INSECT ENEMIES OF EASTERN FORESTS 65 
cles attack birds, especially those that live on the ground, such as 
quail, and others attack domestic animals, causing considerable eco- 
nomic loss. 
Control and preventive measures for the common dog tick which 
transmits Rocky Mountain spotted fever were discussed by Bisho} pp 
(30). More recently DDT sprays have been used effectively. Dail 
removal of the ticks from dogs, which bring them into houses, is im- 
portant. Ticks can be prevented from attaching to dogs by dusting 
a little derris powder into the hair. When a person w: alks in the woods 
during tick season, suitable clothing should be worn to keep the ticks 
from reaching the skin, and one’s body should be carefully zal ted at 
least twiceaday. A preventive vaccine for the fever virus has been 
developed by the United States Public Health Service. 
THE RED SPIDERS 
Famity TETRANYCHIDAE 
Several species of red spiders are important pests of plants. They 
are minute (0.5 mm.), oval, eight-legged animals, covered with long 
hairs and having sucking mouth parts. They are scarcely visible to 
the naked eye except as they move about. Most species are of a red- 
dish color, tinged with green or yellow. They are more readily recog- 
nized by their injury, which for the more common forms consists of 
a mottled brownish or rusty discoloration of the leaves (fig. 5, A), 
the surfaces of which are usually covered with a very fine matting of 
silk threads, and spotted with tiny spherical eggs or broken eggshells 
(fig. 5,8.) They become abundant during hot weather and are par- 
ticularly damaging during periods of drought, as discussed by Gar- 
Figure 5.—The southern red mite (Paratetranychus ilicis McG.) : A, Damage to 
hemlock leaves by red spiders; B, eggs, greatly enlarged. 
