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.

STAPHYLINIDAE - PAEDERINAE

3 tribes, 15 genera, 62 species

Tribe Lathrobiini

Achenomorphus corticinus (Gravenhorst, 1802): Hubbard and Schwarz (1878), Ruesink and Parsons (2023b), MSU-ARC

Astenus americanus (Casey, 1905): Ruesink and Parsons (2023b), MSU-ARC

?Astenus binotatus (Say, 1823): Hubbard and Schwarz (1878); IN in D&A

Astenus brevipennis (Austin, 1877): Andrews (1923), Hubbard and Schwarz (1878), Evans (2014), MSU-ARC

Astenus discopunctatus (Say, 1831): Andrews (1923), Hatch (1925), Downie and Arnett (1996), MSU-ARC

??Astenus longiusculus (Mannerheim, 1830): Hubbard and Schwarz (1878) as Sunius longiusculus Mannh.

?Astenus prolixus (Erichson, 1840): Andrews (1923), Hubbard and Schwarz (1878); IN in D&A, IL in GBIF,SCAN

Lathrobium amplipenne Casey, 1905: Ruesink and Parsons (2023b), MSU-ARC; originally described from the Hudson Valley in NY, also known from Ontario & New Brunswick

Lathrobium armatum Say, 1830: Hubbard and Schwarz (1878), Ruesink and Parsons (2023b), MSU-ARC

Lathrobium debile LeConte, 1880: Casey (1905), Ruesink and Parsons (2023b), MSU-ARC; described from Detroit material

Lathrobium fauveli Duvivier, 1883: Adams (1909), Andrews (1923), Ruesink and Parsons (2023b), MSU-ARC

Lathrobium innocens Casey, 1905: Casey (1905), Downie and Arnett (1996), MSU-ARC; described from Michigan (Marquette) material

Lathrobium nigrolineum (Casey, 1905): Ruesink and Parsons (2023b), MSU-ARC; MB in GBIF & original description, we are not aware of any records except Manitoba

??Lathrobium obtusum Casey, 1905: Andrews (1923); MA & MB in D&A (1996) so it might be in MI, but an Andrews specimen from Whitefish Point in MSU-ARC has been IDed by GLP as L. fauveli instead

?Lathrobium othioides LeConte, 1880: Downie and Arnett (1996)

??Lathrobium puncticolle Kirby, 1837: Hubbard and Schwarz (1878); a very poorly known sp.; not in any key we could find

?Lathrobium simile LeConte, 1863: Hubbard and Schwarz (1878); IN in D&A 1996, ON in GBIF, IL in SCAN

?Lathrobium sparsellum Casey, 1905: Ruesink and Parsons (2023b), MSU-ARC; only MB in SCAN, GBIF & original description, but Bousquet (2013) has it across most of southern Canada

Lathrobium spissicorne Casey, 1905: Casey (1905), Leng (1920), Downie and Arnett (1996), MSU-ARC; Detroit mentioned in original description

??Lathrobium tenue LeConte, 1863: Hubbard and Schwarz (1878); described from one NY specimen

Lithocharis nigriceps Kraatz, 1859: Ruesink and Parsons (2023b), MSU-ARC; IL, OH in D&A 1996

Lithocharis ochracea (Gravenhorst, 1802): Hubbard and Schwarz (1878), Leng (1920), Ruesink and Parsons (2023b), MSU-ARC; IN in D&A 1996 (cosmopolitan)

Lobrathium collare (Erichson, 1840): Andrews (1923), Hubbard and Schwarz (1878), Ruesink and Parsons (2023b), MSU-ARC

Lobrathium grande (LeConte, 1863): Watrous (1981), Casey (1905), Hubbard and Schwarz (1878), Downie and Arnett (1996), MSU-ARC

Lobrathium longiusculum (Gravenhorst, 1802): Hubbard and Schwarz (1878), Ruesink and Parsons (2023b), MSU-ARC

Pseudolathra ambigua (LeConte, 1880): Downie and Arnett (1996), MSU-ARC

Pseudolathra americana (Duvivier, 1883): Townsend (1889), Ruesink and Parsons (2023b), MSU-ARC

Pseudolathra barda (Casey, 1905): Ruesink and Parsons (2023b), MSU-ARC; PA in D&A 1996

?Scopaeus exiguus Erichson, 1840: Hubbard and Schwarz (1878)

?Scopaeus notangulus Casey, 1905: Downie and Arnett (1996); in the original description Casey (1905) states the range as Iowa to Lake Superior.

??Tetartopeus angularis (LeConte, 1863): Andrews (1923), Hubbard and Schwarz (1878) as Lathrobium or Stilicus angulare Lec.; a Mexican sp.?

