williamsi Marino & Spinelli, 1999a: 5 (male, female). Type locality: Argentina, Buenos Aires,
Berisso, Los Talas, 34°52'16.47''S, 57°51'8.76''W. HT F (MLPA). Distr.: Argentina (Buenos Aires: type locality; isla Martín García, 34°11'16.95"S, 58°14'41.93"W; Ensenada, Reserva Natural Integral Punta Lara, marginal forest, 34º47'21.2''S, 57º59'56.8''W). Refs.: Marino & Spinelli, 1999a: 5; Cazorla et al., 2018: 5.
Diagnosis. Species recognized by the following combination of characters: flagellomeres of female antenna elongated, vasiform; third palpal segment moderately swollen at midportion without sensory pit, fourth and fifth segments completely fused; scutum yellowish; two pyriform spermathecae with short and slender necks; ninth male sternum 2.12 times broader than long, without caudomedian excavation; basystylar apódeme strong; curving forward to join in a flat-topped basal arch; aedeagus T-shaped.