Accepted by J. Longino: 6 Aug. 2008; published: 1 Oct. 2008 1 ZOOTAXA ISSN 1175-5326 (print edition) ISSN 1175-5334 (online edition) Copyright © 2008 · Magnolia Press Zootaxa 1890: 1–49 (2008) www.mapress.com/ zootaxa/ A taxonomic revision of the Neotropical myrmicine ant genus Lachnomyrmex Wheeler (Hymenoptera: Formicidae) RODRIGO M. FEITOSA 1 & CARLOS ROBERTO F. BRANDÃO 2 Museu de Zoologia da Universidade de São Paulo, Av. Nazaré 481, 04263–000, Ipiranga, São Paulo, SP, Brazil. E-mail: 1 rfeitosa@usp.br; 2 crfbrand@usp.br Table of contents Abstract .............................................................................................................................................................................. 2 Introduction ........................................................................................................................................................................ 2 Methods .............................................................................................................................................................................. 3 Taxonomic synopsis ........................................................................................................................................................... 4 Taxonomic account ............................................................................................................................................................ 5 Lachnomyrmex Wheeler, 1910 ........................................................................................................................................... 5 Key to the identification of Lachnomyrmex workers ......................................................................................................... 8 Species descriptions ......................................................................................................................................................... 11 Lachnomyrmex amazonicus Feitosa & Brandão, new species .................................................................................. 11 Lachnomyrmex fernandezi Feitosa & Brandão, new species .................................................................................... 13 Lachnomyrmex grandis Fernández & Baena, 1997 .................................................................................................. 15 Lachnomyrmex haskinsi Smith, 1944 ....................................................................................................................... 17 Lachnomyrmex laticeps Feitosa & Brandão, new species ........................................................................................ 19 Lachnomyrmex lattkei Feitosa & Brandão, new species ........................................................................................... 21 Lachnomyrmex longinodus Fernández & Baena, 1997 ............................................................................................ 23 Lachnomyrmex longinoi Feitosa & Brandão, new species ....................................................................................... 25 Lachnomyrmex mackayi Feitosa & Brandão, new species ....................................................................................... 27 Lachnomyrmex nordestinus Feitosa & Brandão, new species .................................................................................. 29 Lachnomyrmex pilosus Weber, 1950 ......................................................................................................................... 31 Lachnomyrmex platynodus Feitosa & Brandão, new species ................................................................................... 34 Lachnomyrmex plaumanni Borgmeier, 1957 ............................................................................................................ 34 Lachnomyrmex regularis Feitosa & Brandão, new species ...................................................................................... 38 Lachnomyrmex scrobiculatus Wheeler, 1910 ........................................................................................................... 40 Lachnomyrmex victori Feitosa & Brandão, new species .......................................................................................... 43 Acknowledgments ............................................................................................................................................................ 48 References ........................................................................................................................................................................ 48