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Hi Zeegers (and all) Carrion feeding (sarcosaprophagous)Diptera also vary in size often dramatically. I just had a series of Lucilia sericata (Calliphoridae) from a single (Istanbul) trap varying in length from a tiny 3mm. to 8mm. This may be due to either larva being underfed on small fragments of food or in intense competition in a larval mass. In such masses the temperature can be very high. I also remember reading a paper on bred Tachinidae in which it was claimed the chaetotaxy of the emergent individuals varied with size. Robert