Acrotrichis Motschulsky, 1848

Darby, Michael, 2014, Studies of Madagascan Ptiliidae (Coleoptera) 3: The genus Acrotrichis including twenty seven new species, Zootaxa 3866 (2), pp. 151-201 : 155

Acrotrichis Motschulsky, 1848

Unless stated otherwise all species share the following features: body elongate, usually rather broad, relatively flat, dorsal surface including the head pubescent. Antennae with 11 segments 1–2 forming the scape and pedicel being much larger than 3–11, and 9–10 forming a loosely formed and tapering club; all segments bearing long setae. Sides of pronotum with a narrow raised margin, and hind angles produced backwards. Scutellum without distinguishing features. Metascutellum with a single lateral spine or spur on each side (not present in any other Ptiliidae subfamily (Hall, 2000)). Elytra truncate apically exposing +/- 4 abdominal segments. Proventrum narrow in front of the procoxae. Mesoventrum with a well developed collar extending across the pleura and a raised keel between the mesocoxae. Metasternum pubescent, posterior margin between the metacoxae with sharp lateral points. Metacoxae with large rounded plates tapering to the lateral margins. Abdominal tergites 2–5 with wing folding spicule patches. Pygidium composed of tergites 9 and 10 fused seamlessly together with or without 2/3 teeth. Abdominal ventrite one without femoral lines. Male ventrite six with a more or less curved excision, ventrite seven small, covering the excision in ventrite six, and with an anteriorly directed apodeme, aedeagus symmetrical in dorsal/ventral view, usually with two hooks (described by Sundt (1969) as parameres). Spermatheca well developed. Wings of usual featherwing type.