Figures 6–11 in Observations on Antennal Morphology in Diptera, with Particular Reference to the Articular Surfaces between Segments 2 and 3 in the Cyclorrhapha

Figures 6–11. Details of antennal seg. 2 in nematocerous dipterans. (6) Ptychoptera capensis Alexander (fam. Ptychopteridae), right segs. 1 and 2, distal view. (7) The same, sensory structures; scale = 3 µm. (8) Chironomus (s.l.) sp. (fam. Chironomidae), left side of head after removal of flagellum. (9) The same, part of distal articular surface showing pedicellar button; scale = 2 µm. (10) Macrocera sp. (fam. Keroplatidae), part of distal articular surface (left antenna) showing button and possible campaniform sensillum. (11) Sciara sp. (fam. Sciaridae), part of distal articular surface (left antenna) showing button. bu, pedicellar button; cm, campaniform sensillum (?).