Wikipedia
Phausis is a genus of firefly beetles (family Lampyridae). These beetles are for the most part unimpressive in their appearance and behaviour, so have not drawn much study, and little is known about many of the species. Species in this genus are at least known from Europe and North America. More than seven species occur in North America, ranging throughout much of the continent.
The genera Phausis and Lamprohiza are very similar and in need of revision; the delimitations between the two are not clear. Alternatively, Phausis may be paraphyletic and/or at least in part synonymous with Lamprohiza. The genus is traditionally placed in the tribe Photinini of the Lampyrinae, but at least the blue ghost firefly, Phausis reticulata does not seem to be particularly close to this group (or Lamprohiza for that matter) and might not even belong in the subfamily Lampyrinae.