  In response to a recently reported observation of evidence for two classes of
Type Ia Supernovae (SNe Ia) distinguished by their brightness in the rest-frame
near ultraviolet (NUV), we search for the phenomenon in publicly available
light-curve data. We use the SNANA supernova analysis package to simulate SN
Ia-light curves in the Sloan Digital Sky Survey Supernova Search (SDSS) and the
Supernova Legacy Survey (SNLS) with a model of two distinct ultraviolet classes
of SNe Ia and a conventional model with a single broad distribution of SN-Ia
ultraviolet brightnesses. We compare simulated distributions of rest-frame
colors with these two models to those observed in 158 SNe Ia in the SDSS and
SNLS data. The SNLS sample of 99 SNe Ia is in clearly better agreement with a
model with one class of SN Ia light curves and shows no evidence for distinct
NUV sub-classes. The SDSS sample of 59 SNe Ia with poorer color resolution does
not distinguish between the two models.
