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Genus Dichelonyx

Is this Dichelonyx? - Dichelonyx Scarab - Dichelonyx Dichelonyx sp.? - Dichelonyx fulgida Beetle - Dichelonyx Beetle - Dichelonyx Beetle - Dichelonyx Metallic Green Beetle - Dichelonyx Dichelonyx elongatula ? - Dichelonyx
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 Dichelonychini
Genus Dichelonyx
Synonyms and other taxonomic changes
Philochloenia Dejean 1833
Anaeretes Dejean 1836
Dichelonycha Kirby 1837
Explanation of Names
Dichelonyx Harris 1827
'split claws'
27 spp. in our area(1), Evans & Smith(2005)
5.6-14.5 mm(2)(3)(4)
Elongated and rather flattened scarabs, usually metallic green or brown and covered with a silky pubescence (3). Other characters:
eyes large, prominent
first abdominal sternite mostly visible, not covered by metacoxae
tarsal claws cleft at tip
The genus can be separated into two groups ("sulcate" vs. "non-sulcate") based on the presence of a moderately deep longitudinal groove ("sulcus") on the pronotum versus pronotum with only a faintly impressed medial line or none at all.
Photos illustrating some of these characters:
Nearctic: Transcontinental, Canada to Mexico(5)
On shoots and young leaves of herbaceous or woody plants, sometimes on flowers(3)
Typically, late spring(3); Apr-Jun in SC(4)
Adults feed in spring on the leaves of trees, frequently conifers, sometimes causing conspicuous defoliation. Larvae feed on roots(6)
Life Cycle
Life cycle takes 2-3 years(6)
At least some are both nocturnal and diurnal(3); several species come to lights.
Print References
LeConte, J.L. (1856) Synopsis of the Melolonthidae of the United States. Jour. Acad. Nat. Sci. of Philadelphia, (2)3, 225-288. (Full Text)
Horn, G.H. (1876) Revision of the United States of Ochodaeus and other genera of Scarabaeidae. Trans. Amer. Entomol. Soc., 5,177-197. (Full Text)
Fall, H.C. (1901) Notes on Dichelonycha and Cantharis, with descriptions of new species in other genera. Trans. Amer. Entomol. Soc., 27, 277-310. (Full Text)
Saylor L.W. (1945) Revision of the scarab beetles of the genus Dichelonyx. Bull. Brooklyn Entomol. Soc. 40(5): 137-158. (Full Text)
Cornell, James F. (1972). A Taxonomic Review of the Beetle Genus Dichelonyx Harris in North America (Scarabaeidae: Melolonthinae). Ph.D. Dissertation, Oregon State University, Corvallis. 253 pp. (Full Text)
Works Cited
1.The Scarabaeoid Beetles of Nebraska
Brett C. Ratcliffe & M.J. Paulsen. 2008. University of Nebraska State Museum, Vol 22, 570 pp.
2.Field Guide to Beetles of California
Arthur V. Evans and James N. Hogue. 2006. University of California Press.
3.A Manual of Common Beetles of Eastern North America
Dillon, Elizabeth S., and Dillon, Lawrence. 1961. Row, Peterson, and Company.
4.Scarab beetles (Coleoptera: Scarabaeidae) of South Carolina
Phillip J. Harpootlian. 2001. Clemson University Public Service.
5.The Beetles of Northeastern North America, Vol. 1 and 2.
Downie, N.M., and R.H. Arnett. 1996. The Sandhill Crane Press, Gainesville, FL.
6.Western Forest Insects
Furniss, R.L. and Carolin, V.M. 1977. 1977. U.S.D.A. Forest Service Misc. Publ. 1339.