Description

The southern carpenter bee is one of two large carpenter bee species native to Louisiana. Adults differ in appearance depending on sex (sexual dimorphism). Females are generally 15 mm to 18 mm in body length. Males are slightly larger, 20 mm to 22 mm in length. Females possess black heads with deep blue and black reflections. The thorax, abdomen and legs are bright bluish purple. In contrast, the heads of males are yellow and covered with whitish hairs. The abdomen is green, and the thorax and legs are also coated in pale hairs. Both sexes have violet tinted wings, though the males’ wings appear somewhat lighter. Larvae have not been described for this species. However, traits apply broadly across the genus. Larvae are C-shaped, creamy white legless grubs, and reach up to 25 mm in length.

Carpenter bees are often mistaken for bumblebees. Although they are similar in size, key differences distinguish them. Bumblebees have smaller heads, hairy abdomens with yellow markings and large pollen baskets on the hind legs. Bumblebees are also social insects that live in colonies, while carpenter bees are solitary.

Xylocopa contains more than 400 species worldwide, with nine species occurring in the United States. Of these, only two species are found in the eastern United States. Xylocopa micans, the southern carpenter bee, is restricted to the southeastern states, ranging from Texas to Virginia. It is also found south to Central America. Xylocopa virginica, the eastern carpenter bee, occurs throughout the eastern states. Both occur in Louisiana, although X. micans are not as commonly encountered. The two species are similar in appearance, but the southern carpenter bee can be distinguished by its paler yellow hairs, wider eye spacing and black antennal scapes. Southern carpenter bees have not been documented nesting in the structural timbers of buildings. Only two nests of the southern carpenter bee have been described, by Hurd in 1958 and Grissell in 1975.

Life Cycle

Little is known of the life history of X. micans. However, there is much knowledge about other species in Xylocopa on which to extrapolate. Carpenter bees undergo four developmental life stages, as with all insects having complete (holometabolous) metamorphosis. These include egg, larvae, pupa and adult. Eggs are laid in a brood cells that are constructed by the adult females after overwintering. After laying each egg the female forms a ball composed of pollen mixed with regurgitated nectar for the larvae to feed on. Then she seals the chamber with chewed wood fibers. Larvae remain within their brood cells, and the adult female supplies them with nectar. Growth and pupation are completed within these chambers. Once they emerge as adults, carpenter bees are capable of flight within a few days. Carpenter bees develop from egg to adult in about seven weeks.

Although matings of southern carpenter bees have not been thoroughly observed, several aspects of its courtship behavior have been documented. Like all carpenter bees, the males are highly territorial when it comes to mating. Southern carpenter bees are known to establish territories that are fiercely defended. When males encounter other males, they engage in chases, maintaining distances of 15 cm and rarely making contact. Each exchange can last for around 30 seconds and on rare occasions the intruder can usurp the original male. When territories are close to each other, males have been known to slowly approach their neighbor to agree on an established boundary. This reduces the amount of energy expended on defense. Interference of territories by other insects may be investigated by males and usually end in swift departure of intruders.

Southern carpenter bees have been observed to engage in two forms of mating strategies. In the early spring, males structure their territories around dense patches of flowers where females are actively foraging. When a female enters his territory, the male follows her in a slow, persistent pursuit. During this time males may engage in multiple couplings. Later in the season, males shift mating strategies. Southern carpenter bees construct territories on elevated vegetation such as levees and mounds. When a female crosses into a territory, the male rapidly pursues her, sometimes mating in the air or on the ground. Both females and males have been observed declining engagement of the other sex.

Ecological Importance

The southern carpenter bee is an important native pollinator in the southeastern United States. Adults use buzz pollination, a resonate vibration that allows them to release pollen from deep inside flowers. Only this and one other bee species in this region use the technique. Both males and females visit a wide variety of flowers and fruits, actively consuming nectar as they forage. Adults are industrious pollinators of urban edge habitats, which typically receive fewer bees relative to nonurban habitats. Southern carpenter bees have also been observed in threatened native habitats such as blackland prairies in Arkansas. Carpenter bees contribute to the breakdown of decaying or deadwood through their nesting activity. Unlike the eastern carpenter bee, the southern carpenter bee does not nest in structural wood and is not considered a pest.

References

Ackerman, J.A. 1916. The Carpenter-Bees of the United States of the Genus Xylocopa. Journal of the New York Entomological Society. 24:3: 196-232.

Gordon, W.F., S.B. Vinson, and A. Lewis. 1979. Territorial Behavior in Male Xylocopa micans (Hymenoptera: Anthophoridae). Journal of the Kansas Entomological Society 52: 313-323.

Grissell, E.E., 1975. The Carpenter Bees of Florida I. Xylocopa. Florida State Collection of Arthropods. 160. (accessed 12 February 2026).

Grissell, E.E., M.T. Sanford, and T.R. Fasulo. 1999. Large Carpenter Bees, Xylocopa spp. (Insecta: Hymenoptera: Apidae: Xylocopinae) University of Florida IFAS Extension. (accessed 12 February 2026).

Liu, H., and S. Koptur. 2003. Breeding system and pollination of a narrowly endemic herb of the Lower Florida Keys: impacts of the urban-wildland interface. American Journal of Botany. 90: 1180-1187.

Remko L., and K. Hogendoorn. 2008. Correlated evolution of mating behavior and morphology in large carpenter bees (Xylocopa). Apidologie 39: 119-132.

Warriner, D.M. 2010. A Range Extension for the Large Carpenter Bee Xylocopa micans (Hymenoptera: Apidae) with Notes on Floral and Habitat Associations. Journal of the Kansas Entomological Society 83: 267-269.

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Adult Xylocopa micans. Photo by iNaturalist user cpgibson

Adult female Xylocopa micans. Photo by iNaturalist user sarinole