Triatominae species are considered the main vectors of Chagas disease or American Trypanosomiasis.In Venezuela,the principal vectors are Rhodnius prolixus (St(a)l,1959) and Triatoma maculata (Erichson,1848),which are belonged to the tribe Rhodniini and Triatomini,respectively.The head conformation and size development of these species can reflect ontogenetic changes which contribute with the vectors biology studies,as well to support of instars determination.The goal of the paper is to the application of geometric morphometric techniques for describing head conformation and size of instars of these species.We photographed 140 heads in R.prolixus:First instar (Ⅰ:16),second instar (Ⅱ:17),third instar (Ⅲ:18),fourth instar (Ⅳ:21),fifth instar (Ⅴ:21),adult female (F:26) and adult males (M:21);in T.maculata heads of 136 specimens were photographed,Ⅰ:20,Ⅱ:17,Ⅲ:26,Ⅳ:15,Ⅴ:19,F:20 and M:19.Landmark coordinate (x,y) configurations were registered and aligned by Generalized Procrustes Analysis.Covariance Anal

来源：动物分类学报 2017 年 42卷 1期