1974] 
Alcock Cff Gamboa — Cerceris 
53 
Sleeping sites 
In the late afternoon, especially before impending storms, males 
were seen flying slowly along the large rose bush. The wasps eventu- 
ally alighted and walked under groups of tightly packed leaves and, 
in one case, into a tube formed by a rolled leaf, evidently in search 
of a sheltered sleeping site. One male (“red”) that had been marked 
on the morning of 27 July at a spot 50 m to the south of the rose 
bush was found by this plant at 1610 seeking a resting place before a 
thunderstorm. The next morning it had returned to the area where 
it had been marked indicating that some males may fly modest dis- 
tances from their home range in order to exploit a sleeping site. 
Fig. 2. A male Cerceris simplex perched on a rose leaf and resting 
between cruising flights about its home range. 
