74 ANIMAL BIOLOGY 



and streams and the adults usually fly near the water. 

 Another insect of somewhat similar habits is the large 

 dobson fly, Corydalus, which reaches a length of 4.5 

 inches. The males have remarkably long slender man- 

 dibles. The large larva (dobson or hellgrammite) is 

 much prized as bait. 



