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Photos of insects and people from the 2019 BugGuide Gathering in Louisiana, July 25-27

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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 humeral spine; tibiae typically tricolored: brown at the knee, pale in the middle, and reddish apically
native to the Palaearctic (across n Eurasia), adventive in our area: ne NA (NS-PA to ON-MI)(2)
caterpillars, esp. webworms and tent caterpillars(3)
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