Your fly looks like Adejeania vexatrix, as in this link which is also from Colorado.
Yours also has both orange and black spines like this one. It does seem to fit Adejeania best. The thorax color and pattern also fit. This species also has long palpi in front of the head as does yours. http://www.pbase.com/tmurray74/image/46752147, http://www.cirrusimage.com/flies_Tachinidae_Adejeania.htm
http://en.wikipedia.org/wiki/Adejeania_vexatrix
Comments (10)