350 LAMPKEYS. 



in front of oesophagus; mandibulary plate nearly straight, 

 with about eight sub-equal teeth; a few scattering teeth 

 on sides of mouth; snout rounded; dark blue black, un- 

 spotted, silvery below; L. 8 to 11. Great Lakes, Upper 

 Miss, and Ohio Valley, abundant in many localities, 

 ascending small brooks in the spring. 



