FIG. 46. Some Primitive Insects. 



A, ' Silver-Fish, 'Lepisma, found in kitchens. (After Buff on.} B, Campodea, 

 a small white antique insect found under stones. C, Sminthurus, a 

 member of the order Collembola, provided with a spring (a) and a 

 curious ventral gland (b). It occurs on grass, the surface of water, and 

 sometimes on tomato-houses. 



