Phyllotreata striolata (Fabricius) is a major pest on the cruciferous vegetables. Adults feed on leaves of the host plant while larvae crawl into the soil and feed on roots. Location of tubercles and body chaetotaxy on larvae are significant to diagnosis. They are described based on the phylogenetic consideration and illustrated with line drawings. Pupa and setae on head, mouthparts, and leg of larvae are also illustrated and described for identification.