Q4 DYTISCUS. 



Many other much smaller species of this genus 

 may be found in ponds and slow-running waters. 

 Mr. Marsham, in his Entornologia Britanniea, 

 enumerates not less than forty-nine British Dy- 

 tisci; so rapid has been the increase of entomolo- 

 gical discovery within these few years past ! 



