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 - PSELAPHINAE

1 subfamily, 12 tribes, 27 genera, 63 species

Tribe Batrisini

Batrisodes furcatus (Brendel, 1890): Park (1947), Chandler (1997a)

Batrisodes lineaticollis (Aubé, 1833): Chandler (1997a), Park (1947), Hubbard and Schwarz (1878), MSU-ARC

Batrisodes riparius (Say, 1824): Chandler (1997a)

Batrisodes scabriceps (LeConte, 1849): Park (1947), Chandler (1997a)

Batrisodes schaumii (Aubé, 1844): Chandler (1997a), Park (1947), Hubbard and Schwarz (1878)

??Batrisodes spretus (LeConte, 1849): Hatch (1925), Hubbard and Schwarz (1878) as Batrisus spretus Lec.; a bit north of expected range which is IL, IN & OH in Chandler (1997a)

Batrisodes striatus striatus (LeConte, 1849): Chandler (1997a), Park (1947), Leng (1920), Hubbard and Schwarz (1878), Downie and Arnett (1996)

Tribe Brachyglutini

Brachygluta arguta (Casey, 1897): Chandler et al. (2015), Chandler (1997a), Leng (1920)

Brachygluta corniventris (Motschulsky, 1857): Chandler et al. (2015), Chandler (1997a)

??Brachygluta dentata (Say, 1824): Hubbard and Schwarz (1878); mostly on east coast in Chandler (1997a)

Decarthron abnorme (LeConte, 1849): Chandler (1997a), Reichle (1966), Hubbard and Schwarz (1878), MSU-ARC

Decarthron defectum Park, 1958: Chandler (1997a), Reichle (1966)

??Decarthron formiceti (LeConte, 1849): Hubbard and Schwarz (1878)

??Decarthron longulum (LeConte, 1849): Hubbard and Schwarz (1878)

Eutrichites zonatus (Brendel, 1865): Schwarz (1876), Hubbard and Schwarz (1878), MSU-ARC; in the genus Bythinus in the old literature

Reichenbachia borealis Casey, 1897: Chandler (1997a), Reichle (1966)

Reichenbachia corporalis Casey, 1897: Chandler (1997a), Leng (1920), Downie and Arnett (1996)

Reichenbachia divergens (LeConte, 1880): Chandler (1997a)

Reichenbachia gracilis (Casey, 1884): Chandler (1997a), Leng (1920), Downie and Arnett (1996), MSU-ARC

Reichenbachia peregrinator Casey, 1897: Chandler (1997a)

Reichenbachia propinqua (LeConte, 1849): Chandler (1997a), Leng (1920), Hubbard and Schwarz (1878), Downie and Arnett (1996)

Reichenbachia pseudokansana Carlton, 2003: FMNH:FMNHINS; type specimen, from Warren Woods, Berrien Co. (1984)

??Reichenbachia puncticollis (LeConte, 1849): Reichle (1966); a SE sp. that prob. does not occur in MI or any of the other states where this paper has it

Reichenbachia radians (LeConte, 1880): Chandler (1997a)

Reichenbachia rubricunda (Aubé, 1844): Chandler (1997a), Hubbard and Schwarz (1878), Downie and Arnett (1996)

Reichenbachia scabra (Brendel, 1865): Chandler (1997a), Reichle (1966), Hubbard and Schwarz (1878)

Reichenbachia spatulifer Casey, 1897: Chandler (1997a), Reichle (1966), MSU-ARC

Rybaxis clavata (Brendel, 1865): Chandler (1997a), Reichle (1966), Hubbard and Schwarz (1878), MSU-ARC

Rybaxis conjuncta (LeConte, 1849): Chandler (1997a), Leng (1920), Hubbard and Schwarz (1878)

Rybaxis mystica Casey, 1893: Chandler (1997a), MSU-ARC

Rybaxis varicornis (Brendel, 1890): Chandler (1997a), Reichle (1966)

Tribe Bythinini

Tychobythinus bythinioides (Brendel, 1865): Chandler (1997a), Reichle (1966)

Tribe Clavigerini

Adranes lecontei Brendel, 1865: Chandler (1997a)

Tribe Ctenistini

Ctenisodes lacustris (Casey, 1897): Chandler (1997a), Downie and Arnett (1996), MSU-ARC

Ctenisodes piceus (LeConte, 1849): Chandler (1997a), Hubbard and Schwarz (1878), MSU-ARC

??Ctenisodes zimmermanni (LeConte, 1849): Hubbard and Schwarz (1878) as Ctenistes Zimmermanni Lec.

