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N. E. McINDOO 



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 {!)', flagellum, consisting of second to twelfth 

 segments {2 to IB), bearing Johnston's organ {J), pit pegs {PP), pore plates 

 (P) and Forel flasks (Fl) ; 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 (K) of articular membrane (ArtM) in sockets (S) 

 of chitin (Ch), and soft, flexible strands of chitin {Ch) which firmly bind second 

 and third segments together; X 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 {Nuc) and sense fiber (SF) and 

 probably the latter's nucleus (Nuc); 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 (iJr), nerve 

 strand [St), cavity (Ca), and aperture {Ap). 



