Of the 17 genera in Triatominae, only one, Linshcosteus, occurs exclusively
outside the New World (India). Its relationship to the rest of the subfami
ly has been questioned, a question made urgent by the fact that many triato
mines are vectors of the protozoan which causes Chagas' disease. Using a si
mple measure of similarity, we show that Linshcosteus is less similar to th
e other triatomine genera than each of them is to the others.