Chrysotus mediotinctus (Capellari & Amorim, 2014)

Capellari, Renato Soares & Amorim, Dalton De Souza, 2014, New combinations and synonymies for Neotropical species of Diaphorinae (Diptera: Dolichopodidae), Beiträge Zur Entomologie = Contributions to Entomology 64 (2), pp. 375-381 : 376-377

The mediotinctus -group

Diagnosis (based on males). Large-sized species of Chrysotus (5 mm or longer). Face and frons with parallel sides. Antennae yellow to orange, postpedicel sometimes brownish; antennal stylus apical. Thorax mostly shinning green, eventually with yellow areas (e.g., metepimere); acrostichals absent; six pairs of dorsocentrals; upper part of proepisternum, in front of anterior spiracle, bare. Wing: membrane hyaline or smoked, sometimes with a conspicuous transversal brown stripe; veins R 4+5 and M 1 subparallel and slightly moved posteriad; distal section of vein CuA shorter than crossvein dm-cu (see BECKER 1922: fig. 63; PARENT 1929: fig. 30, 1931: fig. 24, 1934: pl. 68, fig. 14; CAPELLARI & AMORIM 2010: fig. 19). Legs: mostly yellow, middle coxa (sometimes also hind coxa) and apices of tarsi brown; pulvilli small; tarsal claws present. Abdomen: usually greenish, with coppery reflections dorsally and lateral yellow spots, sometimes from tergite 1 to 6; tergite 6 with setae and bristles restricted to posterior margin ( Fig. 1-3). Hypopygium: partially hidden under tergite 6, surstyli as a single lobe, with short spine at apex (see CAPELLARI & AMORIM 2010: figs 5 and 6).

Remarks: This group includes the following three species, dealt with below, as well as C. maculatus (PARENT) (= Diaphorus maculipennis ROBINSON ; holotype in the Natural History Museum of London, examined) and C. singularis PARENT (holotype in the SNSD, examined). Some of the diagnostic characters listed above should be regarded as apomorphies (see Discussion), in such a way that gathering these five species in a group seems justified on a reasonable hypothesis of monophyly. The group is currently known only from South America: Surinam, Peru, Bolívia, and Brazil (Pará, Amapá, Maranhão, Mato Grosso, Minas Gerais, São Paulo).