. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FUNCTION OF LARVAL ANTENNA OF LEPIDOPTERA 411 severe surgical shock than the removal of either pair alone. (1) Re- generation of antennae or maxillae in subsequent instars was accom- panied by return of the olfactory sense. (2) Operations involving in- jury to more and larger nerves, as removal of all thoracic legs or de- capitation, did not result in shock of sufficient severity to impair the ol- factory sense. Mortality rates were less than 1 per cent. It may be seen from Table I that these operations were not sufficiently
. The Biological bulletin. Biology; Zoology; Biology; Marine Biology. FUNCTION OF LARVAL ANTENNA OF LEPIDOPTERA 411 severe surgical shock than the removal of either pair alone. (1) Re- generation of antennae or maxillae in subsequent instars was accom- panied by return of the olfactory sense. (2) Operations involving in- jury to more and larger nerves, as removal of all thoracic legs or de- capitation, did not result in shock of sufficient severity to impair the ol- factory sense. Mortality rates were less than 1 per cent. It may be seen from Table I that these operations were not sufficiently shocking to interfere with the normal life processes of the insect. Two facts were noted in the course of these experiments which sug- gested that a determination of the threshold for response to olfactory LJ tr or UJ CD -40 -30 -20 -I 0 385 425 465 505 545 585 625 665. GRAMS OF BENZALDEHYDE PER LITER OF GAS (x 10~7) FIG. 3. Change in the threshold sensitivity of larvae of P. rapac L. to the odor of benzaldehyde following amputation of the antennae. The open histogram represents the threshold of response of normal larvae; the cross-hatched histogram, that of larvae lacking antennae. stimuli might shed further light on the nature and locus of the olfactory sense. (1) Larvae lacking maxillae apparently responded more rapidly than larvae lacking antennae. (2) Occasional specimens lacking both antennae and maxillae gave questionable, feeble responses when strong odorous liquids, as turpentine or ammonia, were held not more than one millimeter away from the head for a period of sixty seconds or longer. Accordingly the threshold values for response to benzaldehyde were determined for normal larvae of Pieris rapae as described above. It was found that the average threshold for response was 580 X 10~7 ± X 10~7 grams of benzaldehyde per liter of gas mixture. For larvae from which the antennae had been removed the threshold was. Please note that these images are extracted from sc
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Keywords: ., bookauthorlilliefrankrat, booksubjectbiology, booksubjectzoology
