I have used locus to counter the hog hornet strat a lot but you do need some hunters as well.  Im not sure what FJ is talking about how one locus cannot hit one hog...who cares.  Its irrelivent.  Who is going to have 1 locus vs 1 hog.  Locus is low numbers suck.  If you get 6+ together they rape hogs for one main reason.  People with hogs drive them around like crazy so they cannot focus fire on one locus.  Instead they just pound on shields while the locus just tear them to pieces.  Plus the hogs cannot get out of range of the locus since range wise locus>hogs.  I said you need a few hunters so the hogs cannot get close.  It keeps them at the end of the hogs range so maybe all of his hogs are not shooting but all of your locus are picking hogs off left and right,  Locus + hunters(or whatever unit your countering with) + leader is fun strat to use. 

I mainly use the locus strat on a reactor map but it is possible to have them around 4:20 on non reactor map if you dont get attacked to much.  This is with citadel build.  There are probably faster ways but if it doesnt work at least you have an eco to fall back on.