. Smithsonian miscellaneous collections. 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 Dytiscus margi- NO. 18 SENSE ORGANS OF COLEOPTERA—McINDOO 55 nalis. The earlier papers concerning the chemoreceptors of Coleoptcraare reviewed by Deegener (see Schroder (y2, pp. 150-151). SinceMinnichs papers on the taste organs of butterflies and flies haverecently been reviewed by the writer (47, pp. 36-39), they will not bediscussed here. The reader should kno
. Smithsonian miscellaneous collections. 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 Dytiscus margi- NO. 18 SENSE ORGANS OF COLEOPTERA—McINDOO 55 nalis. The earlier papers concerning the chemoreceptors of Coleoptcraare reviewed by Deegener (see Schroder (y2, pp. 150-151). SinceMinnichs papers on the taste organs of butterflies and flies haverecently been reviewed by the writer (47, pp. 36-39), they will not bediscussed here. The reader should know, however, that according tothe experiments conducted by Minnich certain butterflies bear so-called taste organs in their tarsi, and certain hairs on the proboscis ofthe blowfly serve as gustatory organs. The most recent paper byMinnich (55) discusses the chemical sensitivity of the legs of ablowfly. The writer (46) described and illustrated many tiny peglike hairsfound on the cotton boll weevil, but did not attribute a gustatory THr. Fig. 17.—Internal anatomy through tip of maxillary palpus of adult Mexicanbean beetle, showing following : Hyp, thick hypodermis; PH. pseudohairs ; plate; Po, gland pore connected with gland cell, which lies some distancefrom pore; SC. sense cells; St, tactile hairs; and THr, so-called taste hairs. A,drawing, two-thirds diagrammatic, X300; and B, semidiagrammatic, X 500. fimction to any of them. According to jxjsition, and possibly to struc-ture, the ones on the tips of the labial and maxillary palpi are bestsuited to be taste organs. The same type of hairs was also found atthe same place on both adult and larva of the Mexican bean beetle(figs. 14-17, THr). The ones at the tip of the maxillary palpus ofthe adult (fig. 14, B) are the most numerous and most conspicuousof any yet observed by the writer, and consequently they would appearto have some function other than that of touch. These tiny, thin-walled, and transparent hairs arise f
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