About Poecilopompilus algidus
Poecilopompilus algidus measures between 13 and 28 mm in total length, with females typically larger than males. In some regions, this wasp is mostly black with a red spot located on its metasoma. Wasps in the genus Poecilopompilus are thought to be Müllerian mimics of other wasp species, and the variation in P. algidus appearance across its range occurs because it mimics other sympatric wasps that have painful stings. For example, in the southern part of its range, P. algidus resembles paper wasps of the genus Polistes, which makes it hard to tell apart from the related species Poecilopompilus interruptus. In the northern part of its range, this species mimics spider wasps of the genus Anoplius. To distinguish between P. algidus and P. interruptus, observers must examine the spines on the female front tarsi and the inner margin of the eyes. Female P. algidus have 3 strong spines on the front tarsi, and this species has convergent inner eye margins. In contrast, female P. interruptus have four weak spines on the front tarsi and parallel inner eye margins. This species is distributed from Ontario, south through the United States, Mexico, and Central America, all the way to Argentina. It prefers sandy, fossorial habitats, but can also be found in well-vegetated areas.
