26 
only to be brought into the immediate vicinity of a tobacco field to 
spread upon the crop, and under favorable conditions it may ocea- 
sionally do considerable damage. 
Plant lice——Several species of plant lice are known in Europe to 
occur occasionally upon tobacco, and several of our American species 
which affect solanaceous plants are liable at any time to be found 
upon tobacco. As a matter of fact, however, we have never known 
any especial damage to be done to tobacco by these insects. Late in 
the autumn of the present year the terminal leaves of the tobacco 
plants growing in the experimental plats of the Division of Entomol- 
ogy became covered with a plant louse known as Nectarophora tabaci 
Pergande. This species has been found by its deseriber, Mr. Per- 
gande, of the Division, during the last two years upon the leaves of 
young pear trees on the grounds of the Department of Agriculture, 
and also upon the leaves of apple, Rumex, Leucan- 
themum, and Forsythia, as well as tomato and egg- 
“lp, Plant. During the summer of 1898 the same spe- 
er OG es cies was received from Dr. F. P. Phelps, of Mount 
tris—natural size (af- Holly, Md., with the information that 5 acres of 
ter Binney). tomato plants were covered with countless mil- 
lions of these lice. The writer would not be at all 
surprised if in the near future considerable damage to tobacco by 
this species should be reported. 
The twelve-spotted Diabrotica, or ‘corn root-worm” ( Diabrotica 12-punc- 
tata).—In: Kentucky, according to Professor Garman, this small, 
greenish beetle, marked with twelve black spots, which is so common 
on cucumbers, squashes, melons, and other cucurbitaceous plants, is 
often found on tobacco leaves, eating small round holes. Its larvee 
feed on the roots of corn, and the beetle is only a casual visitor of the 
tobacco field. It can not be considered a dangerous insect by the 
tobacco grower. 
Slugs (Limax campestris Binney, and allied species).—Damage is 
occasionally done to young tobacco plants in seed beds by slugs. 
Specimens were received last summer from Dr. H. T. Fernald, the 
State zoologist of Pennsylvania, which he said had very seriously 
damaged some of the tobacco beds by eating the young leaves. These 
specimens were submitted to Dr. W. H. Dall, of the Smithsonian Insti- 
tution, who said that they were young and badly contracted, but prob- 
ably belonged to the species known as Limaax campestris Binney, which 
is shown by fig. 22. ; 

THE CIGARETTE BEETLE. 
(Lasioderma serricorne Fabr.) 
Of the insects injurious to cured tobacco none approach, in economic 
importance, the species which has become known as the cigarette 
beetle. The name ‘‘cigarette beetle” is more or less of a misnomer, 
since the insect not only feeds in all kinds of dried tobacco, and even 
in snuff, but also in many other substances, such as rhubarb, ginger, 
ot 
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