34 Psyche [Mar - 
unsavory habitats and scavenger habits, might be con- 
cerned in the transmission of disease. From most mod- 
ern dwellings the sowbug is usually excluded; but roralis, 
its intimate associate, passes all ordinary barriers and 
may penetrate to all the rooms of human dwellings. 
Should the suspicion against the sowbug be substantiated, 
then roralis too may be recognized as a potential source 
of danger. 
