Figures 14–18 in Observations on Antennal Morphology in Diptera, with Particular Reference to the Articular Surfaces between Segments 2 and 3 in the Cyclorrhapha

Figures 14–18. Details of antennal seg. 2 in nematocerous dipterans. (14) Plecia dimidiata Macquart (fam. Bibionidae), part of distal articular surface (left antenna), showing button. (15) Nemapalpus capensis Edwards (fam. Psychodidae), seg. 2, distal view (left antenna). (16) The same, detail of part of distal articular surface, showing button. (17) Dixella sp. (fam. Dixidae), seg. 2, distal view (left antenna). (18) The same, detail of button (right antenna). bu, pedicellar button.