80 LOWER PTERYGOTA 



They have enormous heads, strong jaws, and are especially 

 fitted for attacking enemies that may enter the colony. 

 They are, of course, helpless against larger kinds of animals, 



Fig. 41.— Termites and their work: a, adults working in the stem of 

 geranium (photograph by Wm, P. Beeching, Jr., Ohio Agric. Exp. Sta.); 

 b, enclosed gallery suspended from the underside of greenhouse bench 

 (photograph by J. L. King, Ohio Agric. Exp. Sta.). 



but their bite is very severe and they doubtless in this way 

 serve as very effective guards against a numerous host of 

 smaller-sized animals. 



