Genus Ariasa Distant, 1905d new record

Ariasa Distant 1905d: 314.

TYPE SPECIES.— Tympanoterpes colombiae Distant 1892a: 60 (Colombia).

REMARKS.— Ariasa can be distinguished from Fidicina and Fidicinoides by the presence of three-part tarsi. Majeorona Distant, 1905d has a head width wider than the mesonotum, with the prominent eyes stylate and extended anteriorly. The genus Proarna possesses a head that is about as wide as the mesonotum with the eyes barely or not extending beyond the anterior angle of the pronotum, radial crossvein vertically oriented to the radius anterior 2 and radius posterior veins with a radiomedial crossvein that is obliquely oriented, large semicircular male opercula, and triangular or small, curved timbal covers. Guyalna can be distinguished by the head being as wide or slightly wider than the mesonotum, eyes that only protrude slightly beyond the anterior angles of the pronotum, parallel sides of the abdomen, and the median uncus lobes are bent forming a horse-shoe shape when viewed from the posterior. Dorisiana can be distinguished by its head being as wide or wider than the mesonotum with the eyes not extending beyond the lateral edges of the pronotum, triangular timbal covers, ventral margin of the timbal cover angled dorsally not parallel to the long body axis, and the median uncus lobes are bent.

Ariasa is most similar to Cracenpsaltria Sanborn, 2016c also represented in the Ecuadorian fauna. Species of Ariasa can be distinguished by the posteriorly extending median uncus lobe rather than the separate, long hooked lateral uncal lobes found in Cracenpsaltria, the pygofer distal shoulder is angled in Cracenpsaltria, the laterally expanding abdominal segments are absent in Cracenpsaltria, and the length of the abdomen is greater than the distance between the apex of the head and the posterior cruciform elevation in Cracenpsaltria.

DISTRIBUTION.—Species of the genus have been recorded previously from Argentina, Bolivia, Brazil, Colombia, French Guiana, Guyana, Paraguay, Peru, Suriname, Uruguay, and Venezuela (Metcalf 1963a; Sanborn 2011a, b; 2013; 2016b; 2016c; 2019b; 2020a, b; Sanborn & Heath 2014). The range is expanded here to include Ecuador.