Affiliations: * Department of Parasitology, Faculty of Medical Technology, Mahidol University, Bangkok, Thailand
** Department of Medical Entomology, Faculty of Medical Tropical Medicine, Mahidol University, Bangkok, Thailand
*** National Institute of Health, Department of Medical Sciences, Ministry of Public Health, 88/7 Tiwanon Road, Nonthaburi 11000, Thailand
This study aimed to investigate the species distribution of indoor cockroaches in dwellings in Bangkok. Commercial sticky traps were used to catch cockroaches in 128 private residences (40 single houses, 49 townhouses, 39 apartments), 34 offices, and 30 small groceries. The cockroaches were identified as Periplaneta americana, Supella longipalpa, Blattella germanica, Neostylopyga rhombifolia, P. brunnea, P. australasiae, Pycnoscelus surinamensis, and B. lituricallis; two were unidentified species. The most common species were P. americana, S. longipalpa and B. germanica -- most of which were nymphal stages. P. americana and S. longipalpa infested all kinds of buildings, especially private residences (50.0% and 17.2%, respectively) and offices (61.8% and 58.8%, respectively); they were also found mostly (15.1%) in mixed infestation and with no predominant species. B. germanica (26.7%) were significantly predominant in groceries. Air conditioners have no influence on cockroach distribution.