roldani Spinelli & Wirth, 1981: 187 (larva, pupa, male, female). Type locality: Argentina, Buenos Aires, laguna Chascomús, 35°37'0.03"S, 58° 2'6.26"W. HT F (MLPA). Distr.- Argentina (Entre Ríos: Chajarí, 30°43'42.11"S, 57°52'39.32"W. Buenos Aires: type locality; Escobar, 34°18'3.95"S, 58°45'46.70"W; Berisso, Los Talas, 34°52'16.47''S, 57°51'8.76''W). Refs.: Spinelli & Wirth, 1981: 187; Spinelli & Wirth, 1989b: 769; Ronderos et al., 2007: 22.
NEW RECORD:
Buenos Aires: San Nicolás, 33°19'56.49"S, 60°12'16.64"W.
The fourth instar larva and pupa of Bezzia roldani Spinelli & Wirth is redescribed and illustrated by using phase-contrast microscopy and scanning electron microscopy. Immatures were collected by placing floating hydrophytes of the genera Lemna, Wolffia, Wolfiella and Spirodella in Berlesse funnels. The hydrophytes were collected in the Chascomús and Los Talas ponds, both in the province of Buenos Aires, Argentina. The larva show features typical to carnivorous larvae, and it is compared with that of B. nobilis (Winnertz) and with a similar species of the genus Palpomyia Meigen, P. guarani Lane. The pupa is compared with its similar congener B. blantoni Spinelli & Wirth.
Diagnosis: