Acarologische aanteekeningen. LVI. [Acarologische BemerkungenLVI.]Published in Ber Ned Ent Ver, in 1915, in volume 4, pages 180-188Acarologische aanteekeningen. LVII. [Acarologische BemerkungenLVII.]Published in Ber Ned Ent Ver, in 1915, in volume 4, pages 192-200
Acarologische aanteekeningen. LVII. [Acarologische BemerkungenLVII.]Published in Ber Ned Ent Ver, in 1915, in volume 4, pages 192-200