There is a great variety of this insect in Ceylon, from the large
black species, the size of the hornet down to the minute
tinsel-green fly, no bigger than a gnat; but every one of these
different species wages perpetual war against the arch enemy of
flies.
In very dry weather in some districts, when most pools and
water-holes are dried up, a pail of water thrown upon the ground
will as assuredly attract a host of mason-flies as carrion will
bring together "blow-flies." They will be then seen in excessive
activity upon the wet earth, forming balls of mud, by rolling the
earth between their fore feet until they have manufactured each a
pill. With this they fly away to build their nest, and
immediately return for a further supply.
The arrangement of the nest is a matter of much consideration, as
the shape depends entirely upon the locality in which it is
built: it may be in the corner of a room, or in a hole in a wall,
or in the hollow of a bamboo; but wherever it is, the principle
is the same, although the shape of the nest may vary. Everything
is to be hermetically sealed.
The mason-fly commences by flattening the first pill of clay upon
the intended site (say the corner of a room); she then spreads it
in a thin layer over a surface of about two inches, and retires
for another ball of clay.
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