain the identity of the 
host plant. In almost all cases, specimens of 
the host plant were taken and submitted to 
the botanists mentioned for identification. 
Some specimens of each collection have 
been mounted on card points. All the speci- 
mens mentioned were collected by myself 
during the season 1950-51, except where 
otherwise stated. 
For each species figured, specimens have 
been dissected, mounted in glycerin jelly, and 
examined under the dissecting and compound 
microscopes. 
The terminology used is that in general use 
by workers on the Psyllidae with a few possi- 
ble exceptions which are largely self-explan- 
atory. I have used the term "points” to indi- 
cate the minute sclerotizations on the mem- 
brane of the wings as this is more accurate 
than the term punctations, which was used 
by Ferris and Klyver. 
The names of localities in New Zealand 
have been taken from the maps of the New 
Zealand Automobile Association. 
DISCUSSION 
As is well known, the New Zealand flora 
shows many differences to the north or south 
of a line which falls approximately at the 
38th parallel. Unfortunately, the time spent 
