194 Transactions.—Zoology. 
The eggs, according to my observations, are usually from thirty to fifty in 
number, oval in shape, of a white or opaline colour, changing to yellow as 
spring comes on. 
The males of this species have yet to be discovered. 
I have often found amongst the eggs of Mytilaspis pomorum a minute 
white Acarus. It is to be hoped that it feeds largely on the eggs. 
Several cures for this pest of the apple tree have, I believe, been tried. 
Mr. A. Carrick, of Park Terrace, showed me last year a tree of his which he 
had painted over with a mixture of kerósene and linseed oil. Inspection 
of the puparia showed that the fluid had thoroughly penetrated them and 
surrounded the eggs ; and I understand that the cure has been complete. 
Mytilaspis pomorum attacks in this country the pear and plum trees as 
well as the apple. Indeed, I have found specimens identical in almost every 
respect on the following trees :—plum, peach, apricot, pear, lilac, cotone- 
aster, thorn, sycamore, ash, and many others. That these are all the 
same or different species, I do not like to affirm. Yet in the numbers of 
their spinnerets they differ. M. Signoret states that in Europe Mytilaspis 
pomorum is found only accidentally on the pear tree, sometimes on the 
plum; and he names scarcely any other trees. Here all those which I 
mentioned appear to be indiscrimately attacked by them. The scale on the 
ash is perhaps a little smaller. I give, however, as an indication for com- 
parison the spinnerets of insects on a few of these trees :— 
— Upp & Groups. Upper side Groups. Lower side Groups. 
Apple 17 17 14 
Plum ` 20 17 17 
tiae 22 ee 17 19 16 
Ash 10 12 9 
Cotoneaster .. .. 4 15 10 
2. Mytilaspis pyriformis, sp. nov. 
Plate V., fig. 8. 
The puparium is broadly pearshaped, the discarded tests occupying the 
smaller end ; the tests are of a pretty regular oval shape ; the pellicle of the 
second stage reaches to about the middle of the puparium. Colour of 
shield light brown ; texture thinner than in Mytilaspis pomorum, and form 
flatter ; length about ji inch; greatest breadth about j inch. Plate V., 
fig. 8a, shows the appearance of the puparium. 
This species in the shape of its shield and a few other partieulars 
resembles Mytilaspis buwi of Bouché; but there are differences which 
authorise me, I believe, in considering it as new, 
