XII 



INSECTS OF THE SEA-SHORE 



375 



go daily immersion, and become motionless when 

 covered by water. 



Two European species of Aepus have been more 

 carefully studied than the rest of the marine Cara- 

 bidae. They run about on stones, sea-weed, sponges, 



Fig. 113. — Aepus Robinii. 



etc., at low water. Being like most other Carabidae, 

 incapable of flight, they cannot avoid the rising tide. 

 As soon as it reaches them, they creep under stones 

 and remain motionless. The body is flattened, and 

 covered in every part with hairs which entangle air 

 (Audouin). There is a large pair of air-sacs in the 



