Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . discover their food with unerring certainty, even when concealedfrom sight. Among the nocturnal species, where sight can playbut a small part at best, the sense of smell seems most highlydeveloped, and usually more in the male than in the is due to the lact that the males, as a rule, seek their mates, 44 ECONOMIC ENTOMOLOGY. and so keen is this sense that they discover the presence of thefemale, even when confined in a breeding-cage, if a window be leftopen. S
Economic entomology for the farmer and fruit-grower : and for use as a text-book in agricultural schools and colleges . discover their food with unerring certainty, even when concealedfrom sight. Among the nocturnal species, where sight can playbut a small part at best, the sense of smell seems most highlydeveloped, and usually more in the male than in the is due to the lact that the males, as a rule, seek their mates, 44 ECONOMIC ENTOMOLOGY. and so keen is this sense that they discover the presence of thefemale, even when confined in a breeding-cage, if a window be leftopen. Sometimes male wood-borers will sit around a spot on thebark for a considerable time awaiting the emergence of a female,which their keen sense tells them is fully developed and ready tomake her way out. Carrion feeders discover their food when con-cealed from sight, and almost before decay has set in. So far aswe have been able to ascertain, the olfactory organs are situatedin the antennae, and form small pits or depressions, from whichusually arise specialized hairs, bristles, or pegs, as the case may be. Fig. Sensory organs of insects.—^, sensory pittings in plant-louse antennae ; B, organ ofsmell in May-beetle; C, same in wasp; Z>, sensory organs in Termes flavipes; E, F,organs of taste in a wasp ; G, organ of smell in grasshopper; H, sensory depressionson the tibia of Teiines; /, terminal joint of antenna of an ant; K, section through theantenna of a honey-bee, showing supposed olfactory organs. All greatly enlarged. The sense of touch is located popularly, and I think correctly, inthe antennae ; but it is quite certain that tactile hairs exist all overthe body of the insect, more developed in some than in others,and most, perhaps, in larval forms. These structures alwaysconsist of specialized hairs or bristles, and end in a nerv£ cell. STRiCTURE AND CLASSIFICATION. 45 It is probable that in the antennae we have a sense of percep-tion which is able to discriminate
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1906
