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| 第一著者: | |
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| フォーマット: | Recurso digital |
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Zenodo
1946
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| 主題: | |
| オンライン･アクセス: | https://doi.org/10.5281/zenodo.5217377 |
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目次:
- <p><b>93. Microvelia diluta Distant,</b></p>Ann. Mag. Nat. Hist. VIII,<b>3:</b>500, 1909; Lundblad, Arch. Hydrobiol., Suppl.<b>12</b>: 307, 1933; Esaki, Tenthredo<b>1:</b>351, 1937.<p>Fifty-seven apterous specimens, Upi Trail, May 5, Usinger; eight apterous specimens, Mt. Chachao, May 16, Usinger; one specimen, apterous, head waters of Talofofo River, June 17, Usinger.</p><p>The extraordinary sexual dimorphism was noted by Lundblad who also remarked 011.the occurrence of the small males in copulation with the females in his series of preserved specimens. Esaki (Tenthredo <b>1</b>:352, 1937) apparently overlooked this characteristic of <i>diluta</i> in his discussion of <i>Microvelia notophora</i> from the Carolines, for he stresses the "unique" habit of males habitually riding on the backs of the larger females and does not compare his new species with <i>diluta.</i> He reports the capture of a macropterous female of <i>diluta</i> at light on Saipan. Most of the Guam specimens were collected together, the small male clasped to the back of the female by means of his legs. None of these pairs was actually in copulation. <i>M. notophora</i> differs from <i>diluta</i> in that only the fore tibiae possess an apical comb and this comb is nearly one third the length of the tibia. <i>Notophora</i> differs further, according to Esaki's description, in the very short pronotum which is only about one third as long as the mesonotum. The size of apterous males and females of <i>notophora</i> is about as in <i>diluta</i> but the Guam males differ from this, being slightly larger, 1.4-1.5 mm. <i>M. diluta</i> Distant is known elsewhere from India, Ceylon, Sumatra, and Saipan.</p>