Re-description of 1st instar larva of Osmylus fulvicephalus (Scopoli, 1763) (Neuroptera, Osmylidae) based on naming system of sclerites

In this study, the first instar larva of <i>O.fulvicephalus</i> was re-described in detail and illustrated, based on the naming system of sclerites. Based on this, it could be effectively distinguished from other species by the following characteristics: i) number of segments in the labial palpi; ii) the setae beard on the apex of antenna; iii) the number of transversal rows of the anal hooks. In addition, we compared the sclerites and other morphological characteristics with the third instar larvae of <i>Osmylusfulvicephalus</i> to better distinguish larvae at different developmental stages.