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Insects colonizing human or animal cadavers may be used to estimate post-mortem interval (PMI) usually by aging larvae or pupae sampled on a crime scene. The accuracy of insect age estimates in a forensic context is reduced by large intraspecific variation in insect development time. Here we test the concept that insect size at emergence may be used to predict insect physiological age and accordingly to improve the accuracy of age estimates in forensic entomology. Using results of laboratory study on development of forensically-useful beetle  Creophilus maxillosus  (Linnaeus, 1758) (Staphylinidae) we demonstrate that its physiological age at emergence [i.e. thermal summation value ( K ) needed for emergence] fall with an increase of beetle size. In the validation study it was found that  K  estimated based on the adult insect size was significantly closer to the true  K  as compared to  K  from the general thermal summation model. Using beetle length at emergence as a predictor variable and male or female specific model regressing  K  against beetle length gave the most accurate predictions of age. These results demonstrate that size of  C. maxillosus  at emergence improves accuracy of age estimates in a forensic context.

Size at emergence improves accuracy of age estimates in forensically-useful beetle Creophilus maxillosus L. (Staphylinidae)