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We introduce the Baryon Oscillation Spectroscopic Survey (BOSS) Emission-LineLens Survey (BELLS) for GALaxy-Ly$\alpha$ EmitteR sYstems (BELLS GALLERY)Survey, which is a Hubble Space Telescope program to image a sample ofgalaxy-scale strong gravitational lens candidate systems with high-redshiftLy$\alpha$ emitters (LAEs) as the background sources. The goal of the BELLSGALLERY Survey is to illuminate dark substructures in galaxy-scale halos byexploiting the small-scale clumpiness of rest-frame far-UV emission in lensedLAEs, and to thereby constrain the slope and normalization of thesubstructure-mass function. In this paper, we describe in detail thespectroscopic strong-lens selection technique, which is based on methodsadopted in the previous Sloan Lens ACS (SLACS) Survey, BELLS, and SLACS for theMasses Survey. We present the BELLS GALLERY sample of the 21 highest-qualitygalaxy--LAE candidates selected from $\approx 1.4 \times 10^6$ galaxy spectrain the BOSS of the Sloan Digital Sky Survey III. These systems consist ofmassive galaxies at redshifts of approximately 0.5 strongly lensing LAEs atredshifts from 2--3. The compact nature of LAEs makes them an ideal probe ofdark substructures, with a substructure-mass sensitivity that is unprecedentedin other optical strong-lens samples. The magnification effect from lensingwill also reveal the structure of LAEs below 100 pc scales, providing adetailed look at the sites of the most concentrated unobscured star formationin the universe. The source code used for candidate selection is available fordownload as a part of this release.

The BOSS Emission-Line Lens Survey. III. : Strong Lensing of Ly$\alpha$ Emitters by Individual Galaxies