The black soldier ßy, Hermetia illucens L., was reared on a grain-based diet at 27, 30,
and 36C. Survival of 4- to 6-d-old larvae to adults averaged 74 Ð97% at 27 and 30C but was only 0.1%
at 36C. Flies required a mean of 4 d (11%) longer to complete larval and pupal development at 27C
than at 30C. At 27 and 30C, females weighed an average of 17Ð19% more than males but required
an average of 0.6 Ð 0.8 d (3.0 Ð 4.3%)longer to completelarval development. At both temperatures, adult
females lived an average of 3.5 d less than adult males. The duration of larval development was a
signiÞcant predictor of adult longevity. Temperature differences of even 3C produce signiÞcant
Þtness tradeoffs for males and females, inßuencing life history attributes and having practical applications
for forensic entomology.