168 THOUGHTS ON SPECIES. 



liarities of structure, and the ornamentation of the normal 

 form, with the chief variations to which it is liable. 



The determination of true species from the imago is by no 

 means easy or simple; but when individuals agree in all 

 these particulars, when their biographies and structure impress 

 the mind with the idea of identity, there can be no longer 

 any doubt that they are representatives of one and the same 

 conception, even though the perfect forms may differ mate- 

 rially in ornamentation. 



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