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Photo#235327
Efferia Robber Fly - Efferia mortensoni - male

Efferia Robber Fly - Efferia mortensoni - Male
Pino Trail, Sandia Mountains, Bernalillo County, Arizona, USA
October 17, 2008
Size: Medium (1-1/12")
Not sure what species, but I believe this is an efferia robberfly.

Certainly
An Efferia male. The bad news is that is the easy part. Interesting that this is flying in October. Without a wing shot this is tough for us easterners. I wonder though if this is not in the Carinata group. May be keyable if it is. Will have Dr. Fisher take a look.

 
Late flier
The weather was unseasonably warm for the time of year (mid 70s) and the rabbitbrush was in bloom attracting lots of bugs. Those factors may have contributed to it being a late flier.

 
Flights
Still usually spring, summer or late summer in the Efferia from Wilcox's dates. Sometimes two brooded flight times. If this is a Carinata group species then E. jubata and E. prolifica are known fliers in October. E. jubata even recorded into November. Descriptions are close.

 
This is Efferia mortensoni --
This is Efferia mortensoni -- in the pogonias group. This species is typically active from September to late October. It is actually more of a dark grayish fly in color; possibly the contrast has been boosted in this photo.

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