Mocis undata (Fabricius), commonly called brown-striped semilooper, feeds on many economically important plants and crops such as longkong, citrus, pomelo, soybean, Shorea, Hevea, Gossypium, Nephelium, Solanum etc. Here, we report pupal parasitism by the parasitoid Brachymeria lasus with a detailed biology of Mocis undata from Kerala, India.