I am but imperfectly acquainted with this genus, knowing it only through the Nat. Hist. Tin,, vol. xi. ; andl the plan of that work does not seem to admit of details of structure. If it is equivalent to Aechmia, Perittia, Tinagma and Douglassia combined, as those genera are limited in Ins. Brit., v. 3, then the proper place for this species is in it. But if, as I conclude from the account in Nat. Hist. Tin.. it is the equivalent of Tinagma alone, and the other groups above mentioned are good, distinct genera, then this species, while possessing affinities with all, would be out of place in either.