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For the United States & Canada
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Genus Oncopeltus

Black and orange beetle sp. - Oncopeltus fasciatus Large Milkweed Bug - Oncopeltus fasciatus Milkweed Bug - Oncopeltus fasciatus Large Milkweed Bug nymphs - Oncopeltus fasciatus Small beetle #2 on goldenrod - Oncopeltus fasciatus Oncopeltus sexmaculatus - moult series - Oncopeltus sexmaculatus Peck Road Oncopeltus - Oncopeltus Oncopeltus fasciatus - female on right - Oncopeltus fasciatus - male - female
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hemiptera (True Bugs, Cicadas, Hoppers, Aphids and Allies)
Suborder Heteroptera (True Bugs)
Infraorder Pentatomomorpha
Superfamily Lygaeoidea
Family Lygaeidae (Seed Bugs)
Subfamily Lygaeinae
Genus Oncopeltus
Explanation of Names
Oncopeltus Stål 1868
2 subgenera, with 7-8 spp. in our area(1)(2), 19 spp. in the New World(3), and 42 spp. total(2)
8-16 mm(3)
pantropical genus, ranging into US (O. fasciatus also into ON); in our area much more diverse in the deep south(3)
They feed primarily on species of milkweeds.
Salivary glands contain a catechol oxidase and peroxidase which counter the effects of plant products designed to inhibit feeding.(4)
Life Cycle
General life cycle and care information here.
Molting is induced by the stretching of the abdomen that happens over a prolonged period of feeding.(4)
more communal than Lygaeus, particularly in the nymphal stage
Works Cited
1.American Insects: A Handbook of the Insects of America North of Mexico
Ross H. Arnett. 2000. CRC Press.
2.The Lygaeidae of Florida (Hemiptera: Lygaeidae).
Slater & Baranowski. 1990. Florida Dept. of Ag. and Consumer Services, Gainesville. xv + 211 pp.
3.A Genus Level Revision of Western Hemisphere Lygaeinae (Heteroptera: Lygaeidae) with Keys to Species
Alex Slater. 1992. University of Kansas Science Bulletin.
4.The Insects : Structure and Function
R. F. Chapman. 1998. Cambridge University Press.