I didn't think they were sawfly eggs purely because of the shape. I don't now if different types of sawfly produce different shape eggs but the sawfly eggs I have noted in the garden are and smooth, the same sort of shape as ladybird eggs but white, where these where more ridged spherical and white
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Here is a picture of some sawfly eggs.
http://www.wildabouttheworld.com/gallery/data//504/thumbs/2007-04-28_Sawfly_Larvae_2.jpg