Alloretochus sp. (Fig. 3D) Diagnosis. Adult medium sized (male body ca. 3.5 mm); with gray shading on terga I–II and VI–VIII; ratio pedicel/scape, 2.0; with posteromedian projection on metanotum and vestiges of posterolateral projections on abdominal segments IV–VI; male subgenital plate subtriangullar and broadly truncated apically, hind margin very slightly concave; ratios forceps length/subbasal width 11.2. Material. One male imago (slide IBN622CM, genitalia damaged while mounting) from COLOMBIA, Dpto Amazonas, P.N. Amacayacu, Qda. Mata-Mata, S 3º 48' 28" — W 70º 15' 21", 2–5.II.1999, at light 4–6 h AM, E. Domínguez, M.C. Zúñiga & C. Molineri cols. Discussion. The single male imago may represent a different, unknown species of Alloretochus. However, it is not formally proposed here because of the bad condition of the material. This male imago is temporarily placed in Alloretochus because of the emarginated (although very slightly) hind margin of the styliger (Fig. 3D). Nevertheless, as the adult stage of Latineosus is yet not known, it is also possible that this individual belongs to L. colombianus, the only brachycercine previously known from Colombia. The main difference with other species is the much slender forceps (ratio L/ W 11.2). This male was collected at the same light trap with a much smaller male here attributed to A. peruanicus (treated above).

Published as part of Molineri, C., 2014, Description of Alloretochus sigillatus new species with comments and new distributional records for Alloretochus peruanicus (Ephemeroptera, Caenidae, Brachycercinae), pp. 139-145 in Zootaxa 3821 (1) on page 144, DOI: 10.11646/zootaxa.3821.1.11, http://zenodo.org/record/226219