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a spider egg nest?

a spider egg nest?
Craggy Rocks, Winneshiek County, Iowa, USA
May 29, 2016
Size: 4- mm without silken ends
May 29, 2016: collected what might be a silken spider egg sac, covered with sand, on the stem of Grove Sandwort, Moehringia lateriflora.
(Thanks to several members of the Iowa Native Plant Society for the plant ID.)
a similar undetermined sand covered silk

I was hopeful that something would emerge from the neat little bundle even though there appeared to be a hole on one side
June 23, 2016: 3 dead wasps, and what special wasps they are

checked the jar more carefully and found another silken sac on the back side of one of the leaves

Images of this individual: tag all
a spider egg nest? a spider egg nest ? a spider egg nest ? Spider egg case, opened Spiderling

Moved from ID Request.

Must be... possibly Agroeca?

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