Banded Alder Borer

Like many other species in the family Cerambycidae, R. funebris has strikingly colored wing covers (elytra). The elytra are dark with three white bands. The thorax (pronotum) is white with a large black spot. The alder borer's antennae are banded white and black. The male's antennae are longer than the body; the female's are shorter. Long and narrow, the body of R. funebris may grow to be 38 millimetres (1.5 in).

They are found in western North America, from Alaska through California, and in New Mexico. The banded alder borer may be found in the spring and summer on the bark of alder trees. The exact reason is unknown, but R. funebris is drawn to recently painted buildings and may be found, in multitudes, resting on the paint.

Most mature Cerambycidae feed on flowers. The larvae consume wood. Rosalia funebris generally lays its eggs on downed trees rather than living trees, so it is not considered a significant pest.