ClipArt ETC
"The female is chiefly luminous. It is a flat, grayish-brown creature, rather more than half an inch long, and quite destitute of wings. The male, on the contrary, is active, and flies well; and the luminosity of the emale appears to be intended to attract her volatile companion." — Goodrich, 1859

Glowworm

"The female is chiefly luminous. It is a flat, grayish-brown creature, rather more than half an inch…