Gastroserica impressicollisGastroserica impressicollis is a species of beetle of the family Scarabaeidae. It is found in China.DescriptionAdults reach a length of about 6.6–7.5 mm. They have an elongate-oval body. The colour is variable, ranging from dark chestnut brown to yellowish-brown with two large dark stains on the pronotum. The legs are often lighter. The dorsal surface is iridescent and has fine, short hairs and a few single, longer setae.