I have been using the oil of Lemon Eucalyptus (Eucalyptus Citriodora) for many years with great success (25 drops mixed in a 60 ml spray bottle with water). I'm usually a mosquito magnet. But not with this natural oil. I now even use it on my baby with care. I had to special order the oil of Lemon Eucalyptus at Wholefoods because they didn't carry it (but they will gladly order it for you). It only costs about $5 for a .5 FL OZ (15 ml) bottle.
Hope that helps!!
Note: I live in the Dallas area.