“…In areas of arboreal caatinga, this technique has been applied only recently (Silva 2011a;Macêdo 2012). Our Winkler extracted samples in Milagres allowed us to add 23 new records of species for the biome (highlighted in Table I with an asterisk), which means an increase of almost 14% in the number of previously recognized species for the Caatingas, including a recently described species of Oxyepoecus (Myrmicinae, Solenopsidini), O. regularis Ulysséa & Brandão, 2012. It is important to note that updated global and regional catalogues of ant species were published in the last decade (Bolton 2003;Bolton et al 2006;Palácio & Fernández 2003), new mechanisms were made available for online identification (Longino 2005;Sarnat 2008), and tribes as well as widely distributed genera and subfamilies were partially or totally revised: Amblyoponinae (Yoshimura & Fisher 2012 (Lattke et al 2007); Linepithema (Wild 2007); Megalomyrmex (Brandão 1990(Brandão , 2003; Mycetophylax, Paramycetophylax and Kalathomyrmex (Klingenberg & Brandão 2009), Oxyepoecus (Albuquerque & Brandão 2004; Pheidole of the Americas (Wilson 2003); Prenolepis (LaPolla et al 2010), Trachymyrmex species groups (Mayhé- Nunes & Brandão 2002, 2005, 2007 and Wasmannia (Longino & Fernández 2007). These revisions, associated with the direct comparison with specimens deposited in the collection of Hymenoptera in the MZSP, allowed the identification at species-level of most of the analyzed material.…”