No. 145] 
739 
vated currant, but have found it upon our wild currant (Ribes 
floridum,) pretty numerous. Scales very similar to those of the 
Apple bark-louse, but of a smaller size, of a pale brownish color, 
and not curved, may be met wilh also upon the twigs of the but¬ 
ternut. Some of these are so small as to be imperceptible to the 
naked eye. As they are evidently a distinct species, I propose to 
name them the Butternut Bark-louse, Jispidiotus Juglandis. My 
friend Dr. A. S. Todd, of Wheeling, Virginia, has sent me speci¬ 
mens of another species of this same genus, occurring upon Rose 
bushes. He says : t( My finest roses are cursed with these ver¬ 
min. They kill ‘ for certain ’ every Rose bush they get upon. It 
dies to the ground.” This is a round, flattish, white scale, about 
five hundredths of an inch in diameter, often with a light yellow 
spot or cloud in its center. This is probably the Jispidiotus Roses 
of Bouche, (Schadl. Gart. Ins , p. 53,) which is briefly noticed in 
Kollar’s Treatise, English edition, page 179. 
The Apple Bark-louse is about one-eighth of an 'inch long, of 
an irregular ovoid form, often bent in its middle, and more or 
less curved at its smaller end, which is pointed, the opposite end 
being rounded.. If is of a brown color, of much the same tint 
with the bark, its smaller end being paler and yellow. 
It closely resembles an exceedingly minute oyster-shell 
piessed against the bark—a similitude so striking as to 
be readily perceived by every one, and is frequently 
designated in common conversation, under the name of 
the Oyster-shaped Bark-louse. These shells or scales are situa¬ 
ted irregularly, though the most of them are placed lengthwise 
. of the limb or twig, with the smaller end upwards. These scales 
are the relics of the bodies of the gravid females, covering and 
protecting their eggs. During the winter and spring, these eggs 
may be found, on elevating the scales. The number of eggs under 
each scale is very variable. Several which I have counted, have 
shown the following numbers—13, 22, 36, 54, 58,71,86,102. 
I have uniformly found a greater number of eggs where the scales 
were upon a thrifty tree. When a tree becomes overrun, so as 
to dwindle and not afford a copious supply of nourishment, the 
number of eggs is reduced. 
