The genus Tropicohilaragen. nov. (Diptera: Empididae: Empidinae: Hilarini) is described and includes the following six new species from Brazil: Tropicohilara amazonensissp. nov. (type species, Brazil: Amazonas, Manaus); T. bahiensissp. nov. (Brazil: Bahia, Camacan); T. bellasp. nov. (Brazil: Pernambuco, Jaqueira); T. mineirasp. nov. (Brazil: Minas Gerais, Itamonte); T. paranaensissp. nov. (Brazil: Paraná, Piraquara); and T. sinclairisp. nov. (Brazil: Paraná, Morretes). The genus is presently recorded from the Amazonian and Atlantic Forest biomes. It differs from other hilarine genera by the following combination of characteristics: predominantly yellowish specimens; occiput somewhat conical in dorsal view; postpedicel elongate, male first fore tarsomere unmodified; hind tibia slightly shorter than hind femur; wing vein R2+3 with setae on ventral surface; male tergite 7 with a sclerotized band at posterior margin, tergite 8 reduced and upwardly directed so that terminalia can be flexed forward. A key to the species is provided.