Citations: Anonym 1877: [Billings, E.] American journal of science and arts (= Hauptsachtitel von: Amer. journal science, 3. Ser.,New Haven), New Haven/Conn. 14, S. 78-80
Whiteaves, J. F. 1877: [Billings, E.] Geol. Mag. 4, pp. 43-45
Whiteaves, J. F. 1878: [Billings, E.] The Canadian Entomologist, London 8, B15 10219, pp. 251-261