Review of the Gauromydas giant flies (Insecta, Diptera, Mydidae), with descriptions of two new species from Central and South America Author Calhau, Julia Author Lamas, Carlos José Einicker Author Nihei, Silvio Shigueo text Zootaxa 2015 4048 3 392 411 journal article 10.11646/zootaxa.4048.3.3 b4821e2a-e7c4-4d33-8391-0c1edee73107 1175-5326 245783 BDDE455C-B9FE-4037-AA21-FB130C07FE63 Gauromydas Wilcox, Papavero & Pimentel Gauromydas Wilcox, Papavero & Pimentel, 1989 : 104 . Type-species: Mydas heros Perty, 1833 (orig. des.). Diagnosis . Antenna at least as long as head width, or up to 2 times longer. Distal portion of postpedicel 5 to 6 times longer than wide (measures not taken for G. autuorii and G. m a t eu s sp. nov. ). Hind femur 1.5 to 2.5 times wider than hind tibia. Hind tibia with well-developed ventral keel and apical spur, the latter always larger than width of hind tarsomere 1 (except in female G. mystaceus ). Hind tarsomere 1 2–3.4 times longer than wide, about as long as T3–4 together, slightly shorter than tarsomere 5 or up to 2.2 times longer. Phallus with a distinct dorsal crest (phallic crest). Distribution . Argentina , Brazil , Costa Rica , Guyana , French Guyana , Paraguay , Peru , Trinidad and Tobago , Surinam .