中文摘要：

为解决无法用文字实现对近千种连续变化的昆虫体色进行准确的描述和合理的数学运算问题,本文采用国际标准颜色计量技术-PFG（Pantone Formula Guide）颜色指南为昆虫体色性状判别标准,提出了关于数值化描述昆虫体色的相关评价指标,如体色元（body-colorelement,BCE）、体色群（body-color group,BCG）、体色位（body-colorposition,BCP）、高频色码指数（high frequency color-code index,HFI）和杂色指数（variegated color index,VCI）等及其定量分析方法。并应用这些指标和方法,研究了甘薯天蛾Agrius convolvuli幼虫个体在相似环境条件下体色分化的多样性以及不同发育日龄和不同虫体部位（体位）其体色的演化过程及其数值规律,发现甘薯天蛾幼虫存在着共同的主体色,而且其体色的变异主要发生在个体的不同发育日龄（占总变异的72.66%）,其次,虫体不同部位的颜色也有明显的差异（占总变异的24.45%）,而同一发育日龄个体间的体色差异仅占总变异的2.88%。结果说明,甘薯天蛾幼虫体色随其发育日龄所发生的变化过程,可能是由遗传因子所决定的一种生命体从发育到衰老的表观呈现过程。

英文摘要：

To study the quantitative impact laws of environmental or genetic factors on the insect body color,we must first solve the measurement problem of characteristics of the standardized values of the insect body color.If different researchers who determine the color do not use the uniform standards,no matter what method is used,such as genetic,molecular,physiological or ecological methods,etc.,to study it,the results would be potentially misleading.In order to solve the problem that nearly a thousand kinds of insect body colors with continuous changes can not be described accurately and computed reasonably by the text and mathematics,this study adopted the color measurement technology of international standard-PFG（Pantone Formula Guide） color guide as the criterion of insect body color trait,and proposed some evaluation indicators on numerical description of insect body color,such as body-color element（BCE）,body-color group（BCG）,body-color position（BCP）,high-frequency color-code index（HFI）,variegated color index（VCI）,etc.,and some quantitative analytical methods.Using these indicators and methods,we studied the differentiation diversity,change process and numerical law of the body color on different body positions of different larval individuals of sweet potato hawk moth Agrius convolvuli（Linnaeus） at different developmental ages under similar environmental conditions.It was found that A.convolvuli larvae had a common main body color.The body color variation occurred mainly at different developmental ages in the individuals,accounting for 72.66% of the total variation.The difference of body color on different parts of an individual was also significant,accounting for 24.45% of the total variation,while the color difference among individuals at the same developmental age was very small,accounting for only 2.88% of the total variation.The results indicate that the process of color change occurred with the developmental stage of A.convolvuli larvae may be a process of appearance performance o