  We present a far-ultraviolet (FUV) spectral atlas consisting of spectra of 91
pre-main sequence stars. Most stars in this sample were observed with the Space
Telescope Imaging Spectrograph (STIS) and Advanced Camera for Surveys (ACS) on
the \emph{Hubble Space Telescope} (\emph{HST}). We find strong correlations
among the \ion{O}{1} $\lambda$1304 triplet, %\ion{C}{2} $\lambda$1335, the
\ion{Si}{4} $\lambda\lambda$1394/1403 doublet, the \ion{C}{4} $\lambda$1549
doublet, and the \ion{He}{2} $\lambda$1640 line luminosities. For classical T
Tauri stars (CTTSs), we also find strong correlations between these lines and
the accretion luminosity, suggesting that these lines form in processes related
to accretion. These FUV line fluxes and X-ray luminosity correlate loosely with
large scatters. The FUV emission also correlates well with H$\alpha$, H$\beta$,
and \ion{Ca}{2} K line luminosities. These correlations between FUV and optical
diagostics can be used to obtain rough estimates of FUV line fluxes from
optical observations. Molecular hydrogen (H$_{2}$) emission is generally
present in the spectra of actively accreting CTTSs but not the weak-lined T
Tauri stars (WTTSs) that are not accreting. The presence of H$_2$ emission in
the spectrum of HD 98800 N suggests that the disk should be classified as
actively accreting rather than a debris disk. The spectra in the atlas are
available at http://archive.stsci.edu/prepds/ttauriatlas.
