OF THE FARM AND GARDEN. 245 



polished and of a purer white color, and in the distinct 

 heart-shaped swelling above the vent (fig. 149, d). To- 

 wards the latter part of June we have found this larva 

 in abundance, in company with the pupa (fig. 149, b), in 

 rotten stumps and roots of the Pear. In preparing for 

 the pupa state, the larva forms a rather unsubstantial 

 cocoon of its own excrement, mixed with the surround- 

 ing wood. The pupa state lasts but from eight to ten 

 days, and the beetle (fig. 149, c), is found on our vines 

 during the months of July, August, and September. It 

 is not yet known how long a time is required for the de- 

 velopment of the larva, but from analogy we may infer 

 that the insect lives in that state upwards of three years. 

 This beetle was named about a century ago by Linnseus, 

 who met with a specimen in the magnificent collection 

 of shells and insects belonging to Queen Louise Ulrica of 

 Sweden. It occurs throughout the States and Upper 

 Canada, and is even met with in the West Indies. It 

 flies and feeds by day. The wing-covers are of a slightly 

 metallic clay-yellow color, with three distinct black spots 

 on each, and the wings themselves are dark-brown inclin- 

 ing to black; the thorax is usually a little darker than 

 the wing-covers, with one spot each side; the abdomen 

 beneath, and legs, are of a bronzed-green. It is easily 

 kept in check by hand-picking. 



THE ROSE-BUG, OR ROSE-CHAFER. 

 (Macrodactylus subspinosus, Fabr.) 



This insect does its injurious work in the beetle state. 

 The larva develops under ground. The following ac- 

 count is condensed from the standard work of Harris. 

 In arranging insects according to the plants to which 

 they are injurious, it is difficult to decide where to place 

 this; if we take into account the pecuniary loss it causes. 



