Revision of the genus Macrostomus Wiedemann (Diptera: Empididae: Empidinae): II. The pictipennis species-group

all species of macrostomus wiedemann allied with macrostomus pictipennis (bezzi), are treated in the pictipennis species-group. three currently recognized species and four new species are included, namely m. cervicicauda smith, m. cysticercus smith, m. manauara, sp. nov. from brazil (amazonas and pará states), m. pacaraima, sp. nov. from brazil (roraima, amazonas and pará states), m. pictipennis (bezzi), m. smithi, sp. nov. from guyana and brazil (roraima state) and m. utinga, sp. nov. from brazil (pará state). all primary types were examined and a key to species is presented.