Bob, It's hard to see the pm line on your moth which is the best way to separate denticulata from strigataria. Both broadly overlap in FW length though strigataria tends to average slightly smaller and strigataria also seems to fly a little later than denticulata but broad overlap here as well. You don't say when the photo was taken but I assume recently. I'm leaning towards strigataria based on what appears to be a shallowly scalloped pm line but again, its hard to see on your moth. The Rindge paper (link at bottom of BugGuide P. denticulata page) is a helpful reference. Looking at the images on the Bugguide P. denticulata page, several appear to me to be strigataria including an image from Marvin Smith--note the nearly straight pm line. Also look at the image here with a side-by-side comparison of denticulata and strigataria: http://www.mothguide.com/Geometridae/display_moth.php?genus=Phigalia&species=strigataria # Hope this helps. Merrill On Mon, Feb 27, 2012 at 9:03 PM, Bob Perkins <perkybear@xxxxxxxxxxxxxx>wrote: > Last year I ended the spring season with a number of Phigalia spp. photos. > I seem to be going in the same direction this year. I'm hoping that having > the ruler (mms) to the image may help. > > Bob > > > ------------------------ > Bob Perkins > Woodlawn, Virginia > Historian and General Outdoorsman > > > > > > -- J. Merrill Lynch Echo Valley Farm Watauga County, NC Elevation: 3,400 feet