The tribe Micrutalini and its two genera, Trachytalis Fowler and Micrutalis Fowler, are redescribed. The following species are treated and, in some cases, nomenclatura! changes introduced: Trachytalis isabellina Fowler, 1895; T. distinguenda Fowler, 1895; T. retrofasciata (Lethierry, 1890), comb.n.; Micrutalis alrovena Goding, 1930; M. balteata (Fairmaire, 1846) = Aculalis lucidus Buckton, 1902, syn.n.; M. bella Goding, 1929; M. biguttula (Fairmaire, 1846), comb.n.; M. binaria (Fairmaire, 1846) = Acutalis flavivenlris Lethierry, 1890, syn.n.; M. callan-gensis Goding, 1930; M. calva (Say, 1830); M. discalis (Walker, 1858); M. dorsalis (Fitch, 1851); M. dubia Fowler, 1895 = M. zeteki Goding, 1928, syn.n.; M. flava Goding, 1929; M. flavozonala (Fairmaire, 1846), comb.n. = Acutalis geniculata Stál, 1862, syn.n. = Acutalis modesta Stál, 1862, syn.n.; M. godfreyi Sakakibara, 1976; M. incerla Sakakibara, 1976; M. lata Goding, 1930; M. litlerala (Fairmaire, 1846), comb.n.;M lugubrina(Stál, 1862);M malleiferaFovj]er, 1895 = M binariamutabilis Fowler, 1895, syn.n.; M. minutus Buckton, 1902; M. nigrolineata (Stál, 1864); M. nigromarginata Funkhouser, 1940; M. notalipennis Fowler, 1895; M. occidentalis (Goding, 1893); M. pollens Fowler, 1895; M. parva (Goding, 1893); M. plagíala (Stál, l&62) = AcutalisvariabiIisBerg, 1879,syn.n. =M. chapadensisGoding, 1930,syn.n.; M. punctifera (Walker, 1858); M. semialba (Stál, 1862); M. stipulipennis Buckton, 1902; M. tau Goding, 1930; M. trifurcala Goding, 1893; M. tripunctata (Fairmaire, 1846) = Acutalis moesta Stál, 1859, syn.n. = M. tartaredoides Goding, 1930, syn.n.. New species: Micrutalis diminuta sp.n. (Ecuador, Pichincha); Micrutalis divisa sp.n. (Brazil, Mato Grosso); Micrutalis henki sp.n. (Panama, Canal Zone); Micrutalis infúscala sp.n. (Venezuela, Portuguesa); Micrutalis margínala sp.n. (Brazil, Mato Grosso); Micrutalis meridana sp.n. (Venezuela, Mérida); Micrutalis mucuya sp.n. (Venezuela, Mérida); Micrutalis robustula sp.n. (Venezuela, Caracas); M. seminigra sp.n. (Brazil, Paraná); Micrutalis turriba sp.n. (Costa Rica, Turrialba). Lectotypes are designated for: Acutalis balteata Fairmaire, 1846, Aculalis binaria Fairmaire, 1846, Acutalis flavozonala Fairmaire, 1846, una Acutalis tripunctata Fairmaire, 1846. New taxonomic position: Micrutalis melanogramma (Petty, 1833) is transferred to Melu-sinella Metcalf, 1952 (Ceresini) - Melusinella melanogramma (Petty, 1833), comb.n. = Melusinella nervosa (Fairmaire, 1846), syn.n.. Species incertae sedis: Tragopa ephippium Burmeister, 1836.
Homoptera; Membracidae; Smiliinae; Micrutalini; taxonomy; lectotypes