119 



quent loss of all the flowers. Hand-picking of the caterpillars 

 is a satisfactory method of control. Paris green applied as 

 a dust might be useful, but on account of the fact that a 

 great part of the feeding is done inside the buds, the action 

 of poisons is rather problematical. 



Roses and many other plants, especially the silk cotton 

 tree, are sometimes seen with the leaves very badly cut, 



small circular, or nearly circular, pieces being removed. 



This is the work of the leaf-cutting bees of which 

 Megachile martindaiei shown in the illustration (Fig. 134) 



is one. The pieces of leaf are used by the insects for lining 

 the interior of their cylindrical nests. 



