1986] Heere, Windsor, and Foster— Wasps and ants 329 
Summary 
Twelve species of vespid wasps were found nesting on two species 
of melastomataceous ant plants in a mixed lowland forest near 
Iquitos, Peru. Although eight different species of ants inhabited 
different individual plants of Tococa guianensis (Melastomataceae), 
wasps only nested on those plants inhabited by the ant Allomerus 
octoarticulatus. Nests were also found on Maieta poeppigii 
(Melastomaceae) inhabited by Pheidole spp. Several Mischocyttarus 
species exhibited nest architectures atypical of the group. Observa- 
tions and manipulations indicate that by nesting on these ant plants 
inhabited by those particular ants the wasps avoid nest plundering 
by army ants. 
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