Bed Bugs as a whole are preeminently creatures of the land and the air. This is shown not only by the possession of wings by a vast majority of the class, but by the mode of breathing to which reference has already been made (p. 2), a system of branching air-tubes carrying atmospheric air with its combustion-supporting oxygen to all the bed bug"s tissues. The air gains access to these tubes through a number of paired air-holes or spiracles, arranged segmentally in series.