Hair - Where the Density control went to in 2.78?

I just want to limit the hair growth to a Vertex Group. I was following this instructions, but I can’t find “Density in the Influence section” as mentioned in point num 5.
Where did it go to?

I then went and tried accomplishing the same with Weight Painting as suggested lower in the same page, but it’s simply not painting :rolleyes:

Thanks guys,

JDL