We report on the bionomics and morphology of the immature stages of Paralucilia paraensis (Mello) (Diptera: Calliphoridae). Observations were made on a daily basis for 10 h (from 8 a.m. to 6 p.m.) on a 45-kg pig (Sus scrofa) whose carcass had been partially submerged in a stream of water on the 21st of November 2009, in a forested area of Manaus, Amazonas, Brazil. The collected specimens were placed in plastic vials and transferred to a growth chamber maintained at room temperature. Adults of P. paraensis were collected on the carcass between the 3rd and the 18th days. A total of 13 gravid females were captured; from these, 1,240 eggs were obtained and yielded 1,030 larvae that developed into 879 adults. The average time required for hatching was 13 h. On average, the larvae reached the second instar within 13 h, third instar within 18 h, and pupae within 46 h. The pupal stage lasted 96 h. The complete development time was 216 h. This is the first report on the development time and morphology of immature stages of P. paraensis in forested areas. Therefore, these results provided information for the implementation of future forensic studies in the state of Amazonas.

Blow flies (Calliphoridae) are used in forensic entomology studies, because their life cycle help to determine the minimum post-mortem interval (PMImin). Paralucilia fulvinota (Bigot, 1877) is a forensic indicator and is reported from human corpses in the Amazonian region. Our objectives were to describe the development time of P. fulvinota under natural conditions at Ducke Reserve (Amazonas), provide the accumulated degree-days (ADD) and accumulated degree-hour (ADH), body length and mass of larvae, and the sex ratio of adults. Pregnant females were sampled on a swine carcass. From hatched eggs, we reared stock colonies and observed the immature development under uncontrolled conditions of temperature (24.5 ± 1.3 ºC), rainfall (188 ± 11.5 mm³) and humidity (84 ± 3.9%). Development time was 11 days. Adult sex ratio was 0.86. Larvae gained mass at constant rates through the instars but grew less in length from the second to the third instar. Accordingly, P. fulvinota grows more in mass than in length when in larval stage. The period from first stadium to adults lasted 159.5 degree-days and 3828 degree-hours. Our results may be helpful in providing a more accurate estimate of PMImin on corpses encountered in forested areas of the Amazon region.