250 TRANSFORMATIONS OF INSECTS. 
sack; this being done, the opening in the earth is filled up, and no 
trace, of it is'left: 
These bees are represented in the engraving, some flying, 
some cutting pieces of red poppy, and others are either upon the 
ground or entering a nest. 
The Carpenter Bee (A y/ocopa violacea), which is not uncommon, 
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Xylocopa violaced. 
is larger than the largest humble bee, and may be known by its 
velvéty black body and violet-coloured wings. This large bee, 
when about to construct its nest, searches for pieces of wood which 
it can pierce without much difficulty ; then it sets to work and 
enaws away with its mandibles and makes a hole, working indus- 
