Lilioceris egena, commonly known as black-bellied long-necked goldenrod, is a species of beetle, belonging to the family Chrysomelidae, subfamily Criocerinae.

Lilioceris egena is native to Southeast Asia, and has been found in China (Anhui, Fujian, Hainan, Hong Kong, Sichuan, and Yunnan Provinces), India (Assam, Karnataka, and Uttarhand), Laos (Vientianne Province), Nepal, Vietnam (Tây Nihn and Ho Chi Minh Provinces), and Singapore.

[3] Lilioceris egena has a reddish-brown or yellowish-brown body colour, a black or dark brown ventral surface.

It is being released in Florida as a biological control for air potato (Dioscorea bulbifera) vines.

Females lay eggs on the air potatoes' tubers and the larvae feed on them.