26 



SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 8l 



The antennal organs of five male and five female codling moths 

 were carefully examined by the present writer. Little or no sexual 

 dift"erences were observed in the antennae or their organs. The 

 antennae of both male and female are filiform and bear the same kinds 

 and practically the same number of organs (tables i and 2). The 

 number of segments in the antennae of males ranges from 55 to 61 

 with 58 as an average ; those in the antennae of females from 59 to 

 63 with 62 as an average. Each antenna bears one Johnston organ 



Fig. 3. — Antennal organs of female codling moth, No. 3. A and B, External 

 views, X 125. C to G, Sections ; C to F, X 500 ; G, X 320. A, Second and third 

 antennal segments ; B, two segments from middle of antenna ; C, pit peg ; D, 

 style and end peg; E, sense hair and its innervation; F, non-innervated scalelike 

 hair ; and G, cross section through distal end of segment near middle of antenna. 



Abbreviations: /, Johnston organ; A'', nerve; P, olfactory pore; S, style; 

 Sc, sense cell; Sea, sense bristles (Sensilla chaetica) ; Sco, pit peg- (S. coelo- 

 conica) ; SJi. non-innervated scalelike hair; ^'.y, end pegs (S. styloconica) ; St, 

 sense hairs (S. trichodea) ; Tc, trichogenous cell; and Tr, trachea. 



(fig. 3, A, /), 2 or 3 olfactory pores (P), numerous pit pegs (fig. 3, 

 B, Sco), end pegs {Ss) on styles (S), sense bristles {Sea), sense 

 hairs {St), and scalelike hairs {Sh). Each of these, except the last 

 named, is supposed to be a sense organ, and Freiling (23) has even 

 pictured a slender scalelike hair of another moth as connected with a 

 sense cell. Of these seven structures only the olfactory pores, pit pegs, 

 and end pegs are supposed to be olfactory in function. 



Pit pegs may be found on all segments, except the first, second, 

 and the last one or two, of codling-moth antennae. If odors can pass 



