Many thanks to Messrs. Wesselman & Kroll for clarifying the meaning of this
elusive word. It appears in the heading of Middendorff's treatise on bird
migration in Russia
(St.Petersburg, 1855) as "Die Isepiptesen Russlands." I still don't have
a one-word
definition so "lines on maps showing bird migration" will have to
do. Again, my thanks.
Norman Kane
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