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.

THROSCIDAE

2 genera, 7 species

Aulonothroscus constrictor (Say, 1839): Haack and Ruesink (2020), Blanchard (1917), Hubbard and Schwarz (1878), Downie and Arnett (1996), MSU-ARC

Aulonothroscus distans Blanchard, 1917: Haack and Ruesink (2020), MSU-ARC; a single specimen known from MI (Antrim Co.), also known from IN and ON

Aulonothroscus laticeps Blanchard, 1917: Blanchard (1917), Downie and Arnett (1996), MSU-ARC?; described from a Detroit specimen coll. by Hubbard & Schwarz, not certain the MSU specimens are identified correctly

Aulonothroscus punctatus (Bonvouloir, 1859): Blanchard (1917), Hubbard and Schwarz (1878), Downie and Arnett (1996), MSU-ARC

Aulonothroscus teretrius Blanchard, 1917: Blanchard (1917), Downie and Arnett (1996)

Trixagus carinicollis (Schaeffer, 1916): Haack and Ruesink (2020), Downie and Arnett (1996), MSU-ARC; Blanchard (1917) includes "Lake Superior" in his distribution, but does not say MI.

Trixagus chevrolati (Bonvouloir, 1859): Blanchard (1917), Hubbard and Schwarz (1878), Downie and Arnett (1996), MSU-ARC

This family list was last updated: March 10, 2023