Maybe of interest...
Mikel Koven has this to say in his book La Dolce Morte on the giallo filone (free translation:movement):
"There are several different kinds of gialli....While the classical giallo features a serial killer clad in black gloves,hat,and overcoat being hunted by an amateur detective,the poliziotto puts the police investigation front and center in the investigation.
Other gialli tend to focus on more private and interior settings,creating more of a suspense giallo.
Still others,embracing the strong connection between the giallo and the horror film,offer a more supernatural narative,the giallo-fantastico.
What we mean by giallo,then is quite a broad spectrum of films,despite their formulaic narratives."
So I made this division:
Classical giallo (Blood and Black Lace,The Bird with the Chrystal Plumage,Who Saw Her Die?...)
Poliziotto giallo (Black Belly of the Tarantula,Death Occurred last Night,So Sweet,So Dead...)
Suspense giallo (The Sweet Body of Deborah,Orgasmo,Perversion Story...)