Mealworm Tenebrio molitor
Adult beetle on wheat grains.
Size: 10-15mm
Shape: Oval
Colour: Very dark brown or black
Antennae: Medium with a loose club
Distinguishing features: Live beetles are slow moving
Larvae are pests of: Old cereals but are also found in birds' nests
These are not museum pests
Often found: From birds' nests and disused chimney flues, particularly in late spring/early summer
Size: 10-15mm
Shape: Oval
Colour: Very dark brown or black
Antennae: Medium with a loose club
Distinguishing features: Live beetles are slow moving
Larvae are pests of: Old cereals but are also found in birds' nests
These are not museum pests
Often found: From birds' nests and disused chimney flues, particularly in late spring/early summer
![](imageresize.php?file=data/usercontent/de3d01c5ce1579df00a44f386d730dd6319af05333ad4cca2c5deeae69b82fb0.jpg&opts=w800h800e0)
![](imageresize.php?file=data/usercontent/de3d01c5ce1579df00a44f386d730dd6319af05333ad4cca2c5deeae69b82fb0.jpg&opts=w200h200e0)
![Tenebrio molitor adult Tenebrio molitor adult](imageresize.php?file=data/usercontent/1613c328317facc0ea30ee46025a6091c160f13b37e517af3b44643e0ae36b7b.jpg&opts=w800h800)
Mealworm Tenebrio molitor
100%
![](imageresize.php?file=data/usercontent/de3d01c5ce1579df00a44f386d730dd6319af05333ad4cca2c5deeae69b82fb0.jpg&opts=w200h200)
![Tenebrio molitor adult Tenebrio molitor adult](imageresize.php?file=data/usercontent/1613c328317facc0ea30ee46025a6091c160f13b37e517af3b44643e0ae36b7b.jpg&opts=w200h200)