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Southern Mexico to Costa Rica. Costa Rica: Atlantic lowlands.
Brown and Wilson (1959) summarize the genus as follows:
"Widespread in tropics and warm temperate areas. Primarily forest-dwelling; some species occur in grassland and arid scrub. ... Nests mostly in soil and rotting wood; a few species live in arboreal plant cavities in tropical rain forest. Foraging hypogaeic to epigaeic-arboreal. Food: most species are collembolan feeders; a few are polyphagous predators or occasionally feed on sugary substances..."
Members of the genus are all predaceous, with a kinetic mode of attack (Bolton 1999).
Brown (1962) reports that ludia is a forest species and usually nests in rotten branches or twigs lying on the forest floor. He also reports that the food is chiefly entomobryoid Collembola.
In Costa Rica, ludia occurs in young second growth habitats, and not in samples from mature forest. Thus, this species may be associated with synanthropic habitats. However, in the range further north it is abundant in Winkler samples from mature forest.
In addition to regular queens there are ergatoid queens that are more robust than workers, with a more developed petiolar node, and with a trio of minute ocelli.
Apical fork of mandible with one intercalary tooth; mandible with no preapical teeth; petiole with node only feebly differentiated from its anterior peduncle; gastral hairs mostly stiff, spatulate. Also see Bolton (2000:528).
Head length 0.67-0.74mm, mandible length 0.49-0.56, CI 81-84, MI 73-76 (n=9 workers from 6 localities; Brown 1962).
Brown's (1954 "1953") concept of S. ludia included forms 1 and 2, based on the range of measurements he reported. Brown's concept also included the junior synonym S. ludia tenuis Weber, 1934. Mann described S. ludia from "Cecilia," Honduras. From the context of the publication, this must have been a site in the lowlands or foothills along the Atlantic coast. Weber's tenuis is from Nicaragua, Tuli Creek, near San Miguel. Both are sites in which forms 1 or 2 could occur, so types should be examined.
Bolton, B. 1999. Ant genera of the tribe Dacetonini (Hymenoptera: Formicidae). J. Nat. Hist. 33:1639-1689.
Bolton, B. 2000. The ant tribe Dacetini, with a revision of the Strumigenys species of the Malagasy Region by Brian L. Fisher, and a revision of the Austral epopostrumiform genera by Steven O. Shattuck. Memoirs of the American Entomological Institute 65:1-1028.
Brown, W. L., Jr. 1954(1953). The neotropical species of the ant genus Strumigenys Fr. Smith: Group of elongata Roger. Journal of the New York Entomological Society 61:189-200.
Brown, W. L., Jr. 1962. The neotropical species of the ant genus Strumigenys Fr. Smith: Synopsis and keys to the species. Psyche 69:238-267.
Brown, W. L., Jr., Wilson, E. O. 1959. The evolution of the dacetine ants. Quart. Rev. Biol. 34:278-294.
Found most commonly in these habitats: 1 times found in Port of entry, 1 times found in tropical rainforest.
Found most commonly in these microhabitats: 1 times rocky loam soil, 1 times on orchids.
Collected most commonly using these methods: 1 times 24 hour mini-Winkler, litter extraction.
Elevations: collected from 50 - 671 meters, 263 meters average