During the "Beagle" survey voyage, Charles Darwin noted in his journal for 26 March 1835 having "experienced an attack, &amp; it deserves no less a name, of the "Benchuca", the great black bug of the Pampas. It is most disgusting to feel soft wingless insects, about an inch long, crawling over ones body; before sucking they are quite thin, but afterwards round &amp; bloated with blood, &amp; in this state they are easily squashed." Richard Keynes describes this "Benchuca" as being "Triatoma infestans".