- Also called May beetle. any of several large, brown beetles of the genus Phyllophaga, of the scarab family, appearing in late spring and early summer.
- green June beetle.
- Chiefly Northern and North Midland U.S. a firefly.
- any of various large brown North American scarabaeid beetles that are common in late spring and early summer, esp any of the genus PolyphyllaAlso called: May beetle, May bug