Sclerite 1 of the distal median plate. Different aspects of the sclerite: form, degree of development of process from posterior portion articulated with A1 and A2 veins, degree of development and form of apical lobed process, shape of basal margin of process from posterior portion articulated with A1 and A2 veins, and form of the basilateral margin of the process from posterior portion articulated with A1 and A2 veins. Six characters were obtained based on the study of sclerite 1 of the distal median plate (characters 21–26). A Belostoma denticolle Montandon var1 B B. minor (Pasilot de Beauvois) C B. estevezae Ribeiro and Alecrim D B. oxyurum (Dufour) E B. sanctulum Montandon F B. micantulum (Stål) var1 and var2 G B. parvum Estévez and Polhemus H B. plebejum (Stål).