The gross morphology of the male internal genitalia of 16 scelionid genera and Malpighian tubules of 17 scelionid genera were studied for the first time. The number of Malpighian tubules is likely to he correlated to the body size, therefore is not informative for further phylogenetic analyses. Analysis of internal male genitalia in scelionids reveals that they are relatively uniform in both Teleasinae (only type IV (Trimorus-type)) and Telenominae (only type V (Trissolcus-type)), but are more diverse in Scelioninae with type I (Sparasion-type), type II (Scelio-type), type III (Apegus-type), and type IV (Trimorus-type) observed.