I don't think so...Check out the spring form of Mustard White on the Butterfllies of America website:
In Peter's specimen, there is no evidence of (sharper) dark scaling along the veins of the FW apex and on the HW. Also, the rounded FW apex and the "dirty" whitish ground color do suggest WV White...Now, if we had a shot of the underside then we would know for sure...

From: Vermont Butterfly Survey [[log in to unmask]] On Behalf Of Alan [[log in to unmask]]
Sent: Monday, April 16, 2012 8:38 PM
To: [log in to unmask]
Subject: Re: Butterflies at Henry Potters Cobble Wallingford Vt

My best guess is Mustard White.
Alan Gregory
Williston VT

On Mon, Apr 16, 2012 at 7:07 PM, Peter Manship <[log in to unmask]> wrote:
I was at this unique habitat looking at some spring wildflowers and noticed a few
butterflies out flying in this very warm day

Red Admiral  1
Eastern Comma  3
Spring Azure 1  on the other side of the road

Mustard White or a West Virginia White

 I got a good image of the butterfly with it's wings open a little, not having a net
I waited for the wings to close to see the pattern and if it was light or dark but
the wind started hollowing and the butterfly was gone. here is the image, what
do you think?

Peter Manship

For the wild...
Alan Clark Gregory
Lt Col USAF, Ret.

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