Synonyms and other taxonomic changes
Philochloenia Dejean 1833, Anaeretes Dejean 1836, Dichelonycha Kirby 1837
Identification
Elongated, rather flattened metallic green or brown scarabs covered with silky pubescence
(4)
eyes large, prominent
tarsal claws cleft at tip
The genus can be separated into two groups based on the presence of a longitudinal groove ("sulcus") on the pronotum vs pronotum with only a faintly impressed, if any, mid-line
Range
Nearctic: Transcontinental, Canada to Mexico
(6)Habitat
On shoots and young leaves of herbaceous or woody plants, sometimes on flowers
(4)Food
Adults feed in spring on the leaves of trees, frequently conifers, sometimes causing conspicuous defoliation. Larvae feed on roots
(7)Remarks
At least some are both nocturnal and diurnal
(4); several species come to lights.
Print References
Brown, W.J. (1946) Notes on some species of Canthon and Dichelonyx (Coleoptera, Scarabaeidae). The Canadian Entomologist, 78, 104-109.
Cornell J.F. (1972) A taxonomic review of the beetle genus
Dichelonyx Harris in North America (Scarabaeidae: Melolonthinae). Ph.D. Dissertation, Oregon State U., Corvallis. 253 pp.
(Full text)
Fall, H.C. (1901) Notes on
Dichelonycha and
Cantharis, with descriptions of new species in other genera. Trans. Amer. Ent. Soc., 27, 277-310.
(Full Text)
Fall, H.C. (1907) Descriptions of new species. Trans. Amer. Ent. Soc., 33,
218-272.
(Page for D. testaceipennis; page for D. mormona)
Hatch, M.H. (1971) The beetles of the Pacific northwest. Part V. Rhipiceroidea, Sternoxi, Phytophaga, Rhynchophora, and Lamellicornia. Univ. of Wash. Publications in Biology, Vol. 16, 1-662.
(Download portal for PDF here...Dichelonyx on pg. 468)
Horn, G.H. (1876) Revision of the United States of
Ochodaeus and other genera of Scarabaeidae. Trans. Amer. Ent. Soc., 5,
177-197.
(Dichelonyx begins on pg. 186 here)
Kirby, W. (1837) The Insects. In: Fauna Boreali-Americana,[...]. Longman, London. 325 pp.
(Orig. Desc. D. backi with Fig. 6 of Plate II)
LeConte, J.L. (1856) Synopsis of the Melolonthidae of the United States. Jour. Acad. Nat. Sci. Philadelphia, (2)3, 225-288.
(Treatment of "Dichelonychia")
Leng, C.W. (1920) Catalogue of the Coleoptera of America, north of Mexico. John D. Sherman, Jr. Mount Vernon, NY. 470 pp.
(Entry for Dichelonyx)
Saylor L.W. (1945) Revision of the scarab beetles of the genus
Dichelonyx. Bull. Brooklyn Entomol. Soc. 40(5): 137-158.
(Full text)
VanDyke, E, C. (1918). Some new Beetles in the Families Cantharidae (Lampyridae), Ptinidae and Scarabaeidae, from Western North America. Bull. Brooklyn Ent. Soc. 13(1): 1-15
(Dichelonyx on pp. 11-13)