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

Information about the 2019 BugGuide Gathering in Louisiana, July 25-27

Discussion, 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

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa


Species Prionus laticollis - Broad-necked Root Borer

Broad Necked Prionus - Prionus laticollis - female Prionus laticollis - male Root borer - Prionus laticollis - female Broad-necked Root Borer - Prionus laticollis Unknown Beetle - Prionus laticollis - male male Prionus laticollis? - Prionus laticollis - male Prionus laticollis Broad-necked Root Borer - Prionus laticollis
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 Prioninae
Tribe Prionini
Genus Prionus
No Taxon (subgenus Prionus)
Species laticollis (Broad-necked Root Borer)
20-50 mm
Pronotum as broad, or almost as broad, as base of elytra. Very dark. Elytra have irregular punctures, and each elytron has three indistinct longitudinal ridges. Pronotum has three blunt lateral teeth on each side. Antennae have 12-13 segments. Female much larger than male. The former is reported to be flightless, or nearly so. Males are attracted to lights.

Compare Prionus pocularis, which is more brown, base of pronotum narrower, elytra more punctate, eyes closely spaced, female metasternum hairy.
Eastern North America: Quebec, west to Ontario, Minnesota, Oklahoma. South to Florida formerly, but no recent records for that state.
Deciduous forests.
June-September (Northeast). June-August (North Carolina mountains). July, especially in North Carolina Piedmont.
Adults eat foliage, sometimes damage fruit trees, grape vines.
Life Cycle
Eggs are inserted into ground (or under litter) in groups. Larvae tunnel downward to feed on living roots of a variety of trees and shrubs. At first they may feed on bark, but then proceed to hollow out small roots. Pupation occurs in spring, about 10 cm under the ground. Life cycle probably three years.
See Also
Prionus pocularis
Print References
Dillon, p. 577, plate LVII (1)
Yanega, p. 27, fig. 9a-b (2)
Arnett et al., p. 295, fig. 690 (3)
Papp, p. 203, fig. 684 (4)
Brimley, p. 210 (5)
Swan and Papp, p. 442, fig. 928 (6)
Beal, p. 71 (7)
Baker, p. 200--description (8)
Works Cited
1.A Manual of Common Beetles of Eastern North America
Dillon, Elizabeth S., and Dillon, Lawrence. 1961. Row, Peterson, and Company.
2.Field Guide to Northeastern Longhorned Beetles (Coleoptera: Cerambycidae)
Douglas Yanega. 1996. Illinois Natural History Survey.
3.How to Know the Beetles
Ross H. Arnett, N. M. Downie, H. E. Jaques. 1980. Wm. C. Brown Publishers.
4.Introduction to North American Beetles
Charles S. Papp. 1984. Entomography Pubns.
5.Insects of North Carolina
C.S. Brimley. 1938. North Carolina Department of Agriculture.
6.The Common Insects of North America
Lester A. Swan, Charles S. Papp. 1972. Harper & Row.
7.Forest Insects of the Southeast
James A. Beal. 1952. Duke University School of Forestry (Bulletin no. 14).
8.Eastern Forest Insects
Whiteford L. Baker. 1972. U.S. Department of Agriculture · Forest Service.