In myrmecology, a solarium is an earthen structure constructed by certain members of the Formicidae for the purpose of brood incubation. Solaria are usually dome-shaped and fashioned from a paper-thin layer of soil, connected to the main nest by way of subterranean runs.
Tapinoma erraticum is an example of a solaria-constructing species whose skill at so doing was noted by Horace Donisthorpe in the early 20th century in his book British Ants, their Life Histories and Classification.
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