Picus canus hessei Gyldenstolpe, Orn. Monatsber., vol. 24, No. 2, February 1916, p. 28.= Picus canus hessei Gyldenstolpe, 1916
Syntype : Female ad., Dene Chai, Northern Siam. 15. II. 1912. N. Gyldenstolpe leg. No. 158. - Measurements of type : wing : 147 mm.; tail : 122,5 mm.; culmen : 37 mm.; tarsus : 25 mm.Click on the picture for enlargement.