The brown planthopper (BPH), Nilaparvata lugens (Stal.) is animportant pest of rice. The objective of this study was to examine thedifference in the biology of two different morphs of BPH viz., brownmorph and black morph. The BPH populations were collected fromrice fields of two different locations of Tunga-Bhadra Project (TBP)areas of Karnataka. The biology of these two morphs of BPH wasstudied during 2017-18 on rice cultivar BPT-5204 under laboratoryconditions at the Department of Agricultural Entomology, AgriculturalResearch Station, Gangavathi, Raichur district. The oviposition occursinside the leaf sheath near the base of the plant. Fecundity rate variedfrom 140-170 and 150-180 eggs for brown and black morphs,respectively with a range of 3-12 eggs per egg mass. Pre-oviposition,oviposition, post-oviposition, incubation, total nymphal period, maleand female longevity varied 2.11 ± 0.41, 14.2 ± 1.03, 6.3 ± 0.64, 8.03± 0.69, 16.85 ± 2.79, 18.2 ± 2.25 and 22.65 ± 0.48 days, respectivelyfor brown morphs. Similarly, for black morphs the values varied 2.17± 0.49, 14.8 ± 0.67, 6.15 ± 0.81, 8.20 ± 0.54, 16.65 ± 2.25, 18.50 ±2.88 and 23.12 ± 0.16 days, respectively. No significant variationswere observed in the biology studies of both the morphs