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On the Origin of Species

By: Charles Darwin

...as species or varieties. Now Fries has re- marked in regard to plants, and Westwood in regard 59 Charles Darwin to insects, that in large genera the ... ...r generally common to very large groups of beetles, but in the Engidae, as Westwood has remarked, the number varies greatly; and the number likewise d... ...ngst insects, in one great division of the Hymenoptera, the anten- nae, as Westwood has remarked, are most constant in structure; in another division ... ..., denudation of Web of feet in water-birds West Indian islands, mammals of Westwood on species in large genera being closely allied to others; on the ...

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