INSECT ENEMIES OF EASTERN FORESTS 61 
A few marine forms injure woodwork in salt water and are discussed 
on pages 66-69. 
The consideration of these forms in relation to fish in our streams 
was very adequately treated by Needham (379). 
MILLIPEDES 
CLuass DIPLOPODA 
and 
t CENTIPEDES 
Ciass CHILOPODA 
Both the millipedes and the centipedes are very common arthropods 
and are worth brief mention, as they are found in the same associations 
as insects. Both forms are primarily outdoor creatures found under 
FIGuRE 2.—A large millipede, Spirobolus marginatus. About twice natural size. 
bark, stones, old boards, or damp rubbish. Many fears and super- 
stitions are built around these creatures. The millipedes are elongate 
slow-moving forms with two pairs of legs on each segment, and when 
disturbed they curl up as for protection (fig. 2). Under certain con- 
ditions some species of millipedes will swarm into camps, old build- 
ings, and residences. They feed on decaying vegetation. 
In contrast, the centipedes are elongate flattened forms, with one 
pair of strong legs on each segment, and are capable of very rapid 
locomotion. One species, the house centipede (Scutigera forceps 
Raf.) (fig. 3), is common around buildings, particularly in damp cel- 
lars and bathrooms. It feeds on insects and other small animals, and 
is provided with poison glands on the claws of the first pair of leglike 
appendages. The bite of this species is not severe on man, but that 
of some of the larger species is more painful. 
Millipedes in buildings can be readily controlled by poison baits, 
such as slices of raw potatoes or apples dusted with paris green. They 
