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OUR HOUSEHOLD INSECTS 



chief differences perceptible are in the region of the hinder 

 part of the thorax and the fore part of the abdomen. The 

 prothorax is very similar to that of the adult, the leaf -like 

 margins projecting by the sides of the head ; the next 

 two segments, however, have not become so specialised 

 as will ultimately be their fate, and they appear as 

 distinct bands right across the body. The first of them, 

 which is the meso-thorax, already shows, however, a slight 



FIG. 98. Bed-Bug at the Nymph Stage. 



indication, at the sides, of the outline of the fore wings. 

 The next three segments are very similar to one another, 

 and no distinct line of division shows where the thorax 

 ends and the abdomen commences. But if we remember 

 that the thorax consists in all of only three segments, 

 and that the first of these is the very distinctly marked 

 prothorax, the determination of the line of junction of 

 the chief regions of the body becomes easy. 