Tribe Euplectini

Euplectus confluens LeConte, 1849: Chandler (1997a), Downie and Arnett (1996)

Euplectus karstenii (Reichenbach, 1816): Chandler (1997a), MSU-ARC

Pycnoplectus congener (Casey, 1884): Chandler (1997a)

Pycnoplectus interruptus (LeConte, 1849): Chandler (1997a), Hubbard and Schwarz (1878)

Pycnoplectus linearis (LeConte, 1849): Chandler (1997a)

Pycnoplectus sp.: MSU-ARC; 2 specimens of this genus in the MSU collection that we cannot ID to species with confidence (they are likely one of the already reported sp.)

Tribe Pselaphini

Pselaphus bellax Casey, 1893: Chandler (1997a), Downie and Arnett (1996), Reichle (1966), MSU-ARC

?Pselaphus erichsoni LeConte, 1849: Hubbard and Schwarz (1878), Downie and Arnett (1996), Hatch (1925); MI record needs confirmation

Pselaphus fustifer Casey, 1893: Chandler (1997a), Reichle (1966)

Tribe Tmesiphorini

??Tmesiphorus carinatus (Say, 1824): Hubbard and Schwarz (1878); a SE sp.??

Tribe Trichonychini

Actizona trifoveata (Park, 1963): Chandler (1997a)

Bibloplectus integer (LeConte, 1878): Chandler (1997a), Leng (1920), Hubbard and Schwarz (1878), Downie and Arnett (1996)

?Bibloplectus ruficeps (Motschulsky, 1857): Leng (1920), Downie and Arnett (1996)

Melba parvula (LeConte, 1849): Chandler (1989)

Melba sulcatula Casey, 1897: Chandler (1997a), MSU-ARC

??Pseudactium arcuatum (LeConte, 1849): Hubbard and Schwarz (1878) as Euplectus arcuatus Lec.

?Ramecia capitula (Casey, 1884): Leng (1920), Downie and Arnett (1996)

Ramecia crinita (Brendel, 1865): Chandler (1997a), Leng (1920), Hubbard and Schwarz (1878), Downie and Arnett (1996)

??Trimiomelba dubia (LeConte, 1849): Schwarz (1876), Hubbard and Schwarz (1878) as Trimium dubium Lec.; a bit north of the expected range, which is IL, IN & OH in Chandler (1997a)

Trimioplectus auerbachi Park, 1949: Park (1949), Chandler (1997a), Chandler (1989), Downie and Arnett (1996); described from Michigan material

Tribe Trogastrini

Conoplectus canaliculatus (LeConte, 1849): Chandler (1997a), Reichle (1966), Leng (1920), Hubbard and Schwarz (1878), Downie and Arnett (1996)

Rhexius insculptus LeConte, 1849: Hubbard and Schwarz (1878), MSU-ARC

Tribe Tychini

?Cylindrarctus longipalpus (LeConte, 1849): Wolcott (1909), Hubbard and Schwarz (1878)

Lucifotychus testaceus (Casey, 1884): Chandler (1997a), Reichle (1966), MSU-ARC

Tribe Tyrini

Cedius cruralis Park, 1949: Park (1949), Chandler (1997a); described from Michigan material

Cedius spinosus LeConte, 1849: Hubbard and Schwarz (1878), Ruesink and Parsons (2024), MSU-ARC; IL, IN, OH in Chandler (1997a)

Ceophyllus monilis LeConte, 1849: Chandler (1997a), Leng (1920), Hubbard and Schwarz (1878), Downie and Arnett (1996), MSU-ARC

Tyrus semiruber Casey, 1897: Hubbard and Schwarz (1878), Chandler (1997a), MSU-ARC; what Hubbard and Schwarz (1878) & Chandler (1997a) called T. humeralis is T. semiruber per Chandler (1999)

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

Tribe Ctenistini

Ctenisodes consobrinus (LeConte, 1849): Hubbard and Schwarz (1878) as Ctenistes consobrinus Lec.; an east coast sp. that should not occur in MI

Tribe Tychini

Custotychus minor (LeConte, 1849): Hubbard and Schwarz (1878), SI:NMNH as Tychus minor Lec.; SE US only in Chandler (1997a), this sp. was confused with L. testaceus in the old literature

This family list was last updated: April 14, 2023