Ducteoles of the secretory cells in the spermatheca of Psila Rosae Fabricius (Diptera, Psilidae) /
Pontecorvo, G.
Royal Entomological Society of London.
[London : Royal Entomological Society of London,
1944]
Offprint from: Proceedings of the Royal Entomological Society, London, (A) 19., pts. 1-3 (Mar. 1944).
Caption title.
Psila Rosae.