H. whiteheadi is endemic to the Philippines, where it is widespread excluding the Palawan Faunal Region and the Batanes/Babuyan group of islands. It has been recorded from Biliran, Camiguin, Cebu, Leyte, Luzon (Camarines Sur; there are no records from northern Luzon (L. Heaney pers. comm. 2006)), Maripipi, Masbate, Mindanao (Agusan del Norte, Bukidnon, Davao Oriental, Lanao del Norte, Lanao del Sur, Misamis Occidental, Misamis Oriental, Southern Cotabato, Suriago del Sur and Zamboanga del Norte provinces), Mindoro, Negros, and Samar. Its elevation range is from sea level to 1,800 m.