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Polillo Island is the largest among the Polillo group of islands. It is the third (ca 700sq km) largest island of the Luzon biogeographic region. The island lies in central eastern Luzon, at the western edge of Pacific Ocean and has a seasonal climate with distinct dry and wet season. The island is biologically rich with several insular species or subspecies (McGregor, 1910; Robinson, 1911; Manuel, 1957). The recent Odonata survey revealed the rich Odonata fauna of the island (Villanueva, 2010). This paper provides an update on the known Odonata based on recent fieldwork in 2010.
Polillo is a small group of island (27 islands in total) east of central Luzon (Figure 1). It is made up of four main island viz. Polillo I, Patnanungan I, Jomalig I and Palasan I and several islets. This island group has relatively flat to gentle sloping terrain and the highest point is only 300 m asl (Mt. Maluhod) in Polillo Island (ca 700 kmĀ²) which is the largest in the group and the third largest island in greater Luzon biogeographic region.