junebug

noun

1. 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.
2. green June beetle.
3. Chiefly Northern and North Midland U.S. a firefly.

noun

1. 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