Numerous specimens, Colorado. The commonest Syrphid of the mountain meadows. Some specimens have very indistinct brownish spots on the second abdominal segment, and, when this is the case, the middle of the wing generally shows a brown spot, and brown clouds along the anterior veins between the spot and the base of the wing.
Eristalis brousi Williston.
One male specimen, Colorado.
Helophilus latifrons Loew.
Numerous specimens, Colorado.
Xylota flavitibia Bigot.
Eight specimens, Colorado. The glistening pile of the face and front varies from white to a golden yellow. On the dorsum of the thorax purplish stripes are distinctly visible. The fourth segment of the male abdomen is often red, as in the female abdomen.
Syritta pipiens Linne.
Eight specimens, Colorado.