Family: Megachilidae
Subfamily: Megachilinae
Tribe: Dioxyini
Genus: Eudioxys Mavromoustakis, 1963
Subgenera: none
Common name: none


Eudioxys ranges in length from 6.5–7 mm (Michener 2007). This genus is uncommon.


Eudioxys consists of two species (Michener 2007); none are known to occur in the U.S. or Canada.

Diagnostic characteristics

(modified from Michener 2007 unless otherwise stated)

May be confused with

Eudioxys resembles Dioxys due to the carinate pronotum and omaulus, and similar male genitalia (Michener 2007). Eudioxys can be differentiated from all other Dioxyini by its axilla, which are produced to large, curved spines. They are also the only member of the Dioxyini with the combination of spines on the scutellum and the lack of a median spine on the metanotum.

Known invasives

There are no known invasives.

Host associations

Eudioxys are cleptoparasitic bees, and females do not gather pollen from flowers since the larvae develop parasitically on their host’s pollen provisions (Michener 2007). They will, however, visit a wide variety of flowers for nectar. Eudioxys are known to parasitize other bees in the family Megachilidae (Michener 2007).

Nesting behavior

Eudioxys are known cleptoparasites of bees in the family Megachilidae (Michener 2007). Host selection boundaries, however, are not well understood. In general for bees within the Dioxyini tribe, the female parasite often spends time around the preferred floral resources of its host to locate them. Once a host nest is found, an egg is laid inside a cell as it is being provisioned by the host female (Rozen and Favreau 1967), or it is injected into the cell after it has been sealed off (Rozen and Özbek 2005). After hatching from the egg, the larva is active and has pointed mandibles that are used to destroy the host egg or larva (Rozen and Özbek 2004). The larva retains the somewhat modified “hospicidal” body form for multiple instars before molting into a more ordinary grub-like form where it feeds on the pollen stores of its host (Rozen and Özbek 2004).


Eudioxys occurs in Egypt and Iran (Michener 2007).

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<p><em>Eudioxys schwartzi</em> female lateral habitus, photo: L. Graham</p>
Eudioxys schwartzi female lateral habitus, photo: L. Graham
<p><em>Eudioxys schwartzi </em>female dorsal view of head, thorax, and anterior portion of abdomen, photo: L. Graham</p>
Eudioxys schwartzi female dorsal view of head, thorax, and anterior portion of abdomen, photo: L. Graham