author(s)
Nirmali Borah and LK Hazarika

abstract
Biology and morphometrics of Periplaneta americana (L.) (Blattodea: Blatellidae) were studied in the Physiology Laboratory, Department of Entomology, Assam Agricultural University, Jorhat. Six instars were observed in the present study. The pre- oviposition period, incubation period, nymphal period, adult longevity and total life cycle period were recorded to be 8.4±1.40, 40.66±4.43, 326.83±76.30, 272.76±57.40 and 367.50± 74.95 days, respectively. In morphometrics study, the body parameters like body length, antennal length, head width, pronotum length and width were measured, and it was observed that the adult exhibited sexual dimorphism, the male being comparatively longer and larger than the female.