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Photos of insects and people from the 2015 gathering in Wisconsin, July 10-12

Photos of insects and people from the 2014 gathering in Virginia, June 4-7.

Photos of insects and people from the 2013 gathering in Arizona, July 25-28

Photos of insects and people from the 2012 gathering in Alabama

Photos of insects and people from the 2011 gathering in Iowa

Photos from the 2010 Workshop in Grinnell, Iowa

Photos from the 2009 gathering in Washington

unusual Hyalophora cecropia cocoon in MN

On November 7, 2017 I collected an "empty" Hyalophora cecropia cocoon from a dogwood (Cornus sp) in east central MN. It seemed unusually large to me (end-to-end 3.5 inches, maximum lateral profile 1.25 inches). General color and texture suggested formation in 2016 or maybe 2017 (older cocoons get rather 'bald' and pale). The eclosion valve seemed gapped and there was also a small hole (~1/8 inch) in the uppermost opposite end. I was surprised on cutting it open to find no inner layer/bag; also no pupal exuviae, nor evident wasp or fly parasitoid exuviae; only larval exuviae and some (to me) unidentifiable junk.
While I haven't examined all that many Hyalophora cecropia cocoons, I have looked at both baggy and compact versions and cannot recall having seen one without an inner layer. I suppose the prepupal larva may have spun the outer layer and perished before constructing the inner bag? But this may not make sense since the larval exuviae were present, but no pupal exuviae.
Any ideas much appreciated!