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

Species Placosternus difficilis - Mesquite Borer

Mesquite Borer, dorsal view - Placosternus difficilis Mesquite Borer Placosternus difficilis? - Placosternus difficilis Tentatively - Placosternus difficilis Tentatively - Placosternus difficilis Placosternus difficilis beetle - Placosternus difficilis beetle - Placosternus difficilis beetle - Placosternus difficilis
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 Chrysomeloidea (Long-horned and Leaf Beetles)
Family Cerambycidae (Long-horned Beetles)
Subfamily Cerambycinae
Tribe Clytini
Genus Placosternus
Species difficilis (Mesquite Borer)
Explanation of Names
Placosternus difficilis (Chevrolat 1862)
10-17 mm(1)
sutural one-third of elytron with distinct, abrupt depression margined by a slight carina (or ridge) (2)
so US (CA-TX, FL) to Honduras; West Indies(3); throughout TX (4); uncommon in FL (1)
Adults are 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(5)
Feb-Nov (mostly spring & fall) in sTX(5), mostly Jul-Oct in nTX(6)
Larval hosts: Prosopis, Acacia, Pithecellobium, Platanus, Citrus, Leucaena(5)
come to lights and bait
See Also
Megacyllene caryae (Gahan)
- Range: e. US, widely dist. across TX
Det. M. A. Quinn, 2017
Internet References
Texas Entomology - Mike Quinn 2009
Works Cited
1.Thomas M.C., Hill S., Morris R.F., Nearns G. () The Cerambycidae of Florida
2.Illustrated Key to the Longhorned Woodboring Beetles of the Eastern United States
Steven W. Lingafelter. 2008. Coleopterists Society.
3. A distributional checklist of the beetles (Coleoptera) of Florida.
Peck & Thomas. 1998. Florida Department of Agriculture and Consumer Services, Gainesville. 180 pp.
4.Texas A&M University Insect Collection (TAMUIC)
5.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.
6.The Cerambycidae of north-central Texas.
Lingafelter, S.W. & N.V. Horner. 1993. Coleopterists Bulletin, 47(2): 159-191.