Front cover: Photos show the life history of Panorpa macrostyla Hua (Mecoptera: Panorpidae): adult (A), egg (B), larva (C) and pupa (D). As one of the most primitive groups of holometabolous insects, scorpionflies have compound eyes in larval stage, with significance in studying the evolutionary origin of holometabolous insects. In this issue, the ultramorphological features of the immature stages of P. macrostyla with notes on its biology are reported (pp. 1004-1012). Photos of adult (A) and egg (B) were taken by JIANG Lu at Huaboshan, Kuandian, Liaoning and Northwest A&F University, respectively, and photos of larva (C) and pupa (D) by WANG Ji-Shen at Northwest A&F University.