June beetles

Definition

Common name for several scarab beetles (family Scarabaeidae) that emerge in early summer in temperate North America, particularly species of Phyllophaga (the true May or June beetles) and Cotinis nitida (the green June beetle). Adults are typically nocturnal, attracted to lights, and feed on foliage or ripening fruit; larvae (white grubs) are soil-dwelling root feeders. The name reflects seasonal phenology rather than a formal taxonomic group.

Etymology

From the month of June, when adults of temperate North American species typically emerge and become conspicuous.

Example

In the Midwest United States, June beetles (Phyllophaga spp.) often defoliate oak and hickory trees in late May and early June, while the larger, metallic-green Cotinis nitida congregates on ripening peaches and figs in July.

Synonyms

• May beetles
• June bugs

Related Terms

• Scarabaeidae
• white grubs
• Phyllophaga
• Cotinis
• Phenology
• root-feeding larvae
• Scarab beetles
• Chafers

Usage Notes

The term is phenological and vernacular, not taxonomic; 'June beetle' may refer to different species in different regions. In the eastern United States, it usually means Phyllophaga species, while in the Southeast, Cotinis nitida is often called 'green June beetle.' 'May beetles' is frequently used interchangeably for Phyllophaga species that emerge in late May. The name 'June bug' is more colloquial and may also refer to other scarabs or even non-scarab beetles such as fireflies (Lampyridae) in some dialects.