North american two-winged flies of a genus cylindromyia meigen (ocyptera of authors) no 2624 from the proceedings of the united states national museum, vol 68,2 art 23, pp 1-27, with pl 1.
North american two-winged flies of the genus cylindromyia meigen (ocyptera of authors). no. 2624 - from the proceedings of the united states national museum, vol. 68, art. 23, pp. 1-27, with pl. 1.