[[p. 182]] I think I may be allowed to express my surprise at Mr. McLachlan's statement that this subject has never yet been [[p. 183]] "even more than casually alluded to in works on geographical distribution," and is "ignored in the principal ones;" when I have devoted no less than six pages of my book on "The Geographical Distribution of Animals" (vol. ii. pp. 42-48) to a discussion of the main facts--quite as much as could be properly given to it in a general work. It is, however, well worthy of a detailed study, which I am very glad is being undertaken by so competent an entomologist. I hope Mr. McLachlan will endeavour to obtain collections of coleoptera and other orders of insects from the higher tropical Andes, where, I feel confident, some northern forms will also be found.

Alfred R. Wallace

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