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For Insects, Spiders & Their Kin
For the United States & Canada
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Species Megacyllene robiniae - Locust Borer

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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)
Superfamily Chrysomeloidea (Long-horned and Leaf Beetles)
Family Cerambycidae (Long-horned Beetles)
Subfamily Cerambycinae
Tribe Clytini
Genus Megacyllene
Species robiniae (Locust Borer)
Synonyms and other taxonomic changes
Megacyllene robiniae (J.R. Forster, 1771)
Explanation of Names
Latin for "of Robinia". Robinia is the genus of trees which includes the Black Locust.
Adult beetles are black with yellow stripes across. The third stripe on the elytra is W-shaped.
Anywhere Black Locust trees are present - most of the US.
Adults most noticeable in September when Goldenrod comes into bloom.
Larvae feed on Black Locust - (R. pseudoacacia and its cultivars and hybrids). Adults feed on pollen, particularly Goldenrod (Solidago).
Life Cycle
Eggs are laid in locust trees in the fall. Newly emerged larvae spend several months in tree trunks, first hibernating through the winter under the bark, then tunneling into trees in spring, eventually making tunnels about 4" long and .25" inch wide. They pupate late July/early August. Adult beetles emerge late August to September (click on the Data tab for a graphic confirmation of that fact).
Considered a serious pest of Black Locust trees; previously weakened or damaged trees are often killed by an infestation of the larvae. Previously confined to the native range of Black Locust in the northeast, it has spread with the trees throughout the US. Unfortunately Black Locust is used for reclamation and similar projects where trees are likely to be stressed out and thus more vulnerable to insect damage.
See Also
Megacyllene caryae, Hickory Borer, which is active as an adult in the spring, rather than in the fall as this species is. Larvae feed on hickory and pecan.
Megacyllene decora
Internet References