OAT BEETLE. 115 



This tenth section, the third section of the division of 

 the Tetramera, includes — besides the Turnip Flea 

 Beetles, and some other kinds very like them, which 



Fig. 90.— Oat Beetle, nat. size and mag. ; 2, grub ; 3, cocoon. 



feed on Hop— the Mustard Beetles (Fig. 91, p. 116), 

 and others which feed (as the Oat Beetle) on the leaf- 

 age of various field or garden crops, or on trees.* 



We may know them, firstly, by their (apparently) 

 four-jointed feet ; and from the other two sets of 

 Beetles of this four-jointed division we may know 

 them by never having snouts like the Weevils, and by 

 (generally) not having long horns. They are com- 

 monly of small size, oval shape, and bright colour, 



* The attack of this Beetle may be known by the brownish slug-like 

 grub eating the skin of the leaf in lines, as shown in the figure. The 

 Beetle is not uncommon from spring to autumn on corn or rushes. 

 It is of a deep greenish blue, with reddish orange fore body, and some- 

 what less than a quarter of an inch long. See Curtis's ' Farm Insects,' 

 p. 307. 



