Hylaeus schwarzii

(Cockerell, 1896)

Schwarz's Masked Bee

Hylaeus schwarzii is a of masked in the , to North America. Like other members of the Hylaeus, it is a solitary, nearly hairless bee that superficially resembles small . The species was described by Cockerell in 1896 and is one of approximately 50 Hylaeus species occurring in North America. Very little species-specific information is documented for H. schwarzii; most knowledge of its biology is inferred from the broader genus.

Hylaeus nelumbonis, f, face, Minnesota 2018-07-17-16.22.57 ZS PMax UDR (51407406807) by USGS Bee Inventory and Monitoring Lab from Beltsville, Maryland, USA. Used under a Public domain license.Schwarz's Masked Bee by Sandra H Statner. Used under a CC BY 4.0 license.Hylaeus nelumbonis, f, left, Minnesota 2018-07-17-16.34.04 ZS PMax UDR - Flickr - Sam Droege by USGS Bee Inventory and Monitoring Lab from Beltsville, Maryland, USA. Used under a Public domain license.

Pronunciation

How to pronounce Hylaeus schwarzii: /hɪˈliːəs ˈʃvarts.i.aɪ/

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Identification

Hylaeus schwarzii is a small, nearly hairless with reduced that creates a -like appearance. Females typically display pale or yellowish markings on the inner margins of the , while males have more extensive or coloration across the entire —the characteristic "masked" pattern for which the is named. Definitive -level identification requires examination of microscopic morphological characters and is best confirmed by a taxonomist. The bee lacks the dense, branched () hairs typical of most bees; at 60× magnification or higher, this hair distinguishes Hylaeus from similarly hairless wasps.

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Distribution

North America. Specific range details within this region are not well documented in available sources.

Ecological Role

As a member of the Hylaeus, H. schwarzii likely functions as a , though this has not been confirmed at the level. The genus as a whole contributes to of various flowering plants, with some species showing preference for particular when available.

Similar Taxa

  • Hylaeus modestusAnother small North masked with similar -like appearance and facial markings; requires microscopic examination to distinguish
  • Other Hylaeus speciesApproximately 50 occur in North America, many sharing the characteristic reduced hair and facial mask pattern; species boundaries are subtle and require identification
  • Small sphecid wasps (e.g., Crabronidae)Superficially similar in size, coloration, and hairlessness; distinguished by hairs in (visible at 60× magnification) and by behavioral differences

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Sources and further reading