PORCELLIO. 235 



Tail abruptly narrower than the body ; its appendages are 

 four, the side ones being two-jointed. 



Philoscia Muscorum, Scop. — Body above ash-brown or 

 reddish, sprinkled with little dots and -marks of grey or 

 yellow, under side whitish. 



In damp places, as among the moss at the roots of trees. 



Gen. 120. POECELLIO, Latr. 



Outer antennas with seven joints, by which character it is 

 chiefly distinguished from Oniscus. In Scotland these crea- 

 tures are commonly called " Sclaters." Dr. Asa Fitch* has 

 well described the use of these common little Crustaceans. 

 He says that they are "everywhere common about the 

 roots of trees, under logs and stones, in the crevices of the 

 foundation walls of our buildiugs, and in our cellars ; and 

 they are particularly numerous under any logs or billets of 

 wood. They occur, in short, in all situations that are damp, 

 cool, and dark. Frequently by night, in wet weather, they 

 crawl about the rooms in our dwellings. They are perfectly 



* First Report on the Noxious, Beneficial, and other Insects of the State 

 of New York, p. 118. Albany, 1855. 



