Palaeorhiza (Trachyrhiza) Hirashima 1980

Hirashima 1980. A synopsis of the bee genus Palaeorhiza Perkins (Hymenoptera, Colletidae) of New Guinea. Part 3. Subgenera Trachyrhiza, Paraheterorhiza, Hadrorhiza. Journal of the Faculty of Agriculture Kyushu University, 25(2-3) 1980: 99-117