HomeGuideID RequestRecentFrassForumsDonateHelp

Clickable Guide

Interactive image map to choose major taxa

Calendar

Upcoming Events

National Moth Week was July 19-27, and the Summer 2025 gathering in Louisiana, July 19-27

Photos of insects and people from the 2024 BugGuide gathering in Idaho July 24-27

Moth submissions from National Moth Week 2024

Photos of insects and people from the 2022 BugGuide gathering in New Mexico, July 20-24

Photos of insects and people from the Spring 2021 gathering in Louisiana, April 28-May 2

Photos of insects and people from the 2019 gathering in Louisiana, July 25-27

TaxonomyBrowse

Info

ImagesLinksBooksData

Home » Guide » Arthropods (Arthropoda) » Hexapods (Hexapoda) » Insects (Insecta) » Ants, Bees, Wasps and Sawflies (Hymenoptera) » Aculeata - Ants, Bees and Stinging Wasps » Apoidea (clade Anthophila) - Bees » Leafcutter, Mason, and Resin Bees, and allies (Megachilidae) » Leafcutter, Resin, Mortar, Sharptail, Mason, and Woolcarder bees and relatives (Megachilinae) » Mason bees and relatives (Osmiini) » Chelostoma » Subgenus Prochelostoma (Chelostoma Subgenus Prochelostoma) » Chelostoma philadelphi

Species Chelostoma philadelphi

What is it? - Chelostoma philadelphi - male

One on asters - Chelostoma philadelphi - male

small black fly - Chelostoma philadelphi

Chelostoma philadelphi - Chelostoma philadelphi - female

Ant-like Bee - Chelostoma philadelphi? - Chelostoma philadelphi - female

Classification

Kingdom Animalia (Animals)

Phylum Arthropoda (Arthropods)

Subphylum Hexapoda (Hexapods)

Class Insecta (Insects)

Order Hymenoptera (Ants, Bees, Wasps and Sawflies)

No Taxon (Aculeata - Ants, Bees and Stinging Wasps)

No Taxon (Apoidea (clade Anthophila) - Bees)

Family Megachilidae (Leafcutter, Mason, and Resin Bees, and allies)

Subfamily Megachilinae (Leafcutter, Resin, Mortar, Sharptail, Mason, and Woolcarder bees and relatives)

Tribe Osmiini (Mason bees and relatives)

Genus Chelostoma

No Taxon (Subgenus Prochelostoma)

Species philadelphi (Chelostoma philadelphi)

Synonyms and other taxonomic changes

Heriades philadelphi Robertson, 1891; Prochelostoma philadelphi (Robertson, 1891)

Explanation of Names

Author: Robertson, 1891

Size

Female 8mm, male 6-7mm

Identification

Chelostoma are longer than most Osmini because of their elongated thorax. Identifying this genus means noticing where the tegula lie in relation to the thorax. Pretend you are drawing a "+" on the thorax. The ends of Chelostoma tegula (that part closest to the wings) are about midway as shown in this photo

whereas in other Osmini the tegula ends are lower on the thorax as shown in this photo

(1)

Range

Illinois and Michigan to Connecticut, south to Georgia.

Discover Life Map

Season

March to July.

Food

Includes Philadelphus. The Hosts section on its Discover Life species page lists known floral associations based on specimen records and images.

Remarks

Native species. The other two species in this genus in the area are introduced.

Internet References

Discover Life

Works Cited

1.	The Bees in Your Backyard: A Guide to North America's Bees. Joseph S. Wilson & Olivia J. Messinger Carril. 2015. Princeton University Press.

Contributed by Beatriz Moisset on 27 May, 2008 - 7:06pm
Additional contributions by John S. Ascher, hg, Marci Hess, PaleoJon
Last updated 20 April, 2023 - 9:38pm

Disclaimer: Dedicated naturalists volunteer their time and resources here to provide this service. We strive to provide accurate information, but we are mostly just amateurs attempting to make sense of a diverse natural world. If you need expert professional advice, contact your local extension office.

Contributors own the copyright to and are solely responsible for contributed content.
Click the contributor's name for licensing and usage information.
Everything else copyright © 2003-2025 Iowa State University, unless otherwise noted.

Bugguide is hosted by:

Printer Friendly Version