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The nesting behaviour of the solitary wasp Tachysphex inconspicuus (Kirby) was comparatively studied based on observations made in two environmentally distinct locations in southeast Brazil: upper portions of two sandy beaches and a dirt road in a forested area. Motor patterns related to nest construction were similar in all observed wasps, but some behavioural features, which were different among the observed wasps in the two environments, seem to be constrained by ecological factors. T. inconspicuus can be behaviourally differentiated from several other species of the genus by the following combination of features: they close the nest temporarily during its provision, do not let the excavated sand to form into a mound in front of the nest entrance, construct unicellular nests, and provision the nest with cockroaches. Moreover, females T. inscospicuus use their hind legs in a peculiar way to manipulate the prey, which allows them to associate the use of the mandibles in prey transport with the possibility of excavating the temporary plug and entering the nest without releasing the prey. Chorisoneura lopesi Albuquerque, C. excelsa Albuquerque &amp; Silva, and unidentified species of Riatia (Blattodea: Blatellidae) were found as prey and Amobia floridensis (Towsend) (Diptera: Sarcophagidae) as parasitoid of T. insconspicuus.

Comparative study of the nesting behaviour of Tachysphex inconspicuus (Kirby) (Hymenoptera: Crabronidae) in two locations in southeast Brazil