キンウワバ属(ヤガ科)に関する研究 : 幼虫の外部形態と識別法 I

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In this paper, the writer intends to publish the result of his study on the external features of the larvae of several species belonging to the genus Plusia. The mature larvae of the species so far as studied may be distinguished by the following characters : 1. A_3 (the 3rd abdominal segment) and A_4 (the 4th abdominal segment) without the prolegs, and in certain species they are represented by minute hemispherical projections. 2. Crochets on the prolegs heteroideous and biordinal, arranging in mesoseries, but those of the 1st instar homoideous and uniordinal. 3. Body setae rather long with sharp apex. Pimples bearing the setae usually rather weak rarely strong. 4. Seta SD1 on A_8 vertically above the spiracle. 5. Spiracles on A_1 to A_7 elliptical and moderately large. Spiracle on A_7 much more than one-half of that on A_8 in length. In the 1st instar, however, spiracles round, and spiracle on A_7 one-half of that on A_8 in length. 6. Skin points varing from the extremely fine to the moderately large. Differences of the characters among the species may be distinguished by the shape of the maxillary palpus, epipharyngeal setae on labrum, skin points and by the position of setae D1 on T_2 (the 2nd thoracic segment), the number and position of the setal group SV and seta V1 on A_1 to A_4. The coloration is generally green with yellowish white or white lines forming dorsal, subdorsal, and spiracular lines, and in some cases, also a supra-spiracular line, On the head, thoracic and abdominal legs, base of setae and the others, there are often black marks or spots which do not appear to be constant within a species. The coloration often varies from light colour to dark one in some species. In the dark coloured larva its skin points are black, and such individuals may be able to obtain by artificially crowded rearing. The eggs are usually deposited one by one, though P. festata is an exception writer has observed, on the under surfaces of the leaves of the host plants, so that the larvae live solitarily since the 1st instar. When larvae reach to maturity, they bend leaves and spin white thin cocoons on the under surface of them, in which they pupate. The writer names the three pairs of epipharyngeal setae as EP1 (the 1st epipharyngeal seta), EP2 (the 2nd epipharyngeal seta), and EP3 (the 3rd epipharyngeal seta), numbering them from the inner pair to outer pairs.
1958-04-30

キンウワバ属(ヤガ科)に関する研究 : 幼虫の外部形態と識別法 I

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