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Recent work suggests that strong emission line, star-forming galaxies may besignificant Lyman Continuum leakers. We combine archival HST broadbandultraviolet and optical imaging (F275W and F606W, respectively) with emissionline catalogs derived from WFC3 IR G141 grism spectroscopy to search forescaping Lyman Continuum (LyC) emission from homogeneously selected$z\simeq$2.5 SFGs. We detect no escaping Lyman Continuum from SFGs selected on[OII] nebular emission (N=208) and, within a narrow redshift range, on[OIII]/[OII]. We measure 1$\sigma$ upper limits to the LyC escape fractionrelative to the non-ionizing UV continuum from [OII] emitters, $f_{esc}<$5.6%,and strong [OIII]/[OII]$>$5 ELGs, $f_{esc}<$14.0%. Our observations are notdeep enough to detect $f_{esc}\lesssim$10% typical of the low redshift Lymancontinuum emitters. However, we find that this population represents a smallfraction of the star-forming galaxy population at $z\simeq$2. Thus, unless thenumber of extreme emission line galaxies grows substantially to z$>$6, suchgalaxies may be insufficient for reionization. Deeper survey data in therest-frame ionizing UV will be necessary to determine whether strong lineratios could be useful for pre-selecting LyC leakers at high redshift.

The Lyman Continuum escape fraction of emission line-selected $z\sim2.5$ galaxies is less than 15%