First issued in release COL21.6.
Last used in release COL23.9
Published in
Walker, F. 1861. Characters of undescribed Diptera in the collection of W. W. Saunders, Esq., F.R.S. &c. [part]. Transactions of the Entomological Society of London (N.S.) 5: 297-334. [1861.02.25]