Physoconops gracilis

From Camras : This species replaces brachyrhynchus in the western United States, and differs typically in being predominantly reddish with pleural stripe golden, front entirely yellow [but sometimes darkened in the center, see below], and absence of spot in facial grooves. However, most specimens show a trace of the spot in the facial grooves and in some it is very distinct. From Camras & Hurd: In addition to the key characters [frons and cheeks yellow, 1st posterior cell (R5) partly darkened] of this predominantly reddish species, the second and third antennal segments are subequal, the genital plate of the female is short, and there is no distinct postvertical pollinose stripe. The front is sometimes darkened in the center, and the facial grooves sometimes have dark marks at the oral keel, thus showing variation toward the eastern P. brachyrhynchus which it replaces in the western United States.