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TaxonomyBrowseInfoImagesLinksBooksData
Photo#459541
Black and Yellow Mud Dauber? - Sceliphron caementarium - female

Black and Yellow Mud Dauber? - Sceliphron caementarium - Female
Claremont, Los Angeles County, California, USA
September 25, 2010
This wasp was spotted at about 9 am in the mud at the edge of the 'lake' at the Claremont Colleges' Robert J. Bernard Biological Field Station rolling up balls of mud then flying off with them. I am wondering if this could be a Black and Yellow Mud Dauber, Sceliphron caementarium?

I noted this wasp has a predominantly yellow pedicel, and that others have noted S. caementarium with yellow pedicels from coastal southern California, e.g.:



Any confirmation or correction will be greatly appreciated!

Images of this individual: tag all
Black and Yellow Mud Dauber? - Sceliphron caementarium - female Black and Yellow Mud Dauber? - Sceliphron caementarium - female Black and Yellow Mud Dauber? - Sceliphron caementarium - female Black and Yellow Mud Dauber? - Sceliphron caementarium - female

Moved

Black & Yellow Mud Dauber
looks right to me.

 
Question...
This much yellower form of S. caementarium, is it because it's a more xanthic form... the ones we get here have no yellow spots on the Episternum,Propodeum,Pronotum and on the 1srt or 2nd tergum of the gaster... so this might be because they are more melanic... I live in Ottawa, Canada, a more northern/colder climate so this might explain why....?

Thanks

 
Definitely seems to be a trend
There definitely seems to be regional color variation. Eric Eaton commented here that "Northern specimens are much more 'black' than southern specimens. Most of the ones here in Tucson, for example, have a yellow petiole."

If you use the BugGuide Advanced Search feature to search for Sceliphron caementarium in Southern California (e.g., Los Angeles or Orange County) or in Arizona, you can see they're all of the yellowish sort, whereas all the ones from Ontario are quite dark. The ones I looked at from Florida, however, are dark, so maybe the xanthic form is restricted to the southwest, rather than just correlating with warm temperatures. It would be interesting for someone to look at the color pattern distribution more carefully.

 
Thanks!
Thanks for the ID confirmation! This is a new taxon for our field station invert list.

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