Not confident with this one. Tergite 4 looks as if the markings overlap side margin. Safe in Dasysyrphus.

Moved from pinastri group.

Moved from Dasysyrphus.

I can't quite tell if the markings on tergites 3-4 are crossing the abdominal margin or not. It looks more to me like they aren't, but I'll lay out both options just in case :^)

If they are, then I think Dasysyrphus venustus, using the new Locke and Skevington key (Zootaxa 3660, 2013). The maculae on tergites 3-4 fit the description of venustus (venustus is described as the maculae being transverse, constricted slightly medially, medial edge swollen slightly) better than the D. intrudens complex (arcuate/lunulate, U/V shape on anterior edge, constricted in the middle, large swelling on medial edge).

However, if they aren't (which I think more likely), then it's probably one of D. pacificus or D. pauxillus. I can't quite see the gena to see if it's light or dark, but the markings on the abdomen don't match creper (not arcuate with flattened edge), and markings and range don't match richardi or lotus. The markings aren't constricted, and the range and appearance match neither laticaudus (similar appearance, but an eastern species) or nigricornis.
The problem is that pacificus and pauxillus are apparently very hard to tell apart in sympatry, aka southern BC and most probably WA as well. Bummer! pacificus apparently has more bare wings, but I'm bad at judging those and the authors advise caution and prefer genital dissection.

Moved from Syrphini.

Moved from Syrphid Flies.

I think it's Eupeodes, but am not completely certain. Perhaps someone else with chime in.