徐济、李越、屈邦选等同志在研究竹蚧过程中,在关中调查和采集了不少寄生蜂。经过初步整理和鉴定,计有5科、18属、20种,其中有5种为我国新记录。实际存在的还远远不止这些。它们在优势种白尾安粉蚧上总的寄生率高达58.9～72.0%,在竹巢粉蚧上也达28.0～51.8%,因而对竹蚧的控制作用十分显著,实在是一批珍贵的物质财富。为便于认识和保护它们,并利于今后深入研究,特将这20种中定出种名的9种和只定出属名而数量很多的2种的形态、寄主、密度等记述如下。一、跳小蜂科 Encyrtidae1.粉蚧长索跳小蜂 Anagyrus pseudoc-occi(Girault)雌蜂体长1.8～2.0毫米,雄的略小。头、胸深黄色,腹黄褐色。触角柄节黑,端部具一白环;梗节基半部黑,端半部白,索节6,第1节黑,第2节灰黄,第3节以后 Xu Ji, Li Yue, Qu Bangxuan and other comrades in the process of studying scale, in Guanzhong survey and collected a lot of parasitic wasps. After preliminary sorting and identification, there are 5 families, 18 genera and 20 species, of which 5 are new records in China. There are actually more than these. Their total parasitism rates of 58.9-72.0% on the dominant species Melastomataxis, and 28.0-51.8% on the Melastomataxis subsp. So that their control on the scale is very significant, which is indeed a precious material wealth . In order to facilitate the understanding and protection of these species and to facilitate further study in the future, nine species of these 20 species with definite names and a large number of species, hosts and densities of only 20 species are given as follows. First, the small bugs Branch Encyrtidae1. Mealybugs long jump bee Anagyrus pseudoc-occi (Girault) female body length of 1.8 to 2.0 mm, male slightly smaller. Head, chest deep yellow, belly brown. Stem black handle, the end of a white ring; stem half black base, the end of the white half, Salk Festival 6, Section 1 black, Section 2 gray, Section 3 after