Hind legs, basitarsi, small spine or tooth - Located on underside within the dense brush of hair, about a third of the way from the apical near, but not on the anterior edge - Can be VERY hard to see, look closely
Present, may be minute
In order to find the potentially “minute” tooth of the hind basitarsi, it might be helpful to gently run the point of pin down the anterior face. You may snag on something you can’t see for all the hair. The key is to be gentle!!!