The hind legs are more slender and less hairy than those of the female, see: http://media.padil.gov.au/Species/138279/15986-large.jpg http://media.padil.gov.au/Species/138279/15979-large.jpg The definitive test is counting the number of antennal segments or getting a good look at the face. Only the male has a pale yellow patch on the lower edge of the head seen from the front.