92 POPULAR ENTOMOLOGY. 



COLEOPTEEA. GtEINID^. 



GYEINUS. 



Generic Distinctions. — Antenna short and thick, fonning a 

 mass, almost like ears; head sunk in the thorax; hinder legs 

 veiy short, compressed, and haiiy ; fore legs long ; body highly 

 polished. 



Gyrinus natator. (Plate I.) Nearly three lines long, of 

 an ovate form, blue-black in colour, with a metallic lustre, 

 the breast rather red ; found in water. 



COLEOPTERA. DtTICID^. 



DYTICUS. 



Generic Distinctions. — Antennce eleven-jointed and setaceous ; 

 head thick, and partly sunk in the thorax ; elytra in some species 

 destitute of furrows in the males ; hody oval ; colour black, 

 tinged with olive ; size large. 



Dyticus marginalis has the body blackish-green above, 

 yellowish-blown below, the thorax and elytra margined with 

 yellow. The female is furrowed; it is about an inch in 

 length. 