Tetartopeus captiosus Casey, 1905: Watrous (1980), Andrews (1923), Hubbard and Schwarz (1878), Downie and Arnett (1996), MSU-ARC

Tetartopeus floridanus Casey, 1905: Watrous (1980), MSU-ARC

Tetartopeus niger (LeConte, 1863): Watrous (1980), Casey (1905), Hubbard and Schwarz (1878), Downie and Arnett (1996), MSU-ARC

Tetartopeus nitidulus (LeConte, 1880): LeConte (1880), Leng (1920), MCZ; described from MI, lectotype in MCZ

Tetartopeus rubripennis Casey, 1905: Watrous (1980), Downie and Arnett (1996), MSU-ARC

Tetartopeus tetricus Casey, 1905: Watrous (1980), Downie and Arnett (1996), MSU-ARC

Tribe Paederini

?Homaeotarsus badius (Gravenhorst, 1802): Hubbard and Schwarz (1878), Ruesink and Parsons (2023b), MSU-ARC; a difficult genus that needs study; this sp. is very similar to H. strenuus, so consider this ID as tentative

Homaeotarsus bicolor (Gravenhorst, 1802): Andrews (1916), Hatch (1925), Hubbard and Schwarz (1878), MSU-ARC; a very common sp. in MI, odd that it has not appeared in more recent literature

Homaeotarsus capito (Casey, 1885): Ruesink and Parsons (2023b), MSU-ARC

Homaeotarsus cinctus (Say, 1830): Hubbard and Schwarz (1878), Ruesink and Parsons (2023b), MSU-ARC

Homaeotarsus cribratus (LeConte, 1863): Hubbard and Schwarz (1878), Ruesink and Parsons (2023b), MSU-ARC

??Homaeotarsus floridanus (LeConte, 1878): Downie and Arnett (1996) as Lathrobium (Tetartopeus) floridanum LeConte; FL is only other location

?Homaeotarsus lecontei (Horn, 1885): Ruesink and Parsons (2023b), MSU-ARC; a difficult genus that needs study, consider this ID as tentative

Homaeotarsus pallipes (Gravenhorst, 1802): Hatch (1925), Hubbard and Schwarz (1878), Ruesink and Parsons (2023b), MSU-ARC

Homaeotarsus parallelus (Casey, 1885): Ruesink and Parsons (2023b), MSU-ARC; a difficult genus that needs study, consider this ID as tentative

Homaeotarsus sellatus (LeConte, 1863): Andrews (1916), Hatch (1925), Ruesink and Parsons (2023b), MSU-ARC

Ochthephilum fracticorne (Paykull, 1800): Downie and Arnett (1996)

??Ochthephilum pusillum (LeConte, 1863): Andrews (1916) as Cryptobium pusillum Lec.

Orus dentiger (LeConte, 1880): Herman (1965), MSU-ARC

Orus rubens (Casey, 1905): Ruesink and Parsons (2023b), MSU-ARC

Paederus iowensis (Casey, 1905): Ruesink and Parsons (2023b), MSU-ARC; ON, MN, PA in SCAN

Paederus littorarius Gravenhorst, 1806: Haack and Ruesink (2020), Andrews (1923), Hatch (1925), Hubbard and Schwarz (1878), MSU-ARC

Paederus palustris Austin, 1877: Hubbard and Schwarz (1878), Ruesink and Parsons (2023b), MSU-ARC; IN, IA in D&A

Rugilus angularis (Erichson, 1840): Hubbard and Schwarz (1878), Downie and Arnett (1996), MSU-ARC

?Rugilus biarmatus (LeConte, 1880): Andrews (1923), MSU-ARC; MSU has 3 specimens that probably are this species but we are not certain the IDs are correct

Rugilus dentatus Say, 1831: Andrews (1923), Hubbard and Schwarz (1878), Ruesink and Parsons (2023b), MSU-ARC

Rugilus orbiculatus (Paykull, 1789): Hoebeke (1995), MSU-ARC

Rugilus rudis (LeConte, 1863): Hubbard and Schwarz (1878), Ruesink and Parsons (2023b), MSU-ARC

Sunius confluentus (Say, 1831): Andrews (1923), Hubbard and Schwarz (1878), Hatch (1925), Ruesink and Parsons (2023b), MSU-ARC

Tribe Pinophilini

??Palaminus normalis LeConte, 1878: Hubbard and Schwarz (1878); a SE/Gulf species that probably should not be this far north

Palaminus testaceus Erichson, 1840: Hubbard and Schwarz (1878), Ruesink and Parsons (2023b), MSU-ARC; IN in D&A

The following species were also reported from Michigan, but we consider them to be adventive, misidentifications or other errors:

Tribe Lathrobiini

Astenus linearis (Erichson, 1840): Hubbard and Schwarz (1878) as Sunius linearis Er.; presumably A. americanus which was not described until later

Eustilicus tristis (Melsheimer, 1844): Andrews (1916) as Stilicus tristis Melsh.; northern limit for this species is near the Ohio River, MSU has two Andrews specimens from the Charity Islands labeled as this sp. but they are actually Lobrathium grande

Tribe Paederini

Rugilus lacustrinus (Casey, 1905): Downie and Arnett (1996); Downie and Arnett (1996) misinterpreted "Lake Superior (Bayfield)" in Casey (1905) as MI when it's actually WI

This family list was last updated: April 28, 2023