Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomolo00smit Year: 1906 42 J A' â ENTOMOL Oo ^. arated ; or there may be only two. one on each side, near the base of tlie antenna, as is usual in butterflies and moths. I'U;. 22. Sensory organs of insects.â.-), one elemetU in eye ol a roach ; />', section of compound eye ; C, organs of smell in May-beetles ; /?, sense organs in abdominal appendages ; Ji, sensory ear ; J^, ear on foreleg of locust; <V, ear found on the basal segment of grass-
Economic entomology for the farmer and the fruit grower, and for use as a text-book in agricultural schools and colleges; economicentomolo00smit Year: 1906 42 J A' â ENTOMOL Oo ^. arated ; or there may be only two. one on each side, near the base of tlie antenna, as is usual in butterflies and moths. I'U;. 22. Sensory organs of insects.â.-), one elemetU in eye ol a roach ; />', section of compound eye ; C, organs of smell in May-beetles ; /?, sense organs in abdominal appendages ; Ji, sensory ear ; J^, ear on foreleg of locust; <V, ear found on the basal segment of grass- hopper abdomen. All greatly enlargeil. Compound eyes are so termed because they are made up of a great number of simple eyes, or ocelli, set very close together. If the head of a bee or house-fly is examined, it will be noted that the brown eyes occupy a very large portion of its surface, and if one of those eyes be viewed under the microscope it will be found to be faceted, or to of thousands of little hexagonal , resembling in appearance the top of a honey- comb. Each one of these facets represents a complete eye, capable of forming an image upon its own little retina, and the combination of all the little retinal pictures is what a fly or other insect sees. In some cases the eyes are .so enormous that the insect can see everything going on in front, at each side, above and beneath, and even back, except directly behind it. It is ditificult for us, who are able to see in one direction only, to
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