Proceratium silaceum

Distribution
This taxon was described from U.S.A.

Nomenclature

 *  silaceum. Proceratium silaceum Roger, 1863a: 172 (w.) U.S.A. Emery, 1895c: 265 (q.); Kennedy & Talbot, 1939: 202 (m.); Crozier, 1970: 116 (k.). Senior synonym of rugulosum, vestitum: Creighton, 1950a: 40. See also: Brown, 1958g: 330; Brown, 1974a: 82; Baroni Urbani & De Andrade, 2003b: 408.
 * vestitum. Proceratium crassicorne var. vestitum Emery, 1895c: 266 (w.) U.S.A. Junior synonym of silaceum: Creighton, 1950a: 40.
 * rugulosum. Proceratium silaceum subsp. rugulosum Wheeler, W.M. 1915b: 390 (w.q.) U.S.A. Junior synonym of silaceum: Creighton, 1950a: 40.