若干蛾类翅面正投影形状聚类分析鳞翅目：缰翅亚目)

本文以翅面正投影形状的特征参数为指标，对20科71种鳞翅目蛾类昆虫进行系统聚类。结果，粘虫Mythimna separata、小地老虎Agrotis ypsilon、稻纵卷叶螟Cnaphalocrocismedinalis等迁飞昆虫集中地归于一类，表明具有远距离迁飞行为的蛾类翅面几何形状相似，存在区别于其它种类的共同特征，即前翅较窄长，翅前缘较平直，外侧宽阔。这可能是适应远距离迁飞的特征。

CLUSTER ANALYSIS FOR PROJECTION PARAMETERS OF THE WINGS IN 71 SELECTED MOTHS (LEPIDOPTERA: HETERONEURA)

The geometrical projections of the wings of 71 species of selected mothswhich belong to 20 families in Heteroneura were made, and an orthogonal coordinatewas established for each projection based on the longest diameter of projection and thevertical bisector of the diameter' Then three parameters (R1, R2, and R3) were calculatedaccording to the wing areas in each quadrant (S1, X2 S3 and S4) as follows:R1=(S3+S4) /(S1+S2), R2=(S3+S4) /S2, R3=S4/S2.The hierarchical clusterings were conducted for 18 species of Pyralididae, 15species of Noctindae, and all 71 tested species separately, based on the Euclidean distances or similarity coefficients of the three parameters (R1, R2 and R3) of wing projection among species. The results showed that the migratory moths, Mythimna separata,Agrotis ypsilon and Cnaphalocrocis medinalis, always clustered in one group in clustering for either the fore wing or the combination of fore and hind wings' It issuggested that the shapes of the wings in migratory moths have some commongeometrical characters different from other tested lepidopterans. These common characters seem to be: (1) The anterior margin of the fore wing is rather straight, and thecostal area is narrower, and (2) The outer area of the fore wing is wider. These twocharacters are suitable to long-distance migratory flight of the migratory moths by aircurrent.