106 First Report on Economic Zoology. 
that do harm, viz., Oniscus asellus, Linn., and Armadillidium vulgare , 
Lat. Oniscus asellus is omnivorous, but does much harm in hot-houses 
and to soft wall-fruit ; it also eats away at strawberry roots. This species 
rolls itself up into a ball and can be told from the Armadillidium and 
Porcellio by having eight-jointed antennm, the two latter having seven- 
jointed ones. 
Armadillidium vulgare is larger and of a uniform slaty blue and rolls 
itself up very readily. 
Porcellio scaler is brown, much variegated in colour, with a rough 
shell and two long spines behind. 
Probably they have been spread in the manure from the heap you 
refer to. 
You might cover the manure heap with lime — gas lime (hot) in 
preference — but it must be left on the heap for some four weeks before it is 
put on the land. I should put a layer an inch thick of gas lime over the 
heap and let it stand for some time. 
Woodlice may easily be trapped along borders by putting here and 
there pots filled with moss and horse dung. They can be collected in the 
day-time and so destroyed. 
Many plants are harmed by these pests ; as a rule the harder the leaf 
the more the plant escapes. 
There are some twenty species of Woodlice found in Great Britain. 
These land isopoda are included in twelve genera. They may mostly 
be found under moss, decaying wood, and leaves, both out-of-doors and in 
greenhouses. Some few, such as Ligia oceanica, Linnsnus, and Philoscia 
Couchii, Kinahan, seem to be partial to the neighbourhood of the sea. 
A New Phytoptid Disease in Violas. 
Quite a new disease in violas lias been reported by Mr. Charles J. 
Gleed, of Cliveden Gardens, Maidenhead. The specimens sent had 
most of the leaves curled tightly over at each side and were quite 
hopelessly deformed. 
Mr. Gleed wrote that he “ thought it was the cold weather ; but 
the attack is not general, two or three plants here and there, about 
30 per cent, of the plants and both young stuff struck this spring, 
and old plants off which cuttings have been taken, are attacked 
indiscriminately.” 
At first sight one would say the damage was due to Diplosis 
violicolct — the Violet Gall-Midge described by Mr. Chittenden * and 
excellently figured — but an examination soon revealed the real cause 
of the disease. There were found in all the leaves examined a 
number of short, thick green phytopti which seemed especially to 
congregate towards the apex of the leaves. As many as fifty of this 
large species were counted in one leaf. It is larger than the Currant 
* “ Some Insects injurious to the Violet, Pose, and other Ornamental Plants,” 
Bull. 27 (n.s.), U.S. Dep. of Agriculture, 1901, p. 47. 
