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Various optical phenomena can be induced in periodic arrays of nanoparticlesby the radiative coupling of the local dipoles in each particle. Probably themost impressive example is bound states in the continuum (BICs), which areelectromagnetic modes with a dispersion inside the light cone but infinitelifetime, i.e., modes that cannot leak to the continuum. Symmetry-protectedBICs appear at highly symmetric points in the dispersion of periodic systems.Although the addition of nonequivalent lattice points in a unit cell is an easyand straightforward way of tuning the symmetry, BICs in such particle lattice,i.e., non-Bravais lattice, are less explored among periodic systems. Startingfrom a periodic square lattice of Si nanodisks, we have prepared threenon-Bravais lattices by detuning size and position of the second disk in theunit cell. Diffraction-induced coupling excites magnetic/electric dipoles ineach nanodisk, producing two surface lattice resonances at the $\Gamma$ pointwith a band gap in between. %of $\sim$ 41 meV.  The high/low energy branch becomes a BIC for the size/position-detuned array,respectively, while both branches are bright (or leaky) when both size andposition are detuned simultaneously. The role of magnetic and electricresonances in dielectric nanoparticles and the change of BIC to brightcharacter of the modes is explained by the two different origins of BICs in thedetuned arrays, which is further discussed with the aid of a coupled electricand magnetic dipole model. This study gives a simple way of tuning BICs attelecom wavelengths in non-Bravais lattices, including both plasmonic anddielectric systems, thus scalable to a wide range of frequencies.

Engineering bound states in the continuum at telecom wavelengths with non-Bravais lattices