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Species Picromerus bidens

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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 Pentatomoidea
Family Pentatomidae (Stink Bugs)
Subfamily Asopinae (Predatory Stink Bugs)
Genus Picromerus
Species bidens (Picromerus bidens)
Other Common Names
Spiked Shieldbug (UK)
Explanation of Names
Picromerus bidens (Linnaeus 1758)
11-14 mm(1)
large laterally-projecting spine at humeral angle; tibiae typically tricolored: brown at the "knee", pale in the middle, and reddish apically
ne NA: adventive in ne. US (ME-NY) & adjacent Canada (NS-ON); native to the Palaearctic (1)(2)(3)(4)
mostly: June-Sept (BG data)
caterpillars, esp. webworms and tent caterpillars(2)
Life Cycle
gregarious during first two instars and phytophagous, but gradually disperses in later instars and becomes predacious (1)
earliest NA record: ME 1932(1)
potentially useful predator of certain leaf-feeding insects (e.g., pine sawfly larvae)(4)
Internet References