“…Mexico is one of the American countries with more (34) species of triatomines; among them, all the six species of the Meccus phyllosomus complex [M. pallidipennis Stål, M. longipennis Usinger, M. picturatus Usinger, M. mazzottii Usinger, M. phyllosomus (Burmeister), and M. bassolsae Alejandre-Aguilar, Nogueda-Torres, Cortés-Jiménez, Jurberg, Galvão and Carcavallo], play an important role in the transmission of Trypanosoma cruzi to human populations, because they can be found in both domestic and wild ecotopes, with frequent domiciliated colonies, and they frequently have high entomological indexes, used to monitored the Chagas control programs (Ramsey et al 2000, Vidal-Acosta et al 2000, Villegas-García & Santillán-Alarcón 2001, Enger et al 2004, Sosa-Jurado et al 2004, SalazarSchettino et al 2005. Habits, feeding, and defecation behaviors of M. pallidipennis and M. longipennis have been extensively studied (Torres-Estrada et al 1993, MenaSegura et al 1994, Bautista et al 1999, Martínez-Ibarra & Katthain-Duchateau 1999, Martínez-Ibarra et al 2003a, Enger et al 2004, Martínez-Ibarra & Novelo-López 2004, Sosa-Jurado et al 2004, Salazar-Schettino et al 2005.…”