Infertile eggs are not that infrequent, perhaps especially after hot weather flight seasons. Either that or I find every one laid...
This egg is empty. I bunged it under the microscope at x 60 and couldn't find any hole, so it hadn't been sucked (by a weevil, or other malicious invertebrate). The conclusion is that a male was firing blanks, or a female had run out of sperm...
(Fermyn Woods, 20th Aug 2015 - and I saw 14 Silver-washed Fritillaries, 2 old Ringlet and, incredibly, 2 old Large Skipper - my first of the month).
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