The Collaborative International Dictionary of English v.0.48:

Flittermouse \Flit"ter*mouse`\, n. [Flitter, v.i. + mouse; cf.
   G. fledermaus, OHG. fledarm[=u]s. Cf. Flickermouse,
   Flindermouse.] (Zool.)
   A bat; -- called also flickermouse, flindermouse, and
   flintymouse.
   [1913 Webster]

The Collaborative International Dictionary of English v.0.48:

Pipistrel \Pi*pis"trel\, Pipistrelle \Pip`i*strelle"\, n. [F.
   pipistrelle, It. pipistrello.] (Zool.)
   A small European bat (Vesperugo pipistrellus); -- called
   also flittermouse.
   [1913 Webster]