Figures 26–28 in Observations on Antennal Morphology in Diptera, with Particular Reference to the Articular Surfaces between Segments 2 and 3 in the Cyclorrhapha

Figures 26–28. Antennal structure in some basal cyclorrhaphans. (26) Opetia nigra Meigen, male (fam. Opetiidae), left antennal seg. 2 after removal of seg. 3, distal view. (27) The same, left seg. 3 and arista, lateral view. (28) Microsania arthuri Chandler (fam. Platypezidae), left seg. 3 and arista, medial view. pp, postpedicellar pouches.