Couri and Barros (2010) attempted to identify eggs found in some muscid hosts by removing these from impaled pinned adults, but were unsuccessful, given that available information in the literature was insufficient and the key for identifying eggs (Smith 1967) only partial.
A brief discussion of the speculation on the association between muscid flies, Stylogaster and army ants was provided by Couri and Pont (2006).
As most of the muscid specimens attacked are females (72.6 %) (Couri and Barros 2010) and represent species attracted to faeces, it has been suggested that Stylogaster spp.
In order to describe the assemblage of saprophagous muscids in the gradient studied, the number of dates on which different species were present in samples (frequency), and total individuals caught per species (abundance) were estimated.
A first approach to describe the associations of different species of saprophagous muscids with the different combinations of bait types, sites and microhabitats was obtained by using Correspondence Analysis (CA).
The spatial distribution of saprophagous muscids was analyzed along the urban-rural gradient by using two different methods.
In our work, the curves of the assemblage of saprophagous muscids seemed to reach asymptotic values, thus indicating good representativeness of samples.
The differences in evenness observed along the three sites may reflect the sensitivity of saprophagous muscids to changes in the environment.
The total richness of the assemblage of saprophagous muscids of Buenos Aires (r = 20) was similar to that obtained in subtropical environment (r = 19 in Linhares 1981; r = 27 in Carvalho et al.
Conversely, the abundance of saprophagous muscids was higher in the rural site and decreased towards the urban core.
In the analysis of gradients of urbanization, we found saprophagous muscids in all the environments studied, but their distribution within the three sites differed between species.
Several studies have analyzed the use of certain resources such as breeding substrate or food source (organic matter decomposition) by saprophagous muscids (D'Almeida and Almeida 1998; Kriiger et al.