150 The Philippine Journal of Science 1920 
male, but this is lacking in Icerya jacobsoni Green among those 
found in the Philippines. This species is evidently closely re- 
lated to Icerya in its other characters, however, and, pending a 
revision of the genera of this subfamily, it is preferable to leave 
it here. In addition to the development of the ovisac, the Phil- 
ippine species of the genus have 10- or 11-segmented antennae 
in the adult female; three pairs of abdominal spiracles in all 
species except I. purchasi, which has two; and a more or less 
definite band of glands and hairs ventrally for secreting the 
ovisac. 
Key to the Philippine species of Icerya. 
a 1 . Antenna 10-segmented in adult female; without ovisac; with at least 
two types of gland pores, some, in clusters along the body margin, 
large, with trilocular centers and a projecting tongue. 
I. jacobsoni Green. 
a 3 . Antenna 11-segmented and ovisac developed in adult female; without 
gland pores with trilocular centers. 
6 1 . Derm gland pores of two types, one smaller, varying in size and 
arrangement, with solid center, the other much larger, ringlike, 
with large open center; marginal wax filaments of body not very 
long, dorsal secretion with numerous glassy threads through it. 
&. With two pairs of abdominal spiracles; large open center gland 
pores along body margin only; body hairs numerous, conspicu- 
ously black; ovisac fluted I. purchasi Mask. 
c 1 . With three pairs of abdominal spiracles; large open center gland 
pores present on both dorsum and margins of body; body hairs 
dark reddish, not conspicuously black; ovisac smooth. 
I. seychellarum (Westw.). 
h ’. Derm gland pores of different sizes, but none so large as in preceding 
species, all with solid centers; body with a number of long, twisted, 
lateral and caudal filaments I. aegyptiaca (Dougl.). 
Icerya jacobsoni Green. 
Icerya jacobsoni Green, Robinson, Philip. Journ. Sci. § D 12 (1917) 2. 
I have seen some of the material on which Miss Robinson 
based her record, and in addition have examined specimens 
collected at Los Banos, Laguna Province, on Litsea glutinosa, 
December 11, 1917 ( Banks 18353 ) and at the same place on 
Psidium gwajava, January, 1919 ( Baker 10098). The speci- 
mens from Banks were as much as 9 millimeters long. The 
figure copied by Miss Robinson and the accompanying drawings 
of the structural details of the species should make it readily 
recognizable. 
