Rosalia funebris

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The banded alder borer (Rosalia funebris) is a member of the very diverse family of longhorn beetles. This information is also on Wikipedia under the same title, Rosalia funebris[1]

Rosalia funebris
Rosalia funebris resting on a finger
Scientific classification
Kingdom: Animalia
Phylum: Arthropoda
Class: Insecta
Order: Coleoptera
Family: Cerambycidae
Subfamily: Cerambycinae
Genus: Rosalia
Species: R. funebris
Binomial name
Rosalia funebris
Motschulsky, 1845



Like many others 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 males antennae are longer than his body, but the female's are shorter.

Long and narrow, the body of R. funebris may grow to be 38mm.

Rosalia funebris in the second before flight.


Located along western North America, Alaska through California, and in New Mexico[2], the banded alder borer may be found in the spring and summer on the bark of alder trees.

The exact reason (pheromone?) is unknown, but R. funebris is drawn to recently painted buildings and may be found, in multitudes, resting on the paint[3].


The adult wood-boring beetles lay their eggs in a crevice of the bark on hardwood trees such as alder and California laurel/Oregon myrtle [4]. From there the larvae bore into the wood.

Unlike the oval (in cross-section) tunnels of the Buprestidae larva, larval Cerambycidae tunnels are circular (in cross-section) and will generally go straight for short distances between turns[5].


Most mature Cermabycidae feed on flowers[6].

The larvae consume wood.

The species generally prefers dying trees, instead of healthy trees, so the alder borer is not considered a pest[7]

Other Rosalia species

  • Rosalia alpina (Linnaeus, 1758) Rosalia longicorn
  • Rosalia batesi Harold, 1877
  • Rosalia coelestis Semenov, 1911
  • Rosalia funebris Motschulsky 1845 Banded Alder Borer
  • Rosalia houlberti Vuillet, 1911
  • Rosalia lameerei Brogn, 1890


  5. Triplethorn, C.A. and Johnson, N.F. (2004). Borror and DeLong's Introduction to the Study of Insects. Thomson Learning.
  6. Triplethorn, C.A. and Johnson, N.F. (2004). Borror and DeLong's Introduction to the Study of Insects. Thomson Learning.