The preimaginal stages of Cryptotylus unicolor (Wiedemann) and Tabanus nebulosus ornativentris Kroeber (Tabanidae-Diptera-Insecta).

The female pupa was the only known preimaginal stage of Cryptotylus unicolor (Coscarón & Poi de Neiff 1996). From larvae collected on Pistia stratiotes (repollito de agua) in lagoons of Chaco geographic area, we obtained mature larvae, pupae and imagoes of both sexes of C. unicolor. From the same place we collected another larva that changed to the pupa stage in the laboratory, emerging finally as a female corresponding to Tabanus nebulosus ornativentris. This taxon was considered a subspecies due to morphological and tinctorial differences with the typical T. nebulosus DeGeer that has a northern distribution (from Belize to Surinam and Mato Grosso). The subspecies ornativentris is restricted to the Chaco area in Paraguay, Bolivia and northern Argentina. The pupa of T. nebulosus described by Goodwin and Murdoch (1974), originated from Panama in the typical area of nebulosus s. str. is found. Because the pupae collected by us showed some differences from the pupa collected in Panama we include here a description of the pupa of T. n. ornatriventris as well as the previously unknown larva.