From G. R. Waterhouse   [c. June 1845]

My dear Darwin

I have been hesitating for some time whether I should bother you with another note, but as I cannot be easy without doing so—here goes— When I wrote to you last I was at the Museum where I had not my notes about the Galapagos Insects & the moment I got home I found I had made an omission—that of not noticing two species of Water beetles— The one is the Tropisternus lateralis of [authors] an insect which is found in the United States, in Mexico & the some of the West Indian Islands— The other, also a Water-beetle, is a minute species of Hydrophilus which agrees very closely with a North American species— these little Hydrophili however are so extremely difficult to determine that I will not pretend to give a decided opinion upon them— The Tropisternus is a large & very distinct species of which there can be no doubt—¹

I have added considerably to that foot note,² and have been obliged to make a foot note of it, and much other matter, for my paper comes to 30 or 40 closely written pages & besides I wished as much as possible to keep such extraneous matter out of the body of the paper where it would only bother people who would consult it for the matter which it professes to contain— It is I hope improved & when printed of course I will forward a copy to you—and, if you do not disapprove of the additional parts I shall be much pleased—

I have in working out these insects taken the opportunity to describe several other of the more interesting insects contained in your collection—from Patagonia &c—³ The descriptions are quite prepared for press, but I am afraid of frightening Taylor & mean to let him print what he has first—

I am particularly pleased that you do not disapprove of the notions conveyed in my last

Believe me | Sincerely yours | Geo R Waterhouse