Belongs within: Eptesicus.
Histiotus is a genus of bats found in South America, marked by the possession of particularly large ears.
Characters (from Miller 1907): Dental formula and structure of teeth as in Eptesicus, but outer upper incisor considerably reduced, its tip scarcely extending beyond cingulum of inner. Skull as in Eptesicus, but more elongated and with larger audital bullae, their diameter more than double width of space between them. Ears very large, at least as long as head, united by ridge or low band of membrane across forehead.
<==Histiotus Gervais 1856C57 |--*H. velatus (Geoffroy 1824)C57, FS15, C57 (see below for synonymy) |--H. alienus Thomas 1916FS15, C57 |--H. humboldtiFS15 |--+--H. laephotis Thomas 1916FS15, C57 [=H. macrotus laephotisC57] | `--H. macrotus (Poeppig 1935)FS15, C57 (see below for synonymy) `--+--H. magellanicus (Philippi 1866)FS15, C57 (see below for synonymy) `--H. montanus (Philippi & Lansbeck 1861)FS15, C57 [=Vespertilio montanusC57, Vesperugo montanusC57, Vesperus montanusC57] |--H. m. montanus [incl. Vesperus segethii Peters 1864]C57 |--H. m. colombiae Thomas 1916C57 `--H. m. inambarus Anthomy 1920C57
Histiotus macrotus (Poeppig 1935)FS15, C57 [=Nycticeius macrotusC57, Nycticejus macrotisC57, Vespertilio macrotusC57, Vesperugo macrotusC57; incl. Nycticeus chilensis Leason 1836C57, Nycticeius chilensisC57, Plecotus poeppigii Fitzinger 1872C57]
Histiotus magellanicus (Philippi 1866)FS15, C57 [=Vespertilio magellanicusC57, H. montanus magellanicusC57, Vesperugo magellanicusC57, Vesperus magellanicusC57; incl. Vespertilio capucinus Philippi 1866C57]
*Histiotus velatus (Geoffroy 1824)C57, FS15, C57 [=Plecotus velatusC57, Vespertilio velatusC57, Vesperugo velatusC57; incl. Histiotus velatus miotis Thomas 1916C57]
*Type species of generic name indicated
References
[C57] Cabrera, A. 1957. Catalogo de los mamiferos de America del Sur. I (Metatheria—Unguiculata—Carnivora). Revista del Museo Argentino de Ciencias Naturales “Bernardino Rivadavia” e Instituto Nacional de Investigacion de Las Ciencias Naturales, Ciencias Zoológicas 4 (1): 1–307.
[FS15] Faurby, S., & J.-C. Svenning. 2015. A species-level phylogeny of all extant and late Quaternary extinct mammals using a novel heuristic-hierarchical Bayesian approach. Molecular Phylogenetics and Evolution 84: 14–26.