Procryptocerus is a Neotropical genus of gliding ants, with the ability to "parachute" by steering their fall if they drop off of the tree they're on. Distribution Procryptocerus inhabits rainforests from the Isthmus of Tehuantepec in Mexico to northern Argentina. Due to their cryptic habits, living inside twigs, these ants are rarely collected. At present, most species are known from Central America, Colombia and Brazil. Taxonomy The genus was created by Emery (1887) to include species of Neotropical ants that were considered similar to those of the Paleotropical genus Cataulacus. Procryptocerus has been the object of two revisionary studies. Kempf (1951) revised the entire genus and Longino and Snelling (2002) the Central American species. Kempf (1951) recognized 28 species, and 8 subspecies, while for Central America Longino and Snelling (2002) recognized 14 species, described four new species, synonymized two species, and elevated two subspecies to species level. Currently, 45 species are included in the genus. Description The genus is characterized by the protrusion of the clypeus forming a broad nasus and antennal scrobes over the eyes. The toruli are located right posterior to the flanks of the nasus opposite to each other. The vertex is deflexed posteriorly in most species. Procryptocerus ants possess notoriously variable morphology. Different characters, such as propodeal spine length, form of the clypeus, type of sculpture, and other such characters vary remarkably, sometimes even within the same species. Knowledge of morphology and anatomy is incomplete for all species. Adult workers are mostly black in color, body variously sculptured and monomorphic, ranging from 3.5–8.5 mm. Although similar to workers, gyne are larger (3.7–9.5 mm) with thoracic sclerites corresponding to alates in other apocritans. Males are longer and more slender than gynes, ranging from 4.8 mm to 9.9 mm in length. Species Procryptocerus adlerzi (Mayr, 1887) Procryptocerus attenuatus (Smith, 1876) Procryptocerus balzani Emery, 1894 Procryptocerus batesi Forel, 1899 Procryptocerus belti Forel, 1899 Procryptocerus carbonarius (Mayr, 1870) Procryptocerus clathratus Emery, 1896 Procryptocerus convergens (Mayr, 1887) Procryptocerus convexus Forel, 1904 Procryptocerus coriarius (Mayr, 1870) Procryptocerus curvistriatus Kempf, 1949 Procryptocerus eladio Longino & Snelling, 2002 Procryptocerus elegans Santschi, 1921 Procryptocerus ferreri Forel, 1912 Procryptocerus gibbosus Kempf, 1949 Procryptocerus goeldii Forel, 1899 Procryptocerus gracilis (Smith, 1858) Procryptocerus hirsutus Emery, 1896 Procryptocerus hylaeus Kempf, 1951 Procryptocerus impressus Forel, 1899 Procryptocerus kempfi Longino & Snelling, 2002 Procryptocerus lenkoi Kempf, 1969 Procryptocerus lepidus Forel, 1908 Procryptocerus marginatus Borgmeier, 1948 Procryptocerus mayri Forel, 1899 Procryptocerus montanus