AbstractTuthilliagen.n. (Homoptera: Psylloidea) is erected for four Neotropical species:canabinasp.n. (the type‐species from Belize and Panama),cognatasp.n. (Brazil),latipennissp.n. (Panama) andiunctasp.n. (Brazil). It is suggested thatTuthilliaforms a monophyletic group with the ciriacremine generaCiriacremum, KleiniellaandPal‐mapenna.However, onlyiunctapossesses an R‐M cross vein in the forewing, a character which has been used to define the ciriacremines in the past. It seems, therefore, that this character is unstable and alternative synapomorphies are discussed. The genital morphology ofTuthilliais similar to that found in both Ciriacreminae and Diaphorininae (Aphalaridae). It is speculated that these subfamilies represent previously unrecognized sister groups defined using the genital characters as synapomor