Introduction. The name of each listed species is followed by up to five sources that report the species as occurring in Michigan. Sources in all upper-case letters refer to specific insect collections: MSU-ARC refers to material held by the Michigan State University Arthropod Research Collection (data provided by G. Parsons). All others refer to collection data extracted from the Symbiota Collections of Arthropods Network (SCAN) database online at https://scan-bugs.org/. See the Methods page for a list of abbreviations and associated collections.
Species names preceded by a single '?' are considered probable (for occurring in Michigan) but uncertain records. Those preceded by '??' are considered possible but unlikely to occur in Michigan. Species that are fully accepted as having valid Michigan records are unmarked. Species reported in the literature that we consider to be erroneous Michigan records are in a separate list following the others.
BYRRHIDAE
2 subfamilies, 2 tribes, 5 genera, 9 species (plus four species reported for Michigan in error)
Subfamily Byrrhinae
Tribe Byrrhini
Arctobyrrhus subcanus (LeConte, 1878): LeConte (1878), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC; described from Escanaba specimens
Byrrhus americanus LeConte, 1850: El Moursy (1970), Downie and Arnett (1996), Hubbard and Schwarz (1878), MSU-ARC
Byrrhus concolor Kirby, 1837: El Moursy (1970), MSU-ARC
Byrrhus cyclophorus Kirby, 1837: Johnson (2016), Downie and Arnett (1996), Hubbard and Schwarz (1878)
Byrrhus geminatus LeConte, 1854: El Moursy (1970), Johnson (2016), Hubbard and Schwarz (1878), MSU-ARC
Byrrhus kirbyi LeConte, 1854: Johnson (2016), El Moursy (1970), Andrews (1916), MSU-ARC
Cytilus alternatus (Say, 1825): Haack and Ruesink (2020), BugGuide, Hubbard and Schwarz (1878), MSU-ARC
Porcinolus undatus (Melsheimer, 1844): Downie and Arnett (1996), Hatch (1924)
Subfamily Syncalyptinae
Tribe Syncalyptini
Curimopsis echinata (LeConte, 1850): Downie and Arnett (1996), Hubbard and Schwarz (1878), Ruesink and Parsons (2021), MSU-ARC; MSU-ARC has 7 very old specimens, all from the eastern UP
The following species were reported from Michigan, but we consider them to be adventive, misidentifications or other errors:
Byrrhus eximius LeConte, 1850: Downie and Arnett (1996); a western sp. that should not be in MI
Byrrhus fasciatus (Forster, 1771): El Moursy (1970); a European sp. that does not occur in N.A. (Johnson, 1991)
Byrrhus murinus Fabricius, 1794: Andrews (1923), Hubbard and Schwarz (1878); not in NA, Johnson (2016) says this refers to Porcinolus undatus
Cytilus sericeus (Forster, 1771): Downie and Arnett (1996), Andrews (1923), Hubbard and Schwarz (1878); C. sericeus is European and does not occur in America, Johnson (2016) says this refers to Cytilus alternatus
This family list was last updated: October 5, 2021