Just to correct my earlier assertion, the mature male is capable of feeding. He just lacks the 'teeth' on the end of his chelicerae so relies on mum (as do his sisters as theirs aren't mature or tough enough) to make that feeding hole.

http://www.ask-force.org/web/Bees/Ro...arroa-2010.pdf

To add to the poor fellow's woes, apparently he has only one testis. Probably has to put up with his sisters singing songs about German dictators with an allegedly similar condition.