Factorial map containing the principal components of the head where each species is represented by circles. Brown – Rhodnius dalessandroi; gray – Rhodnius domesticus; red – Rhodnius marabaensis; orange – Rhodnius milesi; yellow – Rhodnius montenegrensis; light green – Rhodnius nasutus; light blue – Rhodnius neglectus; dark green – Rhodnius neivai; lilac – Rhodnius prolixus; light pink – Rhodnius robustus (Suppl. material 2).