NEW RECORDS AND SPECIES OF PSYLLIDAE FROM THE 
PHILIPPINE ISLANDS, WITH DESCRIPTIONS OF 
SOME PREADULT STAGES AND HABITS 
By LEoPotpo B. UICHANCO 
Of the College of Agriculture, University of the Philippines, 
_ Los Banos, P. I. 
FIVE PLATES 
The present paper is based largely on the materials I collected 
while working with Philippine plant galls from Mount Maquiling 
and the neighboring plains. Prof. Charles S. Banks and the 
students in economic entomology at the College of Agriculture, 
University of the Philippines, also contributed a number of 
specimens. 
I have made an effort to follow throughout my paper the 
classification which has been so carefully worked out during 
the past seven or eight years by Prof. D. L. Crawford, now 
of the College of Hawaii, Honolulu, to whom our knowledge of 
this interesting family of insects is largely due. The terminol- 
ogy adopted for designating the various morphological parts 
used in classification is that discussed in Crawford’s monograph 
(Crawford ’14). 
The galls of five of the insects treated in the present work have 
been described in an earlier paper (Uichanco ’19). The charac- 
ter of these galls differs with the causative insect, and ranges 
from a simple convolution or depression in leaf lamina to very 
highly specialized and extraordinarily complex, well-defined 
formations. There are also species which are not gall-makers. 
The study of the immature stages of these insects has been 
practically neglected, although it seems to be a most promising 
field from both the biologic and the taxonomic points of view. 
The habits of the nymphs, especially as to formation or non- 
formation of galls and the general characters of galls formed, 
are apparently uniformly similar for certain groups. Like- 
wise, a number of distinctive taxonomic characters, such as 
* Contributions from the Bussey Institution for Research in Applied Bio- 
logy, Harvard University, No. 172. 259 
