THE
DIGGER
47
WASP
The length of the females was between 10mm. and 15mm., usually about 13mm. EXCAVATION
OF
BURROWS
Each of three nesting holes was used by more than orte individual, the numbers seven, four and three. The entrance holes and main burrows measured 7mm. across, the excavating appeared to be carried out mainly at night and during spells of dull and cold weather, rarely in bright sunshine. The main burrow, used by the seven mentioned above, was 27 inches in length and continued deeper into the interior where the wood was harder. Only two side burrows with cells were found in this length. The main burrows of the solitary ones, varied in length from nine to 14 inches, the lateral ones were also of various lengths, each ending with a cell, which was sealed by the wasp Alling the entire length with excavated material. In one nest consisting of five cells four were examined ; these were sealed and contained four flies each, but no eggs could be found upon them.
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CfiL-lf.- ^ Catititunin f>y-<Lstvi In addition to the details shown in diagram, two other stored and sealed cells were found in different nests. One was stored with four Orthellia cornicina, the other with four Catabomba pyrastri.
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