. Smithsonian miscellaneous collections. n liy present writer and illustrates thevarious parts of one of the standard traj^s. At this place a few more remarks concerning the attractivenessof geraniol should be made. The effort is usually made to correlateattractive odors either with the food or opposite sex of an animal;but in some cases it is questionable whether food, or sex, or someimknown factor, is involved. For example, why should the banana-like odor of amyl acetate attract grasshoppers, or certain beetles?And why does the odor from the catnip plant attract members ofthe cat family
. Smithsonian miscellaneous collections. n liy present writer and illustrates thevarious parts of one of the standard traj^s. At this place a few more remarks concerning the attractivenessof geraniol should be made. The effort is usually made to correlateattractive odors either with the food or opposite sex of an animal;but in some cases it is questionable whether food, or sex, or someimknown factor, is involved. For example, why should the banana-like odor of amyl acetate attract grasshoppers, or certain beetles?And why does the odor from the catnip plant attract members ofthe cat family? In regard to the attractive power of geraniol, a foododor is probably involved, although we know little about it. Smith(7^> P- 59) ^d Smith and Hadley (79, p. 58) in two of their earlierreports remark that several of the essential oils were found to behighly attractive to the Japanese beetle, and that on studying theseoils, it was discovered that one of the higher alcohols, geraniol, was NO. IJ SENSE ORGANS OF COLEOPTERA McINDOO 23. 5ait Container--Jar Fig. 4.—Japanese beetle trap, used by the Federal Plant Quarantine and Con-trol Administration, showing parts of it in a cut-out perspective view. It is one-fourth natural size and was drawn by the writer by using a 1929 trap and adrawing of a 1930 trap, the latter being furnished by Mr. Courtney. The beetles,attracted by the odor from the l^ait in the bait container, fly directly into thefunnel or strike the baffle and then fall down through the funnel into the fruitjar, where they cannot escape because they can neither fly out nor climb thewalls of the jar. 24 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 82 a constituent of all the oils found to be distinctly attractive. Tests weremade of a series of the preferred food plants, and in all cases theseplants contained geraniol in varying quantities. The present writerhas seen no report by a chemist concerning the last statement; but asregards fruit. Power and Chesnut (6i) fou
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