Research was conducted on the life length of adult Lyctus brunneus Steph. beetles [Coleoptera: Bostrichidae; Lyctinae] under laboratory conditions with air relative humidity in the range 25-30% and above 90%. Both tested groups of adults were kept at a temperature of 23 ±1°C. The average life length of adult insects was 6.2 days in dry air conditions and 18.1 days in humid air conditions. The difference of 11.9 days is statistically significant. Apart from the statistically significant impact of air relative humidity on the life length of adults, the impact of another factor was detected. It may be assumed that parasites played an important role, also causing a reduction in the body length of adults of L. brunneus.
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