The holotype and some paratypes were deposited in the collection of Museo de La Plata, La Plata, Argentina (MLPA). Biogeographical regions are in accordance with Morrone (2001, 2004). General terminology for Diptera follows that of McAlpine (1981), while specific morphological terminology for Psychodidae follows Quate and Brown (2004) and Moya et al. Drawings were made with the aid of a Canon Powershot® A590 camera, and digitally processed with Inkscape 0.48.4. Specimens were observed using a Leica MZ6 magnifying lens and a Leitz wetzlar Dialux ocular microscope with micrometer.
Specimens were macerated with hot 10% sodium hydroxide, dehydrated, cleared with clove oil, and mounted on a slide in Canada balsam. According to Morrone (2004, 2006) this area is located in the Subandean Patagonia province, Andean region, Patagonian Subregion. This National Park is one of the biggest in Argentina, with an extension of approximately 709.886 hectares, and extends between the provinces of Río Negro and Neuquén. Specimens were captured with Malaise traps located on the west side of the Nahuel Huapi National Park (NHNP). In this paper I describe a new species of Desmioza, based on male and female characteristics, from Nahuel Huapi National Park, Río Negro province, Argentina. The 2 species described before and the one described here have been recorded for the southern part of South America, more specifically from Patagonian Argentina. Desmioza is distinguished by the following characteristics: head with same coloration above and below eyes, eyes separated, interocular suture present, eye bridge with 3 facet rows, antennae shorter than wing width, flagellomeres fusiform or barrel shaped, simple unbranched ascoids, wing with infuscate patterns, costa without second costal node, R 5 ending beyond the wing tip, a spur at the base of R 3, anterior gonocoxal apodemes expanded, plate like, paramere absent, and aedeagus asymmetrical ( Quate & Brown, 2004). edwardsi (Tonnoir), and transferred to Desmioza another species described by Tonnoir (1929): Pericoma speciosa they also described for the first time the male of the latter species. Then, Quate and Brown (2004) re-established Desmioza as a valid genus, included D.
Subsequently Quate (1963) treated Desmioza as a synonym of Pericoma Walker and mentioned that some of the unique characters of Desmioza species were “of no more than specific rank”. The genus Desmioza was proposed by Enderlein (1937) to include a previously described species by Tonnoir (1929): Pericoma edwardsi from Bariloche, Argentina.
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