Hmm, seems like maybe they are not so good to have around. They were very tiny and guess could have been a brownish-red, but they showed up quite easily against the soil.
Will have another look at the w/e and see how many I can spot - the shallots are planted at the base of a fruit tree (apple) ... maybe they're after the tree not the shallots.
Would watering with a bit of fairy liquid help ?