RESUMO
The authors carried out isoenzyme characterization and genotype comparison studies for Phlebotomus chinensis and Phlebotomus sichuanensis images collected from their holotype/paratype original localities: West Mountain, West Suburb, Beijing and Lixian County, Sichuan Province. Numerical analysis was carried out and the dendrogram of four species of Adlerius was drawn up according to morphological characteristics of these four species. The results showed that P. chinensis and P. sichuanensis can be identified enzymatically in PGM and the MDH-2 allele also differs in P. chinensis from Beijing and. P. sichuanensis. The dendrogram of four Adlerius species showed that P. fengi and P. longiductus are very similar and they clustered first, then P. sichuanensis combine with them to form a combined group. P. chinensis is a separate group from other three. These two groups come to combine at last. Above results have proved that P. sichuanensis is an isolate species instead of a so-called large type P. chinensis.