Note 216 — Chapter V · EMBALLONURINE ALLIANCE. FAMILY V.—EMBALLONURIDÆ, OR THICK-LEGGED BATS.

In one species, Saccopteryx plicata, from Costa Rica, of which Professor Peters makes his genus Balantiopteryx, the sac is placed in the middle of the shoulder membrane. In this species, also, the facial part of the skull is inflated on each side. In S. canina and its allies the sac is in the margin of the membrane. These form the genus Peropteryx of Professor Peters.