115 
L tried the experiment of applying pyrethrum for the destruction of 
die insect. A large branch was dusted with a mixture of one part 
pyrethrum to ten of flour, at 9:30 a. m., July 4, and soon after 
die lice began falling from the twigs. At 6 p. m. only a few re¬ 
mained, and by 8 a. m. of the second day thereafter all had fallen 
off and were lying dead upon the table. Spraying the foliage of 
these trees with water in which pyrethrum was suspended in the 
proportion of about a tablespoonful to a gallon of water would, con¬ 
sequently, in all probability, destroy the lice, or at least so effectu¬ 
ally check their multiplication as to prevent injury to the trees. 
gf, 
3. An Elm Bark Louse. 
( Lecanium, sp.) 
Order Hemiptera. Family Coccnx®. 
On the twigs of the white elm, at Normal, we found, this last season, 
a large brown bark louse very similar in size, shape and general 
appearance to the maple Pulvinaria previous to the appearance, of 
the cottony egg mass beneath the body of the female, but differing 
especially in the fact that the eggs were not enclosed in the waxy 
filamentous masses or nests characteristic of Pulvinaria. 
As we obtained only the adult female, we had not the material 
for determining or describing the species. The matured scales aie 
nearly circular, 5 mm. in diameter, vaulted, emarginate before and 
behind, the upper surface more or less shining, dark brown, irregu¬ 
larly pitted on the central area, (where, however, it is nearly smooth), 
and deeply and irregularly punctured on the sides,—below the punc¬ 
tures irregularly rugose. The eggs are oval, .099 mm. in length by 
.048 mm. in transverse diameter. Beneath females obtained July 
2, were eggs in various stages of development, young which had just 
hatched, and those which had just passed the first moult. 
4. The Three-Banded Leaf Hopper. 
(Typhlocyba tricincta, Fitch.) 
Order Hemiptera. Family Coccid^e. 
About the middle of June, this pale yellow leaf hopper, distin¬ 
guished by two transverse dusky bands, (one across the nil i e 
and one at the tips of the wing covers), and a dusky cloud upon 
the scutellum, was abundant enough upon the leaves ol the 
white elm, at Normal, to do considerable damage. 1 his species, e- 
scribed by Fitch in his Third Report as State Entomologist of New 
York, (p. 74), was originally found by him, in abundance, on rasp- 
berry and currant bushes, and on grape vines. 
