Sighting Record for Utah

Common name:	Pacific-slope Flycatcher
Scientific name:	Empidonax difficilis
Date:	8/23/15
Time:	8:57 am
Length of time observed:	Observed: 30 sec
Number:	1
Age:	?
Sex:	?
Location:	Lytle Ranch
County:	Washington
Latilong:	(37.0933, -113.9493)
Elevation:	2800 ft
Distance to bird:	25 feet
Optical equipment:	None
Weather:	Partially Sunny
Light Conditions:	Decent, not too harsh light.
Description: Size of bird:
(Description:) Basic Shape:
(Description:) Overall Pattern:
(Description:) Bill Type:
(Description:) Field Marks and Identifying Characteristics:	I did not visually observe this bird as it was hidden in a tree. I recorded its song as soon as I heard it singing.
Song or call & method of delivery:	Song was a 3 part sequence- tsip, klseewii, ptik. The ptik note had the first syllable lower than the second (which is the reverse of a Cordilleran.
Behavior:	Sung for about 15 seconds before going silent.
Habitat:	Desert riparian.
Similar species and how were they eliminated:	Cordilleran and Pacific-slope are identical in appearance. The only sure fire way to tell them apart is by voice. Earlier in May I recorded a call note of a Pacific-slope, which is hard to differentiate from a Cordilleran. Looking at the sonogram of the call, it shows that all 3 elements of the song match up with a Pacific-slope Flycatcher rather than a Cordilleran. I uploaded my song to xeno-canto so I could view the sonograms. Here is a sonogram of the song of my flycatcher: http://www.xeno-canto.org/269953 Here is a song of a PSFL from near San Diego: http://www.xeno-canto.org/124972 Finally a sonogram of a COFL from Colorado: http://www.xeno-canto.org/253552 [Here's the unedited recording; http://www.xeno-canto.org/288020] Visually, the first note of a PSFL just rises vs rising and falling in a COFL. The second note of a PSFL sharply rises before abruptly dropping and then rising sharply again; with a COFL the second note has a longer first rise with it curving down and then briefly rising again. Finally the 3rd note of a PSFL looks like a straight up and down line with the 3rd note of a COFL showing 2 parts. More research is needed but it would appear that Pacific-slope Flycatcher is an uncommon migrant through desert lowlands of southwestern Utah where as Cordilleran Flycatcher prefer to migrate in highlands.
Previous experience with this & similar species:	I have seen and heard Pacific-slope Flycatchers several times before in Washington and Utah.
References consulted:	Sibley's 2nd edition. Xeno-canto
Description from:	Notes taken at the time of the sighting
Observer:	Kenny Frisch
Observer's address:	4609 S Wallace Ln Holladay, UT
Observer's e-mail address:	**
Other observers who independently identified this bird:
Date prepared:	8/25/15
Additional material:
Additional_Comments: