ACKNOWLEDGMENT
This research was supported by Center of Excellence in Biodiversity, Faculty of Science, Chulalongkorn University (CEB_D_5_2005). In ddition, we would like to thank the Division of Medical Entomology, Ministry of Public Health for giving us live cockroach specimens. We truly thank Mr. Tawit Poopradit and Mr. Komsorn Lauprasert for their assistance in making the modified eight-chamberolfactometers.