Re: Sulphur ID Help

Kay Carter

Thanks for the help, Bob.




From: <> On Behalf Of tlpyle@...
Sent: Wednesday, August 03, 2022 3:28 PM
Subject: Re: [NorWestLeps] Sulphur ID Help


This is a nice shot of a female Orange Sulphur (Alfalfa Butterfly) Colias eurytheme, Kay. Note the orange flush, which in most of Oregon, only this species normally has. You can tell it's a female by the fenestration (window-spots in the black margin on the upper side, which shows through to the underside in this view. It also shows the brown "eurytheme spots" around the hindwing just in from the edge, though they are very light on this one. This is the only species of sulphur you are likely to see in the western Oregon lowlands, with its numbers increasing in late summer.

The Western Sulphur (C. occidentalis) is largely Cascadian, not a valley butterfly, and it flies earlier. You'll find pretty good shots of both of these in our PNW field guide and on Butterflies of America website.

Bob Pyle



On 2022-08-03 2:16 pm, Kay Carter wrote:

I found this sulphur in Canby (western Clackamas County) Oregon this morning.  I’m leaning towards Western (c. occidentalis) but it seems it might be a bit out of range this far west in the county.  Any help pinning down ID to species would be appreciated.



Kay Carter

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