. Smithsonian miscellaneous collections. d olfactory pore (P). J, semidiagrammaticdrawing from> 3 cross sections through base of first antennal segment, showingtactile hairs (St), gland pore (Po), olfactory pore (P), trachea (Tr), andnerve (N). fact that this number is small for an adult insect might be correlatedwith the fact that the bean beetle is stupid when the olfactory re-sponses are considered. The olfactory pores on several individuals of all four instars ofbean-beetle larvae were examined. Since no differences in numberand position were observed, the pores were carefully studied o
. Smithsonian miscellaneous collections. d olfactory pore (P). J, semidiagrammaticdrawing from> 3 cross sections through base of first antennal segment, showingtactile hairs (St), gland pore (Po), olfactory pore (P), trachea (Tr), andnerve (N). fact that this number is small for an adult insect might be correlatedwith the fact that the bean beetle is stupid when the olfactory re-sponses are considered. The olfactory pores on several individuals of all four instars ofbean-beetle larvae were examined. Since no differences in numberand position were observed, the pores were carefully studied on onlyindividuals of the fourth instar. They are illustrated in figure total number of pores on all appendages and the head are asfollows: Legs 30, maxillae 12, head capsule 6, antennae 4, labrtmi 4, 54 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 labium 4, and mandibles 2, making 62 pores in all. The fact that thisnumber is extremely low for any insect may help to explain why theselarvae did not respond readily to odor Fig. 16.—Position of olfactory pores (dots), 12 to 15 so-called taste hairs(Thr) at tip of each palpus, 8 tactile or so-called olfactory hairs(St) at tip of each antenna, and ocelli (Oc) on larva of bean beetle, X and B, inner and outer sides respectively of right front leg. The number ofpores on the legs is nearly constant, and they shift only slightly in and D, dorsal and ventral surfaces respectively of the head and head appen-dages. On the base of each antenna one pore is on the dorsal side and one onthe ventral side. On each terminal maxillary segment there is a slit-shaped pore. 2. SO-CALLED TASTE ORGANS Several writers, particularly Nagel (58), have described certaintiny peglike hairs on the mouth parts of insects as taste organs, butno one has ever demonstrated that they perform such a (25) found many Tast- und Geschmackszapfchen on the maxillary and labial palpi of the water beetle Dyti
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