Identification of Myrmecophilus is not difficult because of the appearance, small size (2-5 mm) and the fact that they live in ant colonies. They have been reported from Lasius, Camponotus, Formica, Aphaenogaster, and Crematogaster ant nests.
Myrmecophilus pergandei is the expected species for most of Iowa. M. nebrascensis has not been reported from Iowa, but may occur in the western tier of counties. It has been reported just across the Missouri river in Nebraska.
SINA covers this species, though it does not sing: https://orthsoc.org/sina/394a.htm
Mississippi Entomological Museum paper:
https://mississippientomologicalmuseum.org.msstate.edu/Researchtaxapages/Formicidaepages/ant.publications/Myrm.pergandei.pdf
Hebard (1920): https://www.jstor.org/stable/pdf/25077026.pdf
Probably occurs statewide. Knutson and Jaques (1935) did not list this species for Iowa. Hebard (1920) did not list any specimens from Iowa. The SINA range map covers most of Iowa because of records in surrounding states, but show no records from Iowa. SCAN and BugGuide have no records. The first record for Iowa appears to be an iNaturalist record from 2020.
Lives in ant nests of various species.