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