Genera and Species of Coccide. 135 
For the present I propose to cénsider only the first of these, 
leaving the others for future enquiry. This group may be 
said to include the following forms reported up to the present 
by various authors in different countries :— 
. Planchonia (Pollinia) coste, 'Targioni. 
(Asterolecanium) aurea, Boisduval. 
) quercicola, Bouché. 
) bambuse, Boisduval. 
jimbriata, Boyer de Fonscolombe. 
arabidis, Lichtenstein. 
— hedere, Lichtenstein. 
—— epacridis, Maskell. 
— styphelie, Maskell. 
——. (Lecaniodiaspis) sardoa, Targioni. 
11. —— oncidit, Cockerell. 
12. —— pustulans, Cockerell. 
13. —— (Lecaniodiaspis) yucce, Riley. 
14, —— (Asterolecantum) massalongiana, Targioni. 
ventruosa, Maskell. 
Three of the foregoing—P. arabidis, P. hedere, and 
P. yucce—have never yet, so far as I am aware, been fully 
described, and cannot be included in our consideration on 
that account. I do not, however, think it probable that they 
will be found to depart in any important manner from the 
type. 
I am not acquainted with P. massalongiana. 
During the last summer (in February 1895) I received 
from Mr. R. J. Kingsley some twigs of oak trees thickly 
covered with thousands of insects, which I at once recognized 
as a species of Planchonia. I was informed that they are 
doing great damage to oaks near Nelson, in this colony, and 
I have heard subsequently that they have been noticed there 
for twelve or fourteen years. I found that these insects, both 
in their tests and in their anatomical characters, corresponded 
exactly with specimens which had been sent to me of Plan- 
chonia quercicola, Bouché, by Dr. Signoret about 1880. ‘The 
occurrence of this species here in such numbers led me to look 
more closely still into the relationships of the genus Plan- 
chonia, and to cast about to find, if possible, some character 
which would be better adapted for proper discrimination than 
the mere outward appearance or colours of the test and the 
fringe. As regards the test, several writers have laid stress 
upon the differences which they have detected between 
“yellow” and ‘‘ green” or “ yellowish”? and “ greenish.” 
I have found it many times very difficult to satisfy myself 
(although not in the least colour-blind) as to what specimens 
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