Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada

Species Cynaeus angustus - Larger Black Flour Beetle

Ground Beetle - Cynaeus angustus Cynaeus angustus Tenebrionidae, head & pronotum, lateral - Cynaeus angustus beetle - Cynaeus angustus Tiny Brown Beetle - Cynaeus angustus Pinkish-brown beetle - Cynaeus angustus Early July beetle - Cynaeus angustus Little Teneb? - Cynaeus angustus
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 Tenebrionoidea (Fungus, Bark, Darkling and Blister Beetles)
Family Tenebrionidae (Darkling Beetles)
Subfamily Diaperinae
Tribe Diaperini
Subtribe Adelinina
Genus Cynaeus
Species angustus (Larger Black Flour Beetle)
Synonyms and other taxonomic changes
C. angustatus (misspelling) e.g.(1)
Explanation of Names
Cynaeus angustus (LeConte 1851)
angustus = 'narrow'
5-6 mm(2)
Widespread(3), native to sw. US but spread rapidly eastward with agriculture, grain storage, etc. (Warren Steiner, pers. comm., 11/17/09)
Stored products; sometimes found under bark, hay bales & debris. Prior to 1938, when it was discovered infesting stored grain in the Midwest, was only known from debris at the base of yucca plants.(4)
grain (damaged or undamaged); prefers maize and barley, also feeds on fungi associated with insect-infested grain(4); minor pest of stored cereal products(3)
Life Cycle
9–11 larval instars(4)
common pest of farm-stored grain in north-central US(4)
Works Cited
1.The Beetles of Northeastern North America, Vol. 1 and 2.
Downie, N.M., and R.H. Arnett. 1996. The Sandhill Crane Press, Gainesville, FL.
2.Tenebrionoidea of South Carolina
Janet C. Ciegler. 2014. Clemson University.
3.American Beetles, Volume II: Polyphaga: Scarabaeoidea through Curculionoidea
Arnett, R.H., Jr., M. C. Thomas, P. E. Skelley and J. H. Frank. (eds.). 2002. CRC Press LLC, Boca Raton, FL.
4.Handbook of urban insects and arachnids: A handbook of urban entomology
Robinson W.H. 2005. Cambridge University Press.