182 N. E. McINDOO 
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Figs. 3 to 11 Antennal sense organs of honey-bee. Fig. 3, dorsal surface of 
right antenna of worker, showing following: Two groups of olfactory pores 
(Por) on condyle (Co) and scape (1); flagellum, consisting of second to twelfth 
segments (2 to 12), bearing Johnston’s organ (J), pit pegs (PP), pore plates 
(P) and Forel flasks (F/); the tactile hairs and pegs are not represented; X 20. 
Fig. 4, superficial appearance of Johnston’s organ on worker antenna, showing 
knobs (K); X 320. Figs 5 and 6, oblique sections through Johnston’s organ in 
drone antenna, showing knobs (A) of articular membrane (Art) in sockets (S) 
of chitin (Ch), and soft, flexible strands of chitin (Ch) which firmly bind second 
and third segments together; * 500. Fig. 7, from three consecutive longitudinal 
sections of nineteen-day-old worker antenna, showing sensory part of Johnston’s 
organ, consisting of sense cell (SC), its nucleus (Nwe) and sense fiber (SF) and 
probably the latter’s nucleus (Nwc); note distal end of sense fiber attached to 
knob (K) of articular membrane (ArtM); X 1000. Figs. 8 to 11, internal struc- 
ture of antennal organs; X 1000. Fig. 8, olfactory pore from worker condyle. 
Fig. 9, pore plate from drone antenna, showing plate (P), two grooves (d and e), 
and double hinge-like membrane (m). Figs. 10 and 11, pit peg and Forel flask, 
respectively, from worker antenna, showing semitransparent hair (Hr), nerve 
strand (St), cavity (Ca), and aperture (Ap). 
