Work in progress
S. torvus
Hind femur 3/4 black from base
https://bugguide.net/node/view/1371184/bgimage
https://bugguide.net/node/view/1449626/bgimage
https://bugguide.net/node/view/910105/bgimage
https://bugguide.net/node/view/1791203/bgimage
https://bugguide.net/node/view/1201263/bgimage
S. ribesii
Male hind femur 3/4 black from base
https://bugguide.net/node/view/1302736/bgimage
https://bugguide.net/node/view/1060367/bgimage
https://bugguide.net/node/view/982474/bgimage
https://bugguide.net/node/view/1021446
https://www.inaturalist.org/observations/32790751
S. knabi
M "hind femur yellowwith apical half mostly brownish"
https://bugguide.net/node/view/1542944/bgimage
https://bugguide.net/node/view/1405860/bgimage
https://bugguide.net/node/view/31751/bgimage
https://www.inaturalist.org/observations/17376379
https://bugguide.net/node/view/1109151/bgimage
https://bugguide.net/node/view/1493264/bgimage, https://bugguide.net/node/view/1328499/bgimage
S. rectus
Male hind femur 2/3 to 3/4 black from base
https://www.inaturalist.org/observations/7413694
https://bugguide.net/node/view/912947/bgimage
https://bugguide.net/node/view/474223/bgimage
S. vitripennis
Male not separable from S. rectus
https://bugguide.net/node/view/876186/bgpage
https://bugguide.net/node/view/1655754/bgimage
https://bugguide.net/node/view/1596113/bgimage
https://bugguide.net/node/view/1505795/bgimage
https://www.inaturalist.org/observations/33738216
S. opinator
Not separable from S. intricatus if both are valid species?
https://bugguide.net/node/view/1614867/bgimage
https://bugguide.net/node/view/169722/bgimage
https://bugguide.net/node/view/1029234/bgimage
https://bugguide.net/node/view/792916
Lots of sad unresolved conversations: https://bugguide.net/node/view/241862/bgimage
https://bugguide.net/node/view/268287/bgimage
https://bugguide.net/node/view/264398
S. sexmaculatus
S. attenuatus
S. currani
S. sonorensis?
S. dimidiatus
S. doesburgi
S. monoculus
Sources
Comentarios
I've noticed that S. knabi seems to have strong yellow sides to the scutum, unlike other Syrphus spp. Is that correct?
Yep, Bill mentions that in several of the BugGuide observations linked above.
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