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We present an analysis of the galactocentric distributions of the "normal"and peculiar "91bg-like" subclasses of 109 supernovae (SNe) Ia, and study theglobal parameters of their elliptical hosts. The galactocentric distributionsof the SN subclasses are consistent with each other, and with the radial lightdistribution of host stellar populations, when excluding bias against centralSNe. Among the global parameters, only the distributions of u-r colours andages are inconsistent significantly between the ellipticals of different SN Iasubclasses: the normal SN hosts are on average bluer/younger than those of91bg-like SNe. In the colour-mass diagram, the tail of colour distribution ofnormal SN hosts stretches into the Green Valley - transitional state of galaxyevolution, while the same tail of 91bg-like SN hosts barely reaches thatregion. Therefore, the bluer/younger ellipticals might have more residual starformation that gives rise to younger "prompt" progenitors, resulting in normalSNe Ia with shorter delay times. The redder and older ellipticals that alreadyexhausted their gas for star formation may produce significantly less normalSNe with shorter delay times, outnumbered by "delayed" 91bg-like events. Thehost ages (lower age limit of the delay times) of 91bg-like SNe does not extenddown to the stellar ages that produce significant u-band fluxes - the 91bg-likeevents have no prompt progenitors. Our results favor SN Ia progenitor modelssuch as He-ignited violent mergers that have the potential to explain theobserved SN/host properties.

Supernovae and their host galaxies -- VI. Normal Type Ia and 91bg-like supernovae in ellipticals