Fig. 20.--_Megachile maritima Kirby_: female; burrows in the ground,
makes its cells of pieces of leaves, which it cuts out with its
mandibles; host of _Coelioxys conoidea_.
Figs. 21, 22. _Coelioxys conoidea Illig_: male and female; cuckoo of
_Megachile maritima_.
Fig. 23. Burrows of _Megachile Willughbiella Kirby_, in a piece of
rotten willow; each burrow originally contained six cells, but two of
the left-hand series have been lost.
{xiii}