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For the United States & Canada

Genus Hoplia - Monkey Beetles

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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 Scarabaeoidea (Scarab, Stag and Bess Beetles)
Family Scarabaeidae (Scarab Beetles)
Subfamily Melolonthinae (May Beetles and Junebugs)
Tribe Hopliini
Genus Hoplia (Monkey Beetles)
Explanation of Names
Hoplia Illiger 1803
from Greek hoplon 'armor'(1)
The largest genus of the tribe, with 12 spp. in our area, another 12 in Mexico, 37 spp. in the New World(2), and ca. 250 spp. worldwide (mostly in Eurasia and Africa)(3)
7-12 mm
Medium-sized, mostly diurnal, flower-loving scarabs. Three-segmented antennal club. Mesotarsal claws distinctive(4)
key to nearctic species(3)
the New World species form three distinct and nearly disjunct groups: (i) western nearctic (5 spp.), (ii) eastern nearctic (7 spp.), and (iii) the neotropical species; the eastern spp. are relatively easy to identify, whereas the western ones are extremely variable and difficult(3)
Eurasia, Africa, and the New World; in our area, 5 spp. are western, 3 are restricted to se. US, and 4 are more widely eastern(3)
Meadow-type vegetation, orchards
Adults feed on flowers and foliage, often in groups
Life Cycle
Larvae feed on roots of various plants during the summer, hibernate in a late instar, pupate in soil in spring; adults emerge in spring(5)
Some are considered pests of ornamental plants and grapevines, especially H. callipyge
Internet References
Works Cited
1.Composition of scientific words
Brown R.W. 1956. Smithsonian Institution Press, Washington, DC. 882 pp.
2.Generic Guide to New World Scarab Beetles (by Brett Ratcliffe and Mary Liz Jameson)
3.A revision of the Hoplia of the Nearctic Realm (Coleoptera: Scarabaeidae)
A.R. Hardy. 1977. Occasional Papers in Entomology 23: 48 pp.
4.A Manual of Common Beetles of Eastern North America
Dillon, Elizabeth S., and Dillon, Lawrence. 1961. Row, Peterson, and Company.
5.The Common Insects of North America
Lester A. Swan, Charles S. Papp. 1972. Harper & Row.