Pestov , V.G. On enlargability of infinite-dimensional Lie superalgebras (56K, AmS TeX 2.1) ABSTRACT. We show that in infinite dimensions a Lie superalgebra coming from a Rogers supergroup may not come from a DeWitt one. Thus, we produce an evidence that a whole class of Lie superalgebras can be enlarged only by means of the ``naive'' approach to supermanifolds, which therefore cannot be merely thrown away.