11 
former occurs on sugar cane, the latter on yams, and I have not the 
least doubt that they were both introduced from the tropics of the Old 
World, though they have not yet been detected there. In certain fea- 
tures, and strikingly in the peculiar iight purplish-brown tint of the 
Seale, they are recalled by the Cey- 
lonese A. trilobitiformis, which, how- 
ever, departs more than they do from 
typical Aspidiotus. I am inclined to 
suppose that these resemblances indi- 
cate some real affinity. 
We therefore dismiss Aspidiotus s. 
. str. as not American. In the Old 
A.“ eqanophglii re World it is quite abundant; espe- 
eR Ras ener cially, it would seem, in the warmer 
me ive ee ene parts of the temperate zone. Just 
‘ how many species are known can 
not be stated, since several of those described are more or less ques- 
tionable, either as to their validity or their position. There would seem 
to be about a dozen in Europe. 
DIASPIDIOTUS ‘Berl. and Leon.) Ckll. 
This subgenus was founded by Berlese and Leonardi for a mixture of 
species belonging to different groups. No type is designated, but A. 
ancylus is included, and may be taken as the type. This is the group 
in which the scale is usually dark-colored; the exuvire are covered; 
the median lobes of the female are usually quite close together and 
much larger than the others, and there are between the lobes “inei- 
sions, with thickened edges.” This is a cireumpolar subgenus of the 
north temperate zone, living mostly on deciduous trees. Its food- 
plants and range coincide 
to a great extent with the wi NAN \W 
a aie NN ‘\ y ai 
subgenus Hulecanium of Le- RAGIN \\ [ 
. \\ \\A \ >) \ 
canium. ; i ahd 
a \ } te) we () 
In America this subgenus 
has several known species, 
and no doubt several await ¥ 
discovery. As we enter the ih 
tropics it almost disappears, a =f 
or is replaced by the modi- | 
fied type Hemiberlesia; but /! = 
in the West Indian region = A sae 
are two convex species which 
must be referred to-Diaspi- 
diotus—A. punice and A, diffinis. It is unfortunate that we know so 
little of the coccide of the south temperate zone of the New World, but 
in Chile is found at least one native Aspidiotus, A. latastei, which must 
be regarded as a much modified Diaspidiotus. 
FiG. 8.—A spidiotus trilobitiformis (original). 
