Tyrpophloeus populi is a species of bark beetle[2][3] that have been suggested as the cause of sudden aspen decline.

[4][5][6] It was first described by the American entomologist Andrew Delmar Hopkins.

[7] Bark beetles have been reported to have lengths ranging from 1.7 to 2.1 millimeters, with their length approximately 2.3 times as long as they are wide.

[7] They come in black and dark brown body colors.

Tyrpophloeus populi has been found throughout North America, from East Nevada and North Arizona to Saskatchewan and New Brunswick.