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Species Glischrochilus quadrisignatus - Four-spotted Sap Beetle

4-spotted - Glischrochilus quadrisignatus Which Glischrochilus? - Glischrochilus quadrisignatus Ventral view - Glischrochilus quadrisignatus Glischrochilus quadrisignatus Sap Beetle - Glischrochilus quadrisignatus Beetle - Glischrochilus quadrisignatus small black and orange fungus beetle - Glischrochilus quadrisignatus Glischrochilus quadrisignatus ? - Glischrochilus quadrisignatus
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga (Water, Rove, Scarab, Long-horned, Leaf and Snout Beetles)
No Taxon (Series Cucujiformia)
Superfamily Cucujoidea (Sap, Bark and Fungus Beetles)
No Taxon (Nitidulid series)
Family Nitidulidae (Sap-feeding Beetles)
Subfamily Cryptarchinae
Genus Glischrochilus
No Taxon (subgenus Librodor)
Species quadrisignatus (Four-spotted Sap Beetle)
Other Common Names
Picnic Beetle, Beer Bug
Explanation of Names
Glischrochilus quadrisignatus (Say 1835)
4.0-7.0 mm(1)
Distinguished from G. fasciatus by smaller elytral blotches (the anterior ones farther apart than the posterior) blotches(2) and from G. sanguinolentus by dark venter (reddish-brown in the latter)(3)
Widespread in NA (NF-BC to FL-TX-UT); adventive and widespread in Europe(4)(5)
various fermenting substances
association with opened seed pods of Asclepias syriaca (6)
attracted by the odor of fermenting fruits and vegetables; fly into beer or soft drinks
Works Cited
1.An annotated checklist of Wisconsin sap and short-winged flower beetles (Coleoptera: Nitidulidae, Kateretidae)
Price M.B., Young D.K. 2006. Insecta Mundi 20: 69-84.
2.How to identify common nitidulid beetles associated with oak wilt mats in Minnesota
Cervenka V.J., Skalbeck T.C., Kyhl J.F., Blackford D.C., Juzwik J.J., Seybold S.J. 2001. USDA Forest Service, North Central Research Station, St. Paul, MN. HT-71: 1-16.
3.A Manual of Common Beetles of Eastern North America
Dillon, Elizabeth S., and Dillon, Lawrence. 1961. Row, Peterson, and Company.
4.Checklist of beetles (Coleoptera) of Canada and Alaska. Second edition
Bousquet Y., Bouchard P., Davies A.E., Sikes D.S. 2013. ZooKeys 360: 1–402.
5.Beetles of Eastern North America
Arthur V. Evans. 2014. Princeton University Press.
6.Survey of Coleoptera collected on the common milkweed, Asclepias syriaca, at one site in Ohio
Dailey, P.J., R.C. Graves and J.M. Kingsolver. 1978. The Coleopterists Bulletin, 32(3): 223-229.