Identification, Images, & Information
For Insects, Spiders & Their Kin
For the United States & Canada
Clickable Guide
Moths Butterflies Flies Caterpillars Flies Dragonflies Flies Mantids Cockroaches Bees and Wasps Walkingsticks Earwigs Ants Termites Hoppers and Kin Hoppers and Kin Beetles True Bugs Fleas Grasshoppers and Kin Ticks Spiders Scorpions Centipedes Millipedes

Upcoming Events

See Moth submissions from National Moth Week 2023

Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

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

Photos of insects and people from the 2018 gathering in Virginia, July 27-29

Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Previous events


Species Placosternus difficilis - Mesquite Borer

Mesquite Borer, dorsal view - Placosternus difficilis Megacyllene - Placosternus difficilis Tentatively - Placosternus difficilis Tentatively - Placosternus difficilis beetle - Placosternus difficilis beetle - Placosternus difficilis Placosternus - Placosternus difficilis Megacyllene caryae? - Placosternus difficilis
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Coleoptera (Beetles)
Suborder Polyphaga
No Taxon (Series Cucujiformia)
Superfamily Chrysomeloidea (Longhorn and Leaf Beetles)
Family Cerambycidae (Longhorn Beetles)
Subfamily Cerambycinae
Tribe Clytini
Genus Placosternus
Species difficilis (Mesquite Borer)
Explanation of Names
Placosternus difficilis (Chevrolat 1862)
10-17 mm(1)
so US (CA-TX, FL) to Honduras; West Indies(2); throughout TX(3)
Adults active day and night, running rapidly along freshly cut branches of their host plants and feeding on the blossoms of Koeberlinia, Acacia, Baccharis, Bumelia, Clematis, and Solidago(4)
Feb-Nov (mostly spring & fall) in sTX(4), mostly Jul-Oct in nTX(5)
Larval hosts: Prosopis, Acacia, Pithecellobium, Platanus, Citrus, Leucaena(4)
come to lights and bait
Internet References
Works Cited
1.The Cerambycidae of North America. Part V. ... subfamily Cerambycinae, tribes Callichromatini through Ancylocerini
Linsley E.G. 1964. U. Cal. Publ. Entomol. 22: 1-197.
2. A distributional checklist of the beetles (Coleoptera) of Florida.
Peck & Thomas. 1998. Florida Department of Agriculture and Consumer Services, Gainesville. 180 pp.
3.Texas A&M University Insect Collection (TAMUIC)
4.The Cerambycidae, or longhorned beetles, of southern Texas: a faunal survey (Coleoptera)
Hovore F.T., Penrose R.L., Neck R.W. 1987. Proc. Calif. Acad. Sci. 44: 283-334.
5.The Cerambycidae of north-central Texas.
Lingafelter, S.W. & N.V. Horner. 1993. Coleopterists Bulletin, 47(2): 159-191.