670 The Philippine Journal of Science 1921 
and slenderer than in adult, broadly rounded anteriorly, acutely 
pointed posteriorly, terminating in a long seta measuring about 
182 », the plates themselves about 53 » long; anal ring apparently 
with only four rather long setz, this not definitely determinable. 
. Male puparium.—Of thin transparent wax, also slightly asym- 
metrical, about 2.25 millimeters long and 0.9 wide, flat dorsally, 
with a pair of longitudinal lines running cephalad from the 
anal plate region close together and diverging near the cephalic 
end of the body after being united by a single transverse line; 
with a pair of transverse lines running to the body margin on 
each side, posterior to the median transverse line. 
This species has been described from seven specimens mounted 
on slides, and about twenty-five specimens on or detached from 
the host, all from the undersides of the leaves of Pinanga, 
Government Hill, Singapore, August, 1917, collected by I. H. 
Burkill (Baker 8942). The types are in the United States 
National collection of Coccide. 
The conspicuously asymmetrical character of all the stages of 
this species, except the young larva, is quite probably due to the 
method of attachment of the insect close to one of the deep, but 
narrow, riblike veins of the host leaf, but this characteristic is 
constant and pronounced in every specimen examined. 
Three species are now known to belong in the genus Platyle- 
canium—the type, P. eribrigerum (Cockerell and Robinson), 
P. pseudexpansum (Green), and the species just described ; 
all agree in being flat with a very thin film of dorsal 
secretion, in having reduced .antenne, no legs, marginal sete 
minute, simple, well separated, spiracular spines cylindrical or 
slightly tapering, in groups of three, set in deep incisions opposite 
each spiracle, diamond-shaped anal plates bearing minute sete, 
anal ring with six sete and a dorsal semicircular row of “cribri- 
form plates,” three on each side of the anal plates. The most- 
nearly related genus known to me is Paralecanium Cockerell, 
which is definitely differentiated from the genus under dis- 
cussion only by the modification of the marginal sete to form 
broadly expanded and flattened, closely set, usually circular or 
oval, striate flabellee. The more conspicuous differences between 
the adult females of the three species included in Platylecanium - 
are indicated in the following key. This cannot be considered 
final, on account of lack of specimens of the genotype, only a 
small portion of one specimen being available for examination, 
and indeed it is possible that the new species described here is 
actually cribrigerum (Cockerell and Robinson), and that the 
