Other Common Names
Le Scarabée maculé (French). Maculated Scarab (coinage).
Synonyms and other taxonomic changes
Orig. Comb: Cetonia maculosa Knoch, 1801
Syn: Gnorimus maculosus (Knoch)
Explanation of Names
maculosus refers to spotted (maculate) pattern on pronotum and elytra.
Medium-sized scarab with prominent maculations
. Bright yellow pygidium
with dark "U-shaped" mark on ventral surface is also distinctive.
e US, barely reaching into Canada (QC, NS, ON), range: TX-FL-NS-MN (1)
Adults found on a variety of flowering shrubs and trees, esp. Dogwood, wild rose, other Rosaceae (such as Rubus), tulip-tree (Liriodendron). The beetles presumably take nectar and/or pollen.
Larvae have been collected from decomposing trunk of Redbud, Cercis canadensis (2)
. Dr. Martin MacKenzie (pers. comm. to P. Coin) of the USDA Forest Service in West Virginia found a group of four larvae in a cavity about 25 feet (8 meters) up in a birch, Betula nigra
. He reared three to adulthood.
A correspondent of his reports that the adults come to antifreeze traps set out in woodlands.
Harpootlian p. 122, fig. 240 (2)
, see errata
for note on range
Hicks, S.D. 1957. Distribution and Occurrence of Gnomnella maculosa
(Knoch). The Canadian field-naturalist 71: 199-200 (Biodiversity Heritage Library
Hicks, S.D. 1960. Canadian specimens of Gnorimella maculosa (Knoch) (Scarabaeidae) with notes on variation. The Coleopterists Bulletin 14: 91–93.
Ritcher, 1966. White grubs and their allies. Oregon State University Press. Describes two third-instar larvae, collected in November from Redbud, Plummer's Island, Maryland. Original reference for association with Cercis canadensis
Staines, C.L., Jr. 1989. Observations on Gnorimella maculosa (Coleoptera: Scarabaeidae: Cetoniinae). Maryland Entomologist 2: 79–89.
Insects of Quebec
--photos of specimens, showing sexual dimorphism