288 OUR HOUSEHOLD INSECTS 



there are differences in the form of the terminal segments. 

 In most of the field-bugs the abdomen is rather widely 

 bordered on each side by a flat margin, distinctly marked 

 off from the rest of the body. In the bed-bug, however, 

 this margin, which is called the connexivum, is reduced 

 to an exceedingly narrow line, and is scarcely per- 

 ceptible. 



Turning the bug over on its back, we now proceed to 

 examine the under side. The chief point to be noticed 

 here is the position and attachment of the legs. They 

 are all let into hollows in the thorax as usual by the 



FIG. 94. Under side of Thorax of Bed-Bug, c,vc,, 'e,,, coxse of ist, 2nd, and 

 3rd pairs of legs ; I, I,, l ul ist, 2nd, and 3rd pairs of legs ; s, flap under 

 which the scent-glands lie. 



coxae (Fig. 94). The coxse of the first pair are almost 

 close together, there being only room for the tip of the 

 rostrum between them, but the other two pairs are 

 separated by a considerable interval, and the space 

 between them is occupied by a raised surface covering 



