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Photo#101340
Andrena (Trachandrena) - Andrena fuscicauda - female

Andrena (Trachandrena) - Andrena fuscicauda - Female
Mill Creek Summit area, ~5000 ft. altitude, San Gabriel Mountains, Los Angeles County, California, USA
April 2, 2007
Size: ~9mm
Getting nectar in Rhus trilobata (Skunkbrush). The cinnamon red of the thorax, and last abdominal segment were luminous when I looked at this slender little bee (diameter of the flowers is slightly less than 2mm).
Facial foveae seem to indicate an Andrena.

Images of this individual: tag all
Andrena (Trachandrena) - Andrena fuscicauda - female Andrena (Trachandrena) - Andrena fuscicauda - female Andrena (Trachandrena) - Andrena fuscicauda - female

Moved

Andrena fuscicauda
The critical character is lack of pale tergal hair bands (these present in salicifloris).

Red hairs are more typical of fuscicauda, and this species is better known in that part of S. California (see maps in LaBerge, 1973).

 
Thanks John,
for getting back to this and sharing the character information. I just noticed that I had not yet posted one of the males I photographed in the same shrub, same day.
Just posted:

Moved
Moved from Andrena.

Andrena (Trachandrena)
female

either A. salicifloris or A. fuscicauda. Need to check specimens from LA County (these species vary in color across their range).

Same subgenus as the Palearctic A. haemorrhoa

 
Subgenra list
University of Kansas has a detail list but it shows Andrena (Biareolina) haemorrhoa - should it be Andrena (Trachandrena) haemorrhoa? Where can I find current list of Andrena subgenra?

 
yes, it should be
Andrena (Trachandrena) haemorrhoa (Fabricius, 1781)

At present these is only one species in subgenus Biareolina:
Andrena (Biareolina) lagopus Latreille, 1809

In the past Trachandrena has been included as a syn. of Biareolina.

The Andrena catalog citation is:
Gusenleitner, F., and M. Schwarz. 2002. Weltweite Checkliste der Bienengattung Andrena mit Bemerkungen und Ergaenzungen zu palaearktischen Arten (Hymenoptera, Apidae, Andrena). Entomofauna Supplement 12: 1-1280.

You can search on all bee subgeneric names in my guide:
http://www.discoverlife.org/mp/20q?guide=Apoidea_species

 
Thank you!
Thanks for the information and the link to your guide. I have used it and it is very useful to find species if I have the subgenera. Is there a way to find the subgenera if all I have is the species name? For example: is there a way to use your guide to find the subgenus of Andrena perplexa without looking at every subgenus? Thanks again...

 
Interesting, & thanks
for this information, John!
Time to go up to find an actual specimen, so it can be compared to the two candidate spp. you mentioned: A. salicifloris & A. fuscicauda.

 
Thanks John,
your help and knowledge is indeed tremendous! Thanks also to Richard for his comments.
Moving to genus until I've looked at the two species (A. salicifloris and A. fuscicauda).

 
Thanks for the info
John, your knowledge of the bees is simply impressive.

I agree - Andrena sp.
So strongly similar to Palaeartic Andrena haemorrhoa (= A. albicans) that I wonder wether this specimen does not belong to a mere subspecies, or else is from a introduced population.

 
only three Andrena species are shared
between the Old World and New:

barbilabris, clarkella, and the introduced wilkella

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