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Thanks! Was this in "undetermined" amidst mine or just the identifying's been corrected (can't remember now)?
Your humble servant added a genus for this species few days ago. For that too: http://lepidoptera.ru/species/chrysozephyrus-smaragdinus/. Somehow, photo wasn't applied there.
Hm, looks rather similar to Nemophora degeerella, Linnaeus, 1758? http://lepidoptera.ru/species/nemophora-degeerella/.
http://lepidoptera.pro/species/hyphantria-cunea/ Feeds on cottonwood too. Young caterpillars live socially in the beginning. So that's the puzzle. http://natlands.typepad.com/nlt_preserve_blog/2009/08/crows-nest-caterpillars.html A larger photo of this caterpillar needed.
Please, don't. This is the very cottonwood: http://www.colostate.edu/Dept/CoopExt/4dmg/Trees/cotton.htm. But there are many more species that make nests over there. Rather "uncertain".
I don't think so: http://blog.naver.com/PostView.nhn?blogId=a6m0ze&logNo=130018277976&categoryNo=35&viewDate=¤tPage=1&listtype=0.
Meh, I hurriedly comment it yesterday so that seemed vague. Nothing's wrong: the photo I linked as an example is a 100% sure S. lubricipeda caterpillar, that's all.
Young Phragmatobia fuliginosa (Linnaeus, 1758): http://www.european-lepidopteres.fr/Phragmatobia-fuliginosa.html.
I've just got that link. Also, the same in a David Carter book, "Butterflies & Moths" Dorling Kindersley, London 1992 (a photo of a caterpillar what has this clearly seen red stripe).
The only one, true S. lubricipeda is there: http://www.biolib.cz/en/image/id42955/. The rest of caterpillars aren't. Tomorrow will try to clear it up (out for a day).
To "uncertain" (photo seems from Yankeeland). Can't add synonyms: Actias bolli (Wagner, 1876) Actias maasseni, Kirby, 1892 Actias rossii, Ross, 1872 Phalaena luna, Linnaeus, 1758.