The nymphs of three species of Hemiptera: Heteroptera: Dipsocoromorpha, Ceratocombus (Ceratocombus) coleoptratus (Zetterstedt), Ceratocombus (Xylonannus) brevipennis Poppius (Ceratocombidae) and Pachycoleus pusillimus (J. Sahlberg) (Dipsocoridae) are described and illustrated. Keys to species and to nymphal instars are provided. Ontogeny of several morphological features, life cycle, habitats and food habits are discussed. The pattern of dorsal abdominal scent glands in C. brevipennis nymphs, their persistence in adults of both Ceratocombus species and the occurrence of fifth dorsal abdominal scent gland in the 5th nymphal instar of P. pusillimus are reported for the first time.

异翅亚目：三个物种半翅目的若虫Dipsocoromorpha，Ceratocombus（Ceratocombus）coleoptratus（Zetterstedt），Ceratocombus（Xylonannus）brevipennis Poppius（Ceratocombidae）和Pachycoleus pusillimus（J. SAHLBERG）（Dipsocoridae）中描述和示出。提供了物种和若虫龄期的关键。讨论了几种形态特征，生命周期，栖息地和饮食习惯的个体发育。背腹臭腺中的模式Ç。brevipennis若虫，它们在两种绒毛虫的成虫中持续存在品种和第五背腹部臭腺中的5龄若虫发生P。脓疱首次报道。